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;
}
private void renderGL() {
glClear(GL_COLOR_BUFFER_BIT);
// draw slices
if (!syncGLtoCL) {
glWaitSync(glFenceFromCLEvent, 0, 0);
glDeleteSync(glFenceFromCLEvent);
glFenceFromCLEvent = NULL;
int errcode = clReleaseEvent(clEvent);
clEvent = NULL;
checkCLError(errcode);
}
glBindTexture(GL_TEXTURE_2D, glTexture);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}