private void bindWebGL() {
// Adds the Surface3D to the document.
Surface3D surface = new Surface3D(500, 500);
RootPanel.get().add(surface);
final GL2 gl = surface.getGL();
if (gl == null) {
Window.alert("No WebGL context found. Exiting.");
return;
}
// Sets up the GL context.
gl.clearColor(0.0f, 0f, 0f, 1f);
gl.clearDepth(1);
gl.viewport(0, 0, surface.getWidth(), surface.getHeight());
gl.enable(EnableCap.DEPTH_TEST);
gl.depthFunc(DepthFunction.LEQUAL);
gl.clear(ClearBufferMask.COLOR_BUFFER_BIT, ClearBufferMask.DEPTH_BUFFER_BIT);
// Creates a lambertian shader.
LambertianShader shader = new LambertianShader();
try {
shader.init(gl);
} catch (ShaderException e) {
Window.alert("Error loading the shader.");
return;
}
// Binds the shader.
shader.bind();
// Creates a sphere.
StaticMesh mesh = new StaticMesh(gl, PrimitiveFactory.makeSphere(30, 30));
mesh.setPositionIndex(shader.getAttributePosition());
mesh.setNormalIndex(shader.getAttributeNormal());
shader.setLightPosition(0, 5, 5);
shader.setDiffuseColor(1, 0, 0, 1);
// Sets up the model view matrix.
MatrixStack.MODELVIEW.push();
MatrixStack.MODELVIEW.translate(0, 0, -5);
shader.setModelViewMatrix(MatrixStack.MODELVIEW.get());
MatrixStack.MODELVIEW.pop();
// Sets up a basic camera for projection.
MatrixStack.PROJECTION.pushIdentity();
MatrixStack.PROJECTION.perspective(45, 1, .1f, 100);
shader.setProjectionMatrix(MatrixStack.PROJECTION.get());
MatrixStack.PROJECTION.pop();
// Draws the mesh.
mesh.draw();
mesh.dispose();
shader.dispose();
}
/** Create and initialize the WebGL context. */
public final boolean initWebGLContext() {
if (gl == null) {
gl =
GL2ContextHelper.getGL2(
getWidget(),
new WebGLContextAttributes() {
{
setStencilEnable(true);
}
});
if (gl == null) {
return false;
}
}
float[] cc = getState().clearColor;
gl.clearColor(cc[0], cc[1], cc[2], cc[3]);
gl.clearDepth(1);
gl.enable(EnableCap.DEPTH_TEST);
gl.depthFunc(DepthFunction.LEQUAL);
gl.clear(ClearBufferMask.COLOR_BUFFER_BIT, ClearBufferMask.DEPTH_BUFFER_BIT);
try {
shader =
new AbstractShader() {
@Override
protected void initImpl() throws ShaderException {
initProgram(getState().vertexShaderSource, getState().fragmentShaderSource);
}
};
shader.init(gl);
shader.bind();
} catch (ShaderException e) {
Window.alert(e.getMessage());
return false;
}
vertexPositionAttribute = shader.getAttributeLocation("aVertexPosition");
gl.enableVertexAttribArray(vertexPositionAttribute);
vertexColorAttribute = shader.getAttributeLocation("aVertexColor");
gl.enableVertexAttribArray(vertexColorAttribute);
PROJECTION.pushIdentity();
PROJECTION.perspective(getState().fov, 1, getState().minDist, getState().maxDist);
gl.uniformMatrix(shader.getUniformLocation("uPMatrix"), PROJECTION.get());
PROJECTION.pop();
buildBuffers(getState().shapes);
return true;
}
public void drawShapes() {
gl.clear(ClearBufferMask.COLOR_BUFFER_BIT, ClearBufferMask.DEPTH_BUFFER_BIT);
MODELVIEW.push();
float[] gt = getState().translation;
if (gt != null) {
MODELVIEW.translate(gt[0], gt[1], gt[2]);
}
for (int i = 0; i < vertices.length; ++i) {
WebGLState s = getState();
MODELVIEW.push();
MODELVIEW.translate(s.shapes[i].tx, s.shapes[i].ty, s.shapes[i].tz);
MODELVIEW.rotateX(s.shapes[i].rx);
MODELVIEW.rotateY(s.shapes[i].ry);
MODELVIEW.rotateZ(s.shapes[i].rz);
setMatrixUniforms();
MODELVIEW.pop();
gl.bindBuffer(BufferTarget.ARRAY_BUFFER, vertices[i]);
gl.vertexAttribPointer(vertexPositionAttribute, 3, DataType.FLOAT, false, 0, 0);
gl.bindBuffer(BufferTarget.ARRAY_BUFFER, colors[i]);
gl.vertexAttribPointer(vertexColorAttribute, 4, DataType.FLOAT, false, 0, 0);
if (indices[i] != null) {
gl.bindBuffer(BufferTarget.ELEMENT_ARRAY_BUFFER, indices[i]);
gl.drawElements(BeginMode.TRIANGLES, 36, DrawElementsType.UNSIGNED_SHORT, 0);
} else {
gl.drawArrays(BeginMode.TRIANGLE_STRIP, 0, 3);
}
}
MODELVIEW.pop();
}