/**
* Represents an OpenGL texture object. Contains convenience routines for enabling/disabling OpenGL
* texture state, binding this texture, and computing texture coordinates for both the entire image
* as well as a sub-image.
*
* <p><a name="nonpow2"><b>Non-power-of-two restrictions</b></a> <br>
* When creating an OpenGL texture object, the Texture class will attempt to leverage the <a
* href="http://www.opengl.org/registry/specs/ARB/texture_non_power_of_two.txt">GL_ARB_texture_non_power_of_two</a>
* and <a
* href="http://www.opengl.org/registry/specs/ARB/texture_rectangle.txt">GL_ARB_texture_rectangle</a>
* extensions (in that order) whenever possible. If neither extension is available, the Texture
* class will simply upload a non-pow2-sized image into a standard pow2-sized texture (without any
* special scaling). Since the choice of extension (or whether one is used at all) depends on the
* user's machine configuration, developers are recommended to use {@link #getImageTexCoords} and
* {@link #getSubImageTexCoords}, as those methods will calculate the appropriate texture
* coordinates for the situation.
*
* <p>One caveat in this approach is that certain texture wrap modes (e.g. <code>GL_REPEAT</code>)
* are not legal when the GL_ARB_texture_rectangle extension is in use. Another issue to be aware of
* is that in the default pow2 scenario, if the original image does not have pow2 dimensions, then
* wrapping may not work as one might expect since the image does not extend to the edges of the
* pow2 texture. If texture wrapping is important, it is recommended to use only pow2-sized images
* with the Texture class.
*
* <p><a name="perftips"><b>Performance Tips</b></a> <br>
* For best performance, try to avoid calling {@link #enable} / {@link #bind} / {@link #disable} any
* more than necessary. For example, applications using many Texture objects in the same scene may
* want to reduce the number of calls to both {@link #enable} and {@link #disable}. To do this it is
* necessary to call {@link #getTarget} to make sure the OpenGL texture target is the same for all
* of the Texture objects in use; non-power-of-two textures using the GL_ARB_texture_rectangle
* extension use a different target than power-of-two textures using the GL_TEXTURE_2D target. Note
* that when switching between textures it is necessary to call {@link #bind}, but when drawing many
* triangles all using the same texture, for best performance only one call to {@link #bind} should
* be made.
*
* <p><a name="premult"><b>Alpha premultiplication and blending</b></a> <br>
* The mathematically correct way to perform blending in OpenGL (with the SrcOver "source over
* destination" mode, or any other Porter-Duff rule) is to use "premultiplied color components",
* which means the R/G/ B color components have already been multiplied by the alpha value. To make
* things easier for developers, the Texture class will automatically convert non-premultiplied
* image data into premultiplied data when storing it into an OpenGL texture. As a result, it is
* important to use the correct blending function; for example, the SrcOver rule is expressed as:
*
* <pre>
* gl.glBlendFunc(GL.GL_ONE, GL.GL_ONE_MINUS_SRC_ALPHA);
* </pre>
*
* Also, when using a texture function like <code>GL_MODULATE</code> where the current color plays a
* role, it is important to remember to make sure that the color is specified in a premultiplied
* form, for example:
*
* <pre>
* float a = ...;
* float r = r * a;
* float g = g * a;
* float b = b * a;
* gl.glColor4f(r, g, b, a);
* </pre>
*
* For reference, here is a list of the Porter-Duff compositing rules and the associated OpenGL
* blend functions (source and destination factors) to use in the face of premultiplied alpha:
*
* <p><CENTER>
*
* <TABLE WIDTH="75%">
* <TR> <TD> Rule <TD> Source <TD> Dest
* <TR> <TD> Clear <TD> GL_ZERO <TD> GL_ZERO
* <TR> <TD> Src <TD> GL_ONE <TD> GL_ZERO
* <TR> <TD> SrcOver <TD> GL_ONE <TD> GL_ONE_MINUS_SRC_ALPHA
* <TR> <TD> DstOver <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ONE
* <TR> <TD> SrcIn <TD> GL_DST_ALPHA <TD> GL_ZERO
* <TR> <TD> DstIn <TD> GL_ZERO <TD> GL_SRC_ALPHA
* <TR> <TD> SrcOut <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ZERO
* <TR> <TD> DstOut <TD> GL_ZERO <TD> GL_ONE_MINUS_SRC_ALPHA
* <TR> <TD> Dst <TD> GL_ZERO <TD> GL_ONE
* <TR> <TD> SrcAtop <TD> GL_DST_ALPHA <TD> GL_ONE_MINUS_SRC_ALPHA
* <TR> <TD> DstAtop <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_SRC_ALPHA
* <TR> <TD> AlphaXor <TD> GL_ONE_MINUS_DST_ALPHA <TD> GL_ONE_MINUS_SRC_ALPHA
* </TABLE>
*
* </CENTER>
*
* @author Chris Campbell
* @author Kenneth Russell
*/
public class Texture {
/** The GL target type. */
private int target;
/** The GL texture ID. */
private int texID;
/** The width of the texture. */
private int texWidth;
/** The height of the texture. */
private int texHeight;
/** The width of the image. */
private int imgWidth;
/** The height of the image. */
private int imgHeight;
/**
* The original aspect ratio of the image, before any rescaling that might have occurred due to
* using the GLU mipmap routines.
*/
private float aspectRatio;
/** Indicates whether the TextureData requires a vertical flip of the texture coords. */
private boolean mustFlipVertically;
/** Indicates whether we're using automatic mipmap generation support (GL_GENERATE_MIPMAP). */
private boolean usingAutoMipmapGeneration;
/** The texture coordinates corresponding to the entire image. */
private TextureCoords coords;
/** An estimate of the amount of texture memory this texture consumes. */
private int estimatedMemorySize;
private static final boolean DEBUG = Debug.debug("Texture");
private static final boolean VERBOSE = Debug.verbose();
// For testing alternate code paths on more capable hardware
private static final boolean disableNPOT = Debug.isPropertyDefined("jogl.texture.nonpot");
private static final boolean disableTexRect = Debug.isPropertyDefined("jogl.texture.notexrect");
// For now make Texture constructor package-private to limit the
// number of public APIs we commit to
Texture(TextureData data) throws GLException {
GL gl = GLU.getCurrentGL();
texID = createTextureID(gl);
updateImage(data);
}
// Constructor for use when creating e.g. cube maps, where there is
// no initial texture data
Texture(int target) throws GLException {
GL gl = GLU.getCurrentGL();
texID = createTextureID(gl);
this.target = target;
}
/**
* Enables this texture's target (e.g., GL_TEXTURE_2D) in the current GL context's state. This
* method is a shorthand equivalent of the following OpenGL code:
*
* <pre>
* gl.glEnable(texture.getTarget());
* </pre>
*
* See the <a href="#perftips">performance tips</a> above for hints on how to maximize performance
* when using many Texture objects.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void enable() throws GLException {
GLU.getCurrentGL().glEnable(target);
}
/**
* Disables this texture's target (e.g., GL_TEXTURE_2D) in the current GL context's state. This
* method is a shorthand equivalent of the following OpenGL code:
*
* <pre>
* gl.glDisable(texture.getTarget());
* </pre>
*
* See the <a href="#perftips">performance tips</a> above for hints on how to maximize performance
* when using many Texture objects.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void disable() throws GLException {
GLU.getCurrentGL().glDisable(target);
}
/**
* Binds this texture to the current GL context. This method is a shorthand equivalent of the
* following OpenGL code:
*
* <pre>
* gl.glBindTexture(texture.getTarget(), texture.getTextureObject());
* </pre>
*
* See the <a href="#perftips">performance tips</a> above for hints on how to maximize performance
* when using many Texture objects.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void bind() throws GLException {
GLU.getCurrentGL().glBindTexture(target, texID);
}
/**
* Disposes the native resources used by this texture object.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void dispose() throws GLException {
GLU.getCurrentGL().glDeleteTextures(1, new int[] {texID}, 0);
texID = 0;
}
/**
* Returns the OpenGL "target" of this texture.
*
* @return the OpenGL target of this texture
* @see javax.media.opengl.GL#GL_TEXTURE_2D
* @see javax.media.opengl.GL#GL_TEXTURE_RECTANGLE_ARB
*/
public int getTarget() {
return target;
}
/**
* Returns the width of the allocated OpenGL texture in pixels. Note that the texture width will
* be greater than or equal to the width of the image contained within.
*
* @return the width of the texture
*/
public int getWidth() {
return texWidth;
}
/**
* Returns the height of the allocated OpenGL texture in pixels. Note that the texture height will
* be greater than or equal to the height of the image contained within.
*
* @return the height of the texture
*/
public int getHeight() {
return texHeight;
}
/**
* Returns the width of the image contained within this texture. Note that for non-power-of-two
* textures in particular this may not be equal to the result of {@link #getWidth}. It is
* recommended that applications call {@link #getImageTexCoords} and {@link #getSubImageTexCoords}
* rather than using this API directly.
*
* @return the width of the image
*/
public int getImageWidth() {
return imgWidth;
}
/**
* Returns the height of the image contained within this texture. Note that for non-power-of-two
* textures in particular this may not be equal to the result of {@link #getHeight}. It is
* recommended that applications call {@link #getImageTexCoords} and {@link #getSubImageTexCoords}
* rather than using this API directly.
*
* @return the height of the image
*/
public int getImageHeight() {
return imgHeight;
}
/**
* Returns the original aspect ratio of the image, defined as (image width) / (image height),
* before any scaling that might have occurred as a result of using the GLU mipmap routines.
*/
public float getAspectRatio() {
return aspectRatio;
}
/**
* Returns the set of texture coordinates corresponding to the entire image. If the TextureData
* indicated that the texture coordinates must be flipped vertically, the returned TextureCoords
* will take that into account.
*
* @return the texture coordinates corresponding to the entire image
*/
public TextureCoords getImageTexCoords() {
return coords;
}
/**
* Returns the set of texture coordinates corresponding to the specified sub-image. The (x1, y1)
* and (x2, y2) points are specified in terms of pixels starting from the lower-left of the image.
* (x1, y1) should specify the lower-left corner of the sub-image and (x2, y2) the upper-right
* corner of the sub-image. If the TextureData indicated that the texture coordinates must be
* flipped vertically, the returned TextureCoords will take that into account; this should not be
* handled by the end user in the specification of the y1 and y2 coordinates.
*
* @return the texture coordinates corresponding to the specified sub-image
*/
public TextureCoords getSubImageTexCoords(int x1, int y1, int x2, int y2) {
if (target == GL.GL_TEXTURE_RECTANGLE_ARB) {
if (mustFlipVertically) {
return new TextureCoords(x1, texHeight - y1, x2, texHeight - y2);
} else {
return new TextureCoords(x1, y1, x2, y2);
}
} else {
float tx1 = (float) x1 / (float) texWidth;
float ty1 = (float) y1 / (float) texHeight;
float tx2 = (float) x2 / (float) texWidth;
float ty2 = (float) y2 / (float) texHeight;
if (mustFlipVertically) {
float yMax = (float) imgHeight / (float) texHeight;
return new TextureCoords(tx1, yMax - ty1, tx2, yMax - ty2);
} else {
return new TextureCoords(tx1, ty1, tx2, ty2);
}
}
}
/**
* Updates the entire content area of this texture using the data in the given image.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void updateImage(TextureData data) throws GLException {
updateImage(data, 0);
}
/**
* Indicates whether this texture's texture coordinates must be flipped vertically in order to
* properly display the texture. This is handled automatically by {@link #getImageTexCoords
* getImageTexCoords} and {@link #getSubImageTexCoords getSubImageTexCoords}, but applications may
* generate or otherwise produce texture coordinates which must be corrected.
*/
public boolean getMustFlipVertically() {
return mustFlipVertically;
}
/**
* Updates the content area of the specified target of this texture using the data in the given
* image. In general this is intended for construction of cube maps.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void updateImage(TextureData data, int target) throws GLException {
GL gl = GLU.getCurrentGL();
imgWidth = data.getWidth();
imgHeight = data.getHeight();
aspectRatio = (float) imgWidth / (float) imgHeight;
mustFlipVertically = data.getMustFlipVertically();
int texTarget = 0;
int texParamTarget = this.target;
// See whether we have automatic mipmap generation support
boolean haveAutoMipmapGeneration =
(gl.isExtensionAvailable("GL_VERSION_1_4")
|| gl.isExtensionAvailable("GL_SGIS_generate_mipmap"));
// Indicate to the TextureData what functionality is available
data.setHaveEXTABGR(gl.isExtensionAvailable("GL_EXT_abgr"));
data.setHaveGL12(gl.isExtensionAvailable("GL_VERSION_1_2"));
// Note that automatic mipmap generation doesn't work for
// GL_ARB_texture_rectangle
if ((!isPowerOfTwo(imgWidth) || !isPowerOfTwo(imgHeight)) && !haveNPOT(gl)) {
haveAutoMipmapGeneration = false;
}
boolean expandingCompressedTexture = false;
if (data.getMipmap() && !haveAutoMipmapGeneration) {
// GLU always scales the texture's dimensions to be powers of
// two. It also doesn't really matter exactly what the texture
// width and height are because the texture coords are always
// between 0.0 and 1.0.
imgWidth = nextPowerOfTwo(imgWidth);
imgHeight = nextPowerOfTwo(imgHeight);
texWidth = imgWidth;
texHeight = imgHeight;
texTarget = GL.GL_TEXTURE_2D;
} else if ((isPowerOfTwo(imgWidth) && isPowerOfTwo(imgHeight)) || haveNPOT(gl)) {
if (DEBUG) {
if (isPowerOfTwo(imgWidth) && isPowerOfTwo(imgHeight)) {
System.err.println("Power-of-two texture");
} else {
System.err.println("Using GL_ARB_texture_non_power_of_two");
}
}
texWidth = imgWidth;
texHeight = imgHeight;
texTarget = GL.GL_TEXTURE_2D;
} else if (haveTexRect(gl) && !data.isDataCompressed()) {
// GL_ARB_texture_rectangle does not work for compressed textures
if (DEBUG) {
System.err.println("Using GL_ARB_texture_rectangle");
}
texWidth = imgWidth;
texHeight = imgHeight;
texTarget = GL.GL_TEXTURE_RECTANGLE_ARB;
} else {
// If we receive non-power-of-two compressed texture data and
// don't have true hardware support for compressed textures, we
// can fake this support by producing an empty "compressed"
// texture image, using glCompressedTexImage2D with that to
// allocate the texture, and glCompressedTexSubImage2D with the
// incoming data.
if (data.isDataCompressed()) {
if (data.getMipmapData() != null) {
// We don't currently support expanding of compressed,
// mipmapped non-power-of-two textures to the nearest power
// of two; the obvious port of the non-mipmapped code didn't
// work
throw new GLException(
"Mipmapped non-power-of-two compressed textures only supported on OpenGL 2.0 hardware (GL_ARB_texture_non_power_of_two)");
}
expandingCompressedTexture = true;
}
if (DEBUG) {
System.err.println("Expanding texture to power-of-two dimensions");
}
if (data.getBorder() != 0) {
throw new RuntimeException(
"Scaling up a non-power-of-two texture which has a border won't work");
}
texWidth = nextPowerOfTwo(imgWidth);
texHeight = nextPowerOfTwo(imgHeight);
texTarget = GL.GL_TEXTURE_2D;
}
texParamTarget = texTarget;
setImageSize(imgWidth, imgHeight, texTarget);
if (target != 0) {
// Allow user to override auto detection and skip bind step (for
// cubemap construction)
texTarget = target;
if (this.target == 0) {
throw new GLException("Override of target failed; no target specified yet");
}
texParamTarget = this.target;
gl.glBindTexture(texParamTarget, texID);
} else {
gl.glBindTexture(texTarget, texID);
}
if (data.getMipmap() && !haveAutoMipmapGeneration) {
int[] align = new int[1];
gl.glGetIntegerv(GL.GL_UNPACK_ALIGNMENT, align, 0); // save alignment
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, data.getAlignment());
if (data.isDataCompressed()) {
throw new GLException("May not request mipmap generation for compressed textures");
}
try {
GLU glu = new GLU();
glu.gluBuild2DMipmaps(
texTarget,
data.getInternalFormat(),
data.getWidth(),
data.getHeight(),
data.getPixelFormat(),
data.getPixelType(),
data.getBuffer());
} finally {
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, align[0]); // restore alignment
}
} else {
checkCompressedTextureExtensions(data);
Buffer[] mipmapData = data.getMipmapData();
if (mipmapData != null) {
int width = texWidth;
int height = texHeight;
for (int i = 0; i < mipmapData.length; i++) {
if (data.isDataCompressed()) {
// Need to use glCompressedTexImage2D directly to allocate and fill this image
// Avoid spurious memory allocation when possible
gl.glCompressedTexImage2D(
texTarget,
i,
data.getInternalFormat(),
width,
height,
data.getBorder(),
mipmapData[i].remaining(),
mipmapData[i]);
} else {
// Allocate texture image at this level
gl.glTexImage2D(
texTarget,
i,
data.getInternalFormat(),
width,
height,
data.getBorder(),
data.getPixelFormat(),
data.getPixelType(),
null);
updateSubImageImpl(data, texTarget, i, 0, 0, 0, 0, data.getWidth(), data.getHeight());
}
width = Math.max(width / 2, 1);
height = Math.max(height / 2, 1);
}
} else {
if (data.isDataCompressed()) {
if (!expandingCompressedTexture) {
// Need to use glCompressedTexImage2D directly to allocate and fill this image
// Avoid spurious memory allocation when possible
gl.glCompressedTexImage2D(
texTarget,
0,
data.getInternalFormat(),
texWidth,
texHeight,
data.getBorder(),
data.getBuffer().capacity(),
data.getBuffer());
} else {
ByteBuffer buf =
DDSImage.allocateBlankBuffer(texWidth, texHeight, data.getInternalFormat());
gl.glCompressedTexImage2D(
texTarget,
0,
data.getInternalFormat(),
texWidth,
texHeight,
data.getBorder(),
buf.capacity(),
buf);
updateSubImageImpl(data, texTarget, 0, 0, 0, 0, 0, data.getWidth(), data.getHeight());
}
} else {
if (data.getMipmap() && haveAutoMipmapGeneration) {
// For now, only use hardware mipmapping for uncompressed 2D
// textures where the user hasn't explicitly specified
// mipmap data; don't know about interactions between
// GL_GENERATE_MIPMAP and glCompressedTexImage2D
gl.glTexParameteri(texParamTarget, GL.GL_GENERATE_MIPMAP, GL.GL_TRUE);
usingAutoMipmapGeneration = true;
}
gl.glTexImage2D(
texTarget,
0,
data.getInternalFormat(),
texWidth,
texHeight,
data.getBorder(),
data.getPixelFormat(),
data.getPixelType(),
null);
updateSubImageImpl(data, texTarget, 0, 0, 0, 0, 0, data.getWidth(), data.getHeight());
}
}
}
int minFilter = (data.getMipmap() ? GL.GL_LINEAR_MIPMAP_LINEAR : GL.GL_LINEAR);
int magFilter = GL.GL_LINEAR;
int wrapMode = (gl.isExtensionAvailable("GL_VERSION_1_2") ? GL.GL_CLAMP_TO_EDGE : GL.GL_CLAMP);
// REMIND: figure out what to do for GL_TEXTURE_RECTANGLE_ARB
if (texTarget != GL.GL_TEXTURE_RECTANGLE_ARB) {
gl.glTexParameteri(texParamTarget, GL.GL_TEXTURE_MIN_FILTER, minFilter);
gl.glTexParameteri(texParamTarget, GL.GL_TEXTURE_MAG_FILTER, magFilter);
gl.glTexParameteri(texParamTarget, GL.GL_TEXTURE_WRAP_S, wrapMode);
gl.glTexParameteri(texParamTarget, GL.GL_TEXTURE_WRAP_T, wrapMode);
if (this.target == GL.GL_TEXTURE_CUBE_MAP) {
gl.glTexParameteri(texParamTarget, GL.GL_TEXTURE_WRAP_R, wrapMode);
}
}
// Don't overwrite target if we're loading e.g. faces of a cube
// map
if ((this.target == 0)
|| (this.target == GL.GL_TEXTURE_2D)
|| (this.target == GL.GL_TEXTURE_RECTANGLE_ARB)) {
this.target = texTarget;
}
// This estimate will be wrong for cube maps
estimatedMemorySize = data.getEstimatedMemorySize();
}
/**
* Updates a subregion of the content area of this texture using the given data. If automatic
* mipmap generation is in use (see {@link #isUsingAutoMipmapGeneration
* isUsingAutoMipmapGeneration}), updates to the base (level 0) mipmap will cause the lower-level
* mipmaps to be regenerated, and updates to other mipmap levels will be ignored. Otherwise, if
* automatic mipmap generation is not in use, only updates the specified mipmap level and does not
* re-generate mipmaps if they were originally produced or loaded.
*
* @param data the image data to be uploaded to this texture
* @param mipmapLevel the mipmap level of the texture to set. If this is non-zero and the
* TextureData contains mipmap data, the appropriate mipmap level will be selected.
* @param x the x offset (in pixels) relative to the lower-left corner of this texture
* @param y the y offset (in pixels) relative to the lower-left corner of this texture
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void updateSubImage(TextureData data, int mipmapLevel, int x, int y) throws GLException {
if (usingAutoMipmapGeneration && mipmapLevel != 0) {
// When we're using mipmap generation via GL_GENERATE_MIPMAP, we
// don't need to update other mipmap levels
return;
}
bind();
updateSubImageImpl(data, target, mipmapLevel, x, y, 0, 0, data.getWidth(), data.getHeight());
}
/**
* Updates a subregion of the content area of this texture using the specified sub-region of the
* given data. If automatic mipmap generation is in use (see {@link #isUsingAutoMipmapGeneration
* isUsingAutoMipmapGeneration}), updates to the base (level 0) mipmap will cause the lower-level
* mipmaps to be regenerated, and updates to other mipmap levels will be ignored. Otherwise, if
* automatic mipmap generation is not in use, only updates the specified mipmap level and does not
* re-generate mipmaps if they were originally produced or loaded. This method is only supported
* for uncompressed TextureData sources.
*
* @param data the image data to be uploaded to this texture
* @param mipmapLevel the mipmap level of the texture to set. If this is non-zero and the
* TextureData contains mipmap data, the appropriate mipmap level will be selected.
* @param dstx the x offset (in pixels) relative to the lower-left corner of this texture where
* the update will be applied
* @param dsty the y offset (in pixels) relative to the lower-left corner of this texture where
* the update will be applied
* @param srcx the x offset (in pixels) relative to the lower-left corner of the supplied
* TextureData from which to fetch the update rectangle
* @param srcy the y offset (in pixels) relative to the lower-left corner of the supplied
* TextureData from which to fetch the update rectangle
* @param width the width (in pixels) of the rectangle to be updated
* @param height the height (in pixels) of the rectangle to be updated
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void updateSubImage(
TextureData data,
int mipmapLevel,
int dstx,
int dsty,
int srcx,
int srcy,
int width,
int height)
throws GLException {
if (data.isDataCompressed()) {
throw new GLException(
"updateSubImage specifying a sub-rectangle is not supported for compressed TextureData");
}
if (usingAutoMipmapGeneration && mipmapLevel != 0) {
// When we're using mipmap generation via GL_GENERATE_MIPMAP, we
// don't need to update other mipmap levels
return;
}
bind();
updateSubImageImpl(data, target, mipmapLevel, dstx, dsty, srcx, srcy, width, height);
}
/**
* Sets the OpenGL floating-point texture parameter for the texture's target. This gives control
* over parameters such as GL_TEXTURE_MAX_ANISOTROPY_EXT. Causes this texture to be bound to the
* current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameterf(int parameterName, float value) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameterf(target, parameterName, value);
}
/**
* Sets the OpenGL multi-floating-point texture parameter for the texture's target. Causes this
* texture to be bound to the current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameterfv(int parameterName, FloatBuffer params) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameterfv(target, parameterName, params);
}
/**
* Sets the OpenGL multi-floating-point texture parameter for the texture's target. Causes this
* texture to be bound to the current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameterfv(int parameterName, float[] params, int params_offset) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameterfv(target, parameterName, params, params_offset);
}
/**
* Sets the OpenGL integer texture parameter for the texture's target. This gives control over
* parameters such as GL_TEXTURE_WRAP_S and GL_TEXTURE_WRAP_T, which by default are set to
* GL_CLAMP_TO_EDGE if OpenGL 1.2 is supported on the current platform and GL_CLAMP if not. Causes
* this texture to be bound to the current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameteri(int parameterName, int value) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameteri(target, parameterName, value);
}
/**
* Sets the OpenGL multi-integer texture parameter for the texture's target. Causes this texture
* to be bound to the current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameteriv(int parameterName, IntBuffer params) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameteriv(target, parameterName, params);
}
/**
* Sets the OpenGL multi-integer texture parameter for the texture's target. Causes this texture
* to be bound to the current texture state.
*
* @throws GLException if no OpenGL context was current or if any OpenGL-related errors occurred
*/
public void setTexParameteriv(int parameterName, int[] params, int params_offset) {
bind();
GL gl = GLU.getCurrentGL();
gl.glTexParameteriv(target, parameterName, params, params_offset);
}
/**
* Returns the underlying OpenGL texture object for this texture. Most applications will not need
* to access this, since it is handled automatically by the bind() and dispose() APIs.
*/
public int getTextureObject() {
return texID;
}
/**
* Returns an estimate of the amount of texture memory in bytes this Texture consumes. It should
* only be treated as an estimate; most applications should not need to query this but instead let
* the OpenGL implementation page textures in and out as necessary.
*/
public int getEstimatedMemorySize() {
return estimatedMemorySize;
}
/**
* Indicates whether this Texture is using automatic mipmap generation (via the OpenGL texture
* parameter GL_GENERATE_MIPMAP). This will automatically be used when mipmapping is requested via
* the TextureData and either OpenGL 1.4 or the GL_SGIS_generate_mipmap extension is available. If
* so, updates to the base image (mipmap level 0) will automatically propagate down to the lower
* mipmap levels. Manual updates of the mipmap data at these lower levels will be ignored.
*/
public boolean isUsingAutoMipmapGeneration() {
return usingAutoMipmapGeneration;
}
// ----------------------------------------------------------------------
// Internals only below this point
//
/**
* Returns true if the given value is a power of two.
*
* @return true if the given value is a power of two, false otherwise
*/
private static boolean isPowerOfTwo(int val) {
return ((val & (val - 1)) == 0);
}
/**
* Returns the nearest power of two that is larger than the given value. If the given value is
* already a power of two, this method will simply return that value.
*
* @param val the value
* @return the next power of two
*/
private static int nextPowerOfTwo(int val) {
int ret = 1;
while (ret < val) {
ret <<= 1;
}
return ret;
}
/** Updates the actual image dimensions; usually only called from <code>updateImage</code>. */
private void setImageSize(int width, int height, int target) {
imgWidth = width;
imgHeight = height;
if (target == GL.GL_TEXTURE_RECTANGLE_ARB) {
if (mustFlipVertically) {
coords = new TextureCoords(0, imgHeight, imgWidth, 0);
} else {
coords = new TextureCoords(0, 0, imgWidth, imgHeight);
}
} else {
if (mustFlipVertically) {
coords =
new TextureCoords(
0, (float) imgHeight / (float) texHeight, (float) imgWidth / (float) texWidth, 0);
} else {
coords =
new TextureCoords(
0, 0, (float) imgWidth / (float) texWidth, (float) imgHeight / (float) texHeight);
}
}
}
private void updateSubImageImpl(
TextureData data,
int newTarget,
int mipmapLevel,
int dstx,
int dsty,
int srcx,
int srcy,
int width,
int height)
throws GLException {
GL gl = GLU.getCurrentGL();
data.setHaveEXTABGR(gl.isExtensionAvailable("GL_EXT_abgr"));
data.setHaveGL12(gl.isExtensionAvailable("GL_VERSION_1_2"));
Buffer buffer = data.getBuffer();
if (buffer == null && data.getMipmapData() == null) {
// Assume user just wanted to get the Texture object allocated
return;
}
int rowlen = data.getRowLength();
int dataWidth = data.getWidth();
int dataHeight = data.getHeight();
if (data.getMipmapData() != null) {
// Compute the width, height and row length at the specified mipmap level
// Note we do not support specification of the row length for
// mipmapped textures at this point
for (int i = 0; i < mipmapLevel; i++) {
width = Math.max(width / 2, 1);
height = Math.max(height / 2, 1);
dataWidth = Math.max(dataWidth / 2, 1);
dataHeight = Math.max(dataHeight / 2, 1);
}
rowlen = 0;
buffer = data.getMipmapData()[mipmapLevel];
}
// Clip incoming rectangles to what is available both on this
// texture and in the incoming TextureData
if (srcx < 0) {
width += srcx;
srcx = 0;
}
if (srcy < 0) {
height += srcy;
srcy = 0;
}
// NOTE: not sure whether the following two are the correct thing to do
if (dstx < 0) {
width += dstx;
dstx = 0;
}
if (dsty < 0) {
height += dsty;
dsty = 0;
}
if (srcx + width > dataWidth) {
width = dataWidth - srcx;
}
if (srcy + height > dataHeight) {
height = dataHeight - srcy;
}
if (dstx + width > texWidth) {
width = texWidth - dstx;
}
if (dsty + height > texHeight) {
height = texHeight - dsty;
}
checkCompressedTextureExtensions(data);
if (data.isDataCompressed()) {
gl.glCompressedTexSubImage2D(
newTarget,
mipmapLevel,
dstx,
dsty,
width,
height,
data.getInternalFormat(),
buffer.remaining(),
buffer);
} else {
int[] align = new int[1];
int[] rowLength = new int[1];
int[] skipRows = new int[1];
int[] skipPixels = new int[1];
gl.glGetIntegerv(GL.GL_UNPACK_ALIGNMENT, align, 0); // save alignment
gl.glGetIntegerv(GL.GL_UNPACK_ROW_LENGTH, rowLength, 0); // save row length
gl.glGetIntegerv(GL.GL_UNPACK_SKIP_ROWS, skipRows, 0); // save skipped rows
gl.glGetIntegerv(GL.GL_UNPACK_SKIP_PIXELS, skipPixels, 0); // save skipped pixels
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, data.getAlignment());
if (DEBUG && VERBOSE) {
System.out.println("Row length = " + rowlen);
System.out.println("skip pixels = " + srcx);
System.out.println("skip rows = " + srcy);
System.out.println("dstx = " + dstx);
System.out.println("dsty = " + dsty);
System.out.println("width = " + width);
System.out.println("height = " + height);
}
gl.glPixelStorei(GL.GL_UNPACK_ROW_LENGTH, rowlen);
gl.glPixelStorei(GL.GL_UNPACK_SKIP_ROWS, srcy);
gl.glPixelStorei(GL.GL_UNPACK_SKIP_PIXELS, srcx);
gl.glTexSubImage2D(
newTarget,
mipmapLevel,
dstx,
dsty,
width,
height,
data.getPixelFormat(),
data.getPixelType(),
buffer);
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, align[0]); // restore alignment
gl.glPixelStorei(GL.GL_UNPACK_ROW_LENGTH, rowLength[0]); // restore row length
gl.glPixelStorei(GL.GL_UNPACK_SKIP_ROWS, skipRows[0]); // restore skipped rows
gl.glPixelStorei(GL.GL_UNPACK_SKIP_PIXELS, skipPixels[0]); // restore skipped pixels
}
}
private void checkCompressedTextureExtensions(TextureData data) {
GL gl = GLU.getCurrentGL();
if (data.isDataCompressed()) {
switch (data.getInternalFormat()) {
case GL.GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL.GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL.GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL.GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
if (!gl.isExtensionAvailable("GL_EXT_texture_compression_s3tc")
&& !gl.isExtensionAvailable("GL_NV_texture_compression_vtc")) {
throw new GLException("DXTn compressed textures not supported by this graphics card");
}
break;
default:
// FIXME: should test availability of more texture
// compression extensions here
break;
}
}
}
/**
* Creates a new texture ID.
*
* @param gl the GL object associated with the current OpenGL context
* @return a new texture ID
*/
private static int createTextureID(GL gl) {
int[] tmp = new int[1];
gl.glGenTextures(1, tmp, 0);
return tmp[0];
}
// Helper routines for disabling certain codepaths
private static boolean haveNPOT(GL gl) {
return (!disableNPOT && gl.isExtensionAvailable("GL_ARB_texture_non_power_of_two"));
}
private static boolean haveTexRect(GL gl) {
return (!disableTexRect
&& TextureIO.isTexRectEnabled()
&& gl.isExtensionAvailable("GL_ARB_texture_rectangle"));
}
}
public class WindowsOnscreenGLDrawable extends WindowsGLDrawable {
public static final int LOCK_SURFACE_NOT_READY = 1;
public static final int LOCK_SURFACE_CHANGED = 2;
public static final int LOCK_SUCCESS = 3;
protected Component component;
// Variables for lockSurface/unlockSurface
private JAWT_DrawingSurface ds;
private JAWT_DrawingSurfaceInfo dsi;
private JAWT_Win32DrawingSurfaceInfo win32dsi;
// Indicates whether the component (if an onscreen context) has been
// realized. Plausibly, before the component is realized the JAWT
// should return an error or NULL object from some of its
// operations; this appears to be the case on Win32 but is not true
// at least with Sun's current X11 implementation (1.4.x), which
// crashes with no other error reported if the DrawingSurfaceInfo is
// fetched from a locked DrawingSurface during the validation as a
// result of calling show() on the main thread. To work around this
// we prevent any JAWT or OpenGL operations from being done until
// addNotify() is called on the component.
protected boolean realized;
private static final boolean PROFILING = Debug.debug("WindowsOnscreenGLDrawable.profiling");
private static final int PROFILING_TICKS = 200;
private int profilingLockSurfaceTicks;
private long profilingLockSurfaceTime;
private int profilingUnlockSurfaceTicks;
private long profilingUnlockSurfaceTime;
private int profilingSwapBuffersTicks;
private long profilingSwapBuffersTime;
// Workaround for problems on Intel 82855 cards
private int setPixelFormatFailCount;
private static final int MAX_SET_PIXEL_FORMAT_FAIL_COUNT = 5;
public WindowsOnscreenGLDrawable(
Component component, GLCapabilities capabilities, GLCapabilitiesChooser chooser) {
super(capabilities, chooser);
this.component = component;
}
public GLContext createContext(GLContext shareWith) {
return new WindowsOnscreenGLContext(this, shareWith);
}
public void setRealized(boolean realized) {
this.realized = realized;
if (!realized) {
// Assume heavyweight widget was destroyed
setChosenGLCapabilities(null);
pixelFormatChosen = false;
}
}
public void setSize(int width, int height) {
component.setSize(width, height);
}
public int getWidth() {
return component.getWidth();
}
public int getHeight() {
return component.getHeight();
}
public void swapBuffers() throws GLException {
boolean didLock = false;
if (hdc == 0) {
if (lockSurface() == LOCK_SURFACE_NOT_READY) {
return;
}
didLock = true;
}
long startTime = 0;
if (PROFILING) {
startTime = System.currentTimeMillis();
}
if (!WGL.SwapBuffers(hdc) && (WGL.GetLastError() != 0)) {
throw new GLException("Error swapping buffers");
}
if (PROFILING) {
long endTime = System.currentTimeMillis();
profilingSwapBuffersTime += (endTime - startTime);
int ticks = PROFILING_TICKS;
if (++profilingSwapBuffersTicks == ticks) {
System.err.println(
"SwapBuffers calls: "
+ profilingSwapBuffersTime
+ " ms / "
+ ticks
+ " calls ("
+ ((float) profilingSwapBuffersTime / (float) ticks)
+ " ms/call)");
profilingSwapBuffersTime = 0;
profilingSwapBuffersTicks = 0;
}
}
if (didLock) {
unlockSurface();
}
}
public int lockSurface() throws GLException {
if (!realized) {
return LOCK_SURFACE_NOT_READY;
}
if (hdc != 0) {
throw new GLException("Surface already locked");
}
long startTime = 0;
if (PROFILING) {
startTime = System.currentTimeMillis();
}
ds = JAWT.getJAWT().GetDrawingSurface(component);
if (ds == null) {
// Widget not yet realized
return LOCK_SURFACE_NOT_READY;
}
int res = ds.Lock();
if ((res & JAWTFactory.JAWT_LOCK_ERROR) != 0) {
throw new GLException("Unable to lock surface");
}
// See whether the surface changed and if so destroy the old
// OpenGL context so it will be recreated (NOTE: removeNotify
// should handle this case, but it may be possible that race
// conditions can cause this code to be triggered -- should test
// more)
int ret = LOCK_SUCCESS;
if ((res & JAWTFactory.JAWT_LOCK_SURFACE_CHANGED) != 0) {
ret = LOCK_SURFACE_CHANGED;
}
dsi = ds.GetDrawingSurfaceInfo();
if (dsi == null) {
// Widget not yet realized
ds.Unlock();
JAWT.getJAWT().FreeDrawingSurface(ds);
ds = null;
return LOCK_SURFACE_NOT_READY;
}
win32dsi = (JAWT_Win32DrawingSurfaceInfo) dsi.platformInfo();
hdc = win32dsi.hdc();
if (hdc == 0) {
// Widget not yet realized
ds.FreeDrawingSurfaceInfo(dsi);
ds.Unlock();
JAWT.getJAWT().FreeDrawingSurface(ds);
ds = null;
dsi = null;
win32dsi = null;
return LOCK_SURFACE_NOT_READY;
}
if (!pixelFormatChosen) {
try {
choosePixelFormat(true);
setPixelFormatFailCount = 0;
} catch (RuntimeException e) {
// Workaround for problems seen on Intel 82855 cards in particular
// Make it look like the lockSurface() call didn't succeed
unlockSurface();
if (e instanceof GLException) {
if (++setPixelFormatFailCount == MAX_SET_PIXEL_FORMAT_FAIL_COUNT) {
setPixelFormatFailCount = 0;
throw e;
}
return LOCK_SURFACE_NOT_READY;
} else {
// Probably a user error in the GLCapabilitiesChooser or similar.
// Don't propagate non-GLExceptions out because calling code
// expects to catch only that exception type
throw new GLException(e);
}
}
}
if (PROFILING) {
long endTime = System.currentTimeMillis();
profilingLockSurfaceTime += (endTime - startTime);
int ticks = PROFILING_TICKS;
if (++profilingLockSurfaceTicks == ticks) {
System.err.println(
"LockSurface calls: "
+ profilingLockSurfaceTime
+ " ms / "
+ ticks
+ " calls ("
+ ((float) profilingLockSurfaceTime / (float) ticks)
+ " ms/call)");
profilingLockSurfaceTime = 0;
profilingLockSurfaceTicks = 0;
}
}
return ret;
}
public void unlockSurface() {
if (hdc == 0) {
throw new GLException("Surface already unlocked");
}
long startTime = 0;
if (PROFILING) {
startTime = System.currentTimeMillis();
}
ds.FreeDrawingSurfaceInfo(dsi);
ds.Unlock();
JAWT.getJAWT().FreeDrawingSurface(ds);
ds = null;
dsi = null;
win32dsi = null;
hdc = 0;
if (PROFILING) {
long endTime = System.currentTimeMillis();
profilingUnlockSurfaceTime += (endTime - startTime);
int ticks = PROFILING_TICKS;
if (++profilingUnlockSurfaceTicks == ticks) {
System.err.println(
"UnlockSurface calls: "
+ profilingUnlockSurfaceTime
+ " ms / "
+ ticks
+ " calls ("
+ ((float) profilingUnlockSurfaceTime / (float) ticks)
+ " ms/call)");
profilingUnlockSurfaceTime = 0;
profilingUnlockSurfaceTicks = 0;
}
}
}
}
public class MacOSXAWTCGLGraphicsConfigurationFactory extends GraphicsConfigurationFactory {
protected static final boolean DEBUG = com.sun.opengl.impl.Debug.debug("GraphicsConfiguration");
public MacOSXAWTCGLGraphicsConfigurationFactory() {
GraphicsConfigurationFactory.registerFactory(
javax.media.nativewindow.awt.AWTGraphicsDevice.class, this);
}
public AbstractGraphicsConfiguration chooseGraphicsConfiguration(
Capabilities capabilities, CapabilitiesChooser chooser, AbstractGraphicsScreen absScreen) {
GraphicsDevice device = null;
if (absScreen != null && !(absScreen instanceof AWTGraphicsScreen)) {
throw new IllegalArgumentException(
"This GraphicsConfigurationFactory accepts only AWTGraphicsScreen objects");
}
if (null == absScreen) {
absScreen = AWTGraphicsScreen.createScreenDevice(-1);
}
AWTGraphicsScreen awtScreen = (AWTGraphicsScreen) absScreen;
device = ((AWTGraphicsDevice) awtScreen.getDevice()).getGraphicsDevice();
if (capabilities != null && !(capabilities instanceof GLCapabilities)) {
throw new IllegalArgumentException(
"This GraphicsConfigurationFactory accepts only GLCapabilities objects");
}
if (chooser != null && !(chooser instanceof GLCapabilitiesChooser)) {
throw new IllegalArgumentException(
"This GraphicsConfigurationFactory accepts only GLCapabilitiesChooser objects");
}
if (DEBUG) {
System.err.println("MacOSXAWTCGLGraphicsConfigurationFactory: got " + absScreen);
}
long displayHandle = 0;
MacOSXGraphicsDevice macDevice = new MacOSXGraphicsDevice();
DefaultGraphicsScreen macScreen = new DefaultGraphicsScreen(macDevice, awtScreen.getIndex());
if (DEBUG) {
System.err.println("MacOSXAWTCGLGraphicsConfigurationFactory: made " + macScreen);
}
GraphicsConfiguration gc = device.getDefaultConfiguration();
AWTGraphicsConfiguration.setupCapabilitiesRGBABits(capabilities, gc);
if (DEBUG) {
System.err.println("AWT Colormodel compatible: " + capabilities);
}
MacOSXCGLGraphicsConfiguration macConfig =
(MacOSXCGLGraphicsConfiguration)
GraphicsConfigurationFactory.getFactory(macDevice)
.chooseGraphicsConfiguration(capabilities, chooser, macScreen);
if (macConfig == null) {
throw new GLException(
"Unable to choose a GraphicsConfiguration: "
+ capabilities
+ ",\n\t"
+ chooser
+ "\n\t"
+ macScreen);
}
// FIXME: we have nothing to match .. so choose the default
return new AWTGraphicsConfiguration(
awtScreen,
macConfig.getChosenCapabilities(),
macConfig.getRequestedCapabilities(),
gc,
macConfig);
}
}
/**
* The default implementation of the {@link GLCapabilitiesChooser} interface, which provides
* consistent visual selection behavior across platforms. The precise algorithm is deliberately left
* loosely specified. Some properties are:
*
* <UL>
* <LI>As long as there is at least one available non-null GLCapabilities which matches the
* "stereo" option, will return a valid index.
* <LI>Attempts to match as closely as possible the given GLCapabilities, but will select one with
* fewer capabilities (i.e., lower color depth) if necessary.
* <LI>Prefers hardware-accelerated visuals to non-hardware-accelerated.
* <LI>If there is no exact match, prefers a more-capable visual to a less-capable one.
* <LI>If there is more than one exact match, chooses an arbitrary one.
* <LI>May select the opposite of a double- or single-buffered visual (based on the user's
* request) in dire situations.
* <LI>Color depth (including alpha) mismatches are weighted higher than depth buffer mismatches,
* which are in turn weighted higher than accumulation buffer (including alpha) and stencil
* buffer depth mismatches.
* <LI>If a valid windowSystemRecommendedChoice parameter is supplied, chooses that instead of
* using the cross-platform code.
* </UL>
*/
public class DefaultGLCapabilitiesChooser implements GLCapabilitiesChooser {
private static final boolean DEBUG = Debug.debug("CapabilitiesChooser");
public int chooseCapabilities(
Capabilities desired, Capabilities[] available, int windowSystemRecommendedChoice) {
GLCapabilities _desired = (GLCapabilities) desired;
GLCapabilities[] _available = (GLCapabilities[]) available;
if (DEBUG) {
System.err.println("Desired: " + _desired);
for (int i = 0; i < _available.length; i++) {
System.err.println("Available " + i + ": " + _available[i]);
}
System.err.println("Window system's recommended choice: " + windowSystemRecommendedChoice);
}
if (windowSystemRecommendedChoice >= 0
&& windowSystemRecommendedChoice < _available.length
&& _available[windowSystemRecommendedChoice] != null) {
if (DEBUG) {
System.err.println(
"Choosing window system's recommended choice of " + windowSystemRecommendedChoice);
System.err.println(_available[windowSystemRecommendedChoice]);
}
return windowSystemRecommendedChoice;
}
// Create score array
int[] scores = new int[_available.length];
int NO_SCORE = -9999999;
int DOUBLE_BUFFER_MISMATCH_PENALTY = 1000;
int STENCIL_MISMATCH_PENALTY = 500;
// Pseudo attempt to keep equal rank penalties scale-equivalent
// (e.g., stencil mismatch is 3 * accum because there are 3 accum
// components)
int COLOR_MISMATCH_PENALTY_SCALE = 36;
int DEPTH_MISMATCH_PENALTY_SCALE = 6;
int ACCUM_MISMATCH_PENALTY_SCALE = 1;
int STENCIL_MISMATCH_PENALTY_SCALE = 3;
for (int i = 0; i < scores.length; i++) {
scores[i] = NO_SCORE;
}
// Compute score for each
for (int i = 0; i < scores.length; i++) {
GLCapabilities cur = _available[i];
if (cur == null) {
continue;
}
if (_desired.isOnscreen() != cur.isOnscreen()) {
continue;
}
if (_desired.getStereo() != cur.getStereo()) {
continue;
}
int score = 0;
// Compute difference in color depth
// (Note that this decides the direction of all other penalties)
score +=
(COLOR_MISMATCH_PENALTY_SCALE
* ((cur.getRedBits() + cur.getGreenBits() + cur.getBlueBits() + cur.getAlphaBits())
- (_desired.getRedBits()
+ _desired.getGreenBits()
+ _desired.getBlueBits()
+ _desired.getAlphaBits())));
// Compute difference in depth buffer depth
score +=
(DEPTH_MISMATCH_PENALTY_SCALE
* sign(score)
* Math.abs(cur.getDepthBits() - _desired.getDepthBits()));
// Compute difference in accumulation buffer depth
score +=
(ACCUM_MISMATCH_PENALTY_SCALE
* sign(score)
* Math.abs(
(cur.getAccumRedBits()
+ cur.getAccumGreenBits()
+ cur.getAccumBlueBits()
+ cur.getAccumAlphaBits())
- (_desired.getAccumRedBits()
+ _desired.getAccumGreenBits()
+ _desired.getAccumBlueBits()
+ _desired.getAccumAlphaBits())));
// Compute difference in stencil bits
score +=
STENCIL_MISMATCH_PENALTY_SCALE
* sign(score)
* (cur.getStencilBits() - _desired.getStencilBits());
if (cur.getDoubleBuffered() != _desired.getDoubleBuffered()) {
score += sign(score) * DOUBLE_BUFFER_MISMATCH_PENALTY;
}
if ((_desired.getStencilBits() > 0) && (cur.getStencilBits() == 0)) {
score += sign(score) * STENCIL_MISMATCH_PENALTY;
}
scores[i] = score;
}
// Now prefer hardware-accelerated visuals by pushing scores of
// non-hardware-accelerated visuals out
boolean gotHW = false;
int maxAbsoluteHWScore = 0;
for (int i = 0; i < scores.length; i++) {
int score = scores[i];
if (score == NO_SCORE) {
continue;
}
GLCapabilities cur = _available[i];
if (cur.getHardwareAccelerated()) {
int absScore = Math.abs(score);
if (!gotHW || (absScore > maxAbsoluteHWScore)) {
gotHW = true;
maxAbsoluteHWScore = absScore;
}
}
}
if (gotHW) {
for (int i = 0; i < scores.length; i++) {
int score = scores[i];
if (score == NO_SCORE) {
continue;
}
GLCapabilities cur = _available[i];
if (!cur.getHardwareAccelerated()) {
if (score <= 0) {
score -= maxAbsoluteHWScore;
} else if (score > 0) {
score += maxAbsoluteHWScore;
}
scores[i] = score;
}
}
}
if (DEBUG) {
System.err.print("Scores: [");
for (int i = 0; i < _available.length; i++) {
if (i > 0) {
System.err.print(",");
}
System.err.print(" " + scores[i]);
}
System.err.println(" ]");
}
// Ready to select. Choose score closest to 0.
int scoreClosestToZero = NO_SCORE;
int chosenIndex = -1;
for (int i = 0; i < scores.length; i++) {
int score = scores[i];
if (score == NO_SCORE) {
continue;
}
// Don't substitute a positive score for a smaller negative score
if ((scoreClosestToZero == NO_SCORE)
|| (Math.abs(score) < Math.abs(scoreClosestToZero)
&& ((sign(scoreClosestToZero) < 0) || (sign(score) > 0)))) {
scoreClosestToZero = score;
chosenIndex = i;
}
}
if (chosenIndex < 0) {
throw new NativeWindowException("Unable to select one of the provided GLCapabilities");
}
if (DEBUG) {
System.err.println("Chosen index: " + chosenIndex);
System.err.println("Chosen capabilities:");
System.err.println(_available[chosenIndex]);
}
return chosenIndex;
}
private static int sign(int score) {
if (score < 0) {
return -1;
}
return 1;
}
}