protected boolean prepare(int fbufWidth, int fbufHeight) {
if (ctx.useShader(this) && glIsProgram(program)) {
glUseProgram(program);
ctx.checkGLError("Shader.prepare useProgram");
glUniform2f(uScreenSizeLoc, fbufWidth, fbufHeight);
// ctx.checkGLError("Shader.prepare uScreenSizeLoc set to " + fbufWidth + " " + fbufHeight);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBuffer);
ctx.checkGLError("Shader.prepare BindBuffer");
glEnableVertexAttribArray(aMatrix);
glEnableVertexAttribArray(aTranslation);
glEnableVertexAttribArray(aPosition);
if (aTexture != -1) glEnableVertexAttribArray(aTexture);
ctx.checkGLError("Shader.prepare AttribArrays enabled");
glVertexAttribPointer(aMatrix, 4, GL_FLOAT, false, VERTEX_STRIDE, 0);
glVertexAttribPointer(aTranslation, 2, GL_FLOAT, false, VERTEX_STRIDE, 16);
glVertexAttribPointer(aPosition, 2, GL_FLOAT, false, VERTEX_STRIDE, 24);
if (aTexture != -1) glVertexAttribPointer(aTexture, 2, GL_FLOAT, false, VERTEX_STRIDE, 32);
ctx.checkGLError("Shader.prepare AttribPointer");
return true;
}
return false;
}
private void initGLObjects() {
if (clTexture != NULL) {
checkCLError(clReleaseMemObject(clTexture));
glDeleteTextures(glTexture);
}
glTexture = glGenTextures();
// Init textures
glBindTexture(GL_TEXTURE_2D, glTexture);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA8UI,
ww,
wh,
0,
GL_RGBA_INTEGER,
GL_UNSIGNED_BYTE,
(ByteBuffer) null);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
clTexture =
clCreateFromGLTexture2D(
clContext, CL_MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, glTexture, errcode_ret);
checkCLError(errcode_ret);
glBindTexture(GL_TEXTURE_2D, 0);
glViewport(0, 0, fbw, fbh);
glUniform2f(sizeUniform, ww, wh);
FloatBuffer projectionMatrix = BufferUtils.createFloatBuffer(4 * 4);
glOrtho(0.0f, ww, 0.0f, wh, 0.0f, 1.0f, projectionMatrix);
glUniformMatrix4fv(projectionUniform, false, projectionMatrix);
shouldInitBuffers = false;
}