Differential D15291 Diff 54688 intern/opensubdiv/internal/evaluator/gl_compute_evaluator.cc

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intern/opensubdiv/internal/evaluator/gl_compute_evaluator.cc

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	//			//
	// Unless required by applicable law or agreed to in writing, software			// Unless required by applicable law or agreed to in writing, software
	// distributed under the Apache License with the above modification is			// distributed under the Apache License with the above modification is
	// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY			// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	// KIND, either express or implied. See the Apache License for the specific			// KIND, either express or implied. See the Apache License for the specific
	// language governing permissions and limitations under the Apache License.			// language governing permissions and limitations under the Apache License.
	//			//

	#include "gl_compute_evaluator.h"			#include <epoxy/gl.h>

				/* There are few aspects here:
				* - macOS is strict about including both gl.h and gl3.h
				* - libepoxy only pretends to be a replacement for gl.h
				* - OpenSubdiv internally uses `OpenGL/gl3.h` on macOS
				*
				* In order to silence the warning pretend that gl3 has been included, fully relying on symbols
				* from the epoxy.
				*
				* This works differently from how OpenSubdiv internally will use `OpenGL/gl3.h` without epoxy.
				* Sounds fragile, but so far things seems to work. */
				#if defined(__APPLE__)
				# define __gl3_h_
				#endif

	#include <GL/glew.h>			#include "gl_compute_evaluator.h"

	#include <opensubdiv/far/error.h>			#include <opensubdiv/far/error.h>
	#include <opensubdiv/far/patchDescriptor.h>			#include <opensubdiv/far/patchDescriptor.h>
	#include <opensubdiv/far/stencilTable.h>			#include <opensubdiv/far/stencilTable.h>
	#include <opensubdiv/osd/glslPatchShaderSource.h>			#include <opensubdiv/osd/glslPatchShaderSource.h>

	#include <cassert>			#include <cassert>
	#include <cmath>			#include <cmath>
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	{			{
	if (src.empty()) {			if (src.empty()) {
	return 0;			return 0;
	}			}

	GLuint devicePtr = 0;			GLuint devicePtr = 0;

	#if defined(GL_ARB_direct_state_access)			#if defined(GL_ARB_direct_state_access)
	if (GLEW_ARB_direct_state_access) {			if (epoxy_has_gl_extension("GL_ARB_direct_state_access")) {
	glCreateBuffers(1, &devicePtr);			glCreateBuffers(1, &devicePtr);
	glNamedBufferData(devicePtr, src.size() * sizeof(T), &src.at(0), GL_STATIC_DRAW);			glNamedBufferData(devicePtr, src.size() * sizeof(T), &src.at(0), GL_STATIC_DRAW);
	}			}
	else			else
	#endif			#endif
	{			{
	GLint prev = 0;			GLint prev = 0;
	glGetIntegerv(GL_SHADER_STORAGE_BUFFER_BINDING, &prev);			glGetIntegerv(GL_SHADER_STORAGE_BUFFER_BINDING, &prev);
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