void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) {
int primitiveIndex = 0;
GLenum primitive = GL_POINTS;
int doRasterizerDiscard = 0;
int status;
GLenum error = GL_NO_ERROR;
dotsMglClearGLErrors();
// check for transform feedback extension!
if (!dotsMglIsExtensionSupported(EXTENSION)){
plhs[0] = mxCreateDoubleScalar(-1);
mexPrintf("(dotsMglBeginTransformFeedback) %s is not supported!\n",
EXTENSION);
return;
}
// check input arguments
if (nrhs < 1 || nrhs > 2 || !mxIsDouble(prhs[0]) || mxIsEmpty(prhs[0])) {
plhs[0] = mxCreateDoubleScalar(-2);
usageError("dotsMglBeginTransformFeedback");
return;
}
// choose kind of primitive will be captured
primitiveIndex = mxGetScalar(prhs[0]);
if (primitiveIndex >= 0 && primitiveIndex < NUM_GL_PRIMITIVES)
primitive = GL_PRIMITIVES[primitiveIndex];
// choose to truncate the GL pipeline or allow drawing
if (nrhs >= 2 && mxIsDouble(prhs[1]) && !mxIsEmpty(prhs[1])) {
if (mxGetScalar(prhs[1]))
glEnable(GL_RASTERIZER_DISCARD_EXT);
else
glDisable(GL_RASTERIZER_DISCARD_EXT);
}
// start capturing varyings
glBeginTransformFeedbackEXT(primitive);
error = glGetError();
if (error != GL_NO_ERROR) {
mexPrintf("(dotsMglSelectTransformFeedback) Could not begin transform feedback for primitive index %d (primitive=%d). glGetError()=%d\n",
primitiveIndex, primitive, error);
plhs[0] = mxCreateDoubleScalar(-3);
return;
}
// success!
plhs[0] = mxCreateDoubleScalar(0);
}
static bool
test_transform_feedback_prim(GLenum tf_prim, const char *tf_name)
{
bool pass = true;
int i;
glBeginTransformFeedbackEXT(tf_prim);
for (i = 0; i < ARRAY_SIZE(prims); i++) {
pass = pass && test_one_prim(tf_prim, tf_name, i);
}
glEndTransformFeedbackEXT();
return pass;
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_EXTTransformFeedback_glBeginTransformFeedbackEXT(JNIEnv *__env, jclass clazz, jint primitiveMode) {
glBeginTransformFeedbackEXTPROC glBeginTransformFeedbackEXT = (glBeginTransformFeedbackEXTPROC)tlsGetFunction(1828);
UNUSED_PARAM(clazz)
glBeginTransformFeedbackEXT(primitiveMode);
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_EXTTransformFeedback_nglBeginTransformFeedbackEXT(JNIEnv *env, jclass clazz, jint primitiveMode, jlong function_pointer) {
glBeginTransformFeedbackEXTPROC glBeginTransformFeedbackEXT = (glBeginTransformFeedbackEXTPROC)((intptr_t)function_pointer);
glBeginTransformFeedbackEXT(primitiveMode);
}