/**
* Renders the tile to the given context, in the process building all needed resources.
*
* @param gl
*/
public void render(GL gl) {
projection = ProjectionFactory.getCurrentProjection();
heightmap = State.getInstance().getLoadedHeightmap();
// BUILD TEXTURES IF NECESSARY
if (!gl.glIsTexture(textureID)) {
textureID = createTexture(gl, getImage(), false);
// prerenderToTexture(gl);
}
if (!gl.glIsTexture(grainTextureID)) {
createGrainTexture(gl);
}
// RENDER TILE FROM DISPLAY LIST, OR ELSE BUILD DISPLAY LIST
if (gl.glIsList(displaylistID)) {
gl.glCallList(displaylistID);
} else {
displaylistID = gl.glGenLists(1);
gl.glNewList(displaylistID, GL_COMPILE_AND_EXECUTE);
gl.glActiveTexture(GL_TEXTURE0);
gl.glEnable(GL_TEXTURE_2D);
gl.glBindTexture(GL_TEXTURE_2D, grainTextureID);
gl.glActiveTexture(GL_TEXTURE1);
gl.glEnable(GL_TEXTURE_2D);
gl.glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
gl.glBindTexture(GL_TEXTURE_2D, textureID);
gl.glColor3f(1, 1, 1);
float[] color = new float[3];
float hRes = HEIGHT_RESOLUTION - 1;
float stepSize = bounds.getWidth() / hRes;
Coordinates pos = new Coordinates();
for (int x = 0; x < hRes; x++) {
gl.glBegin(GL_TRIANGLE_STRIP);
for (int y = 0; y <= hRes; y++) {
for (int i = 0; i < 2; i++) {
pos.setLatitude(bounds.getTop() + y * stepSize);
pos.setLongitude(bounds.getLeft() + (x + i) * stepSize);
gl.glMultiTexCoord2f(
GL_TEXTURE0, (x + i) / (float) GRAIN_RESOLUTION, y / (float) GRAIN_RESOLUTION);
gl.glMultiTexCoord2f(GL_TEXTURE1, (x + i) / hRes, y / hRes);
float height = heights[x + HEIGHT_BORDER + i][y + HEIGHT_BORDER];
getHeightColor(color, height);
float shade = getShade(x + i, y, stepSize);
gl.glColor3f(color[0] * shade, color[1] * shade, color[2] * shade);
gl.glVertex3f(pos.getLongitude(), pos.getLatitude(), height);
}
}
gl.glEnd();
}
gl.glDisable(GL_TEXTURE_2D);
gl.glActiveTexture(GL_TEXTURE0);
renderPOIs(gl);
gl.glEndList();
}
}
@Override
public void prerender() {
super.prerender();
projection = ProjectionFactory.getCurrentProjection();
Bounds geoBounds =
new Bounds(
projection.getGeoCoordinates(bounds.getTopLeft()),
projection.getGeoCoordinates(bounds.getBottomRight()),
true);
State.getInstance().getLoadedHeightmap().reduceSection(geoBounds, getHeights(), HEIGHT_BORDER);
minHeight = heights[0][0];
maxHeight = heights[0][0];
for (int x = 0; x < heights.length; x++) {
for (int y = 0; y < heights[x].length; y++) {
if (heights[x][y] < minHeight) {
minHeight = heights[x][y];
}
if (heights[x][y] > maxHeight) {
maxHeight = heights[x][y];
}
}
}
}