/** 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;
}
@Override
public void dispose() {
if (shader != null) {
shader.dispose();
for (WebGLBuffer b : vertices) {
gl.deleteBuffer(b);
}
for (WebGLBuffer b : colors) {
gl.deleteBuffer(b);
}
for (WebGLBuffer b : indices) {
if (b != null) {
gl.deleteBuffer(b);
}
}
}
}
private void setMatrixUniforms() {
gl.uniformMatrix(shader.getUniformLocation("uMVMatrix"), MODELVIEW.get());
}