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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2005 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Clement Foucault.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file gpu_uniformbuffer.c
* \ingroup gpu
*/
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "GPU_extensions.h"
#include "GPU_glew.h"
#include "GPU_uniformbuffer.h"
struct GPUUniformBuffer {
int size; /* in bytes */
GLuint bindcode; /* opengl identifier for UBO */
int bindpoint; /* current binding point */
};
GPUUniformBuffer *GPU_uniformbuffer_create(int size, const void *data, char err_out[256])
{
GPUUniformBuffer *ubo = MEM_callocN(sizeof(GPUUniformBuffer), "GPUUniformBuffer");
ubo->size = size;
/* Generate Buffer object */
glGenBuffers(1, &ubo->bindcode);
if (!ubo->bindcode) {
if (err_out)
BLI_snprintf(err_out, 256, "GPUUniformBuffer: UBO create failed");
GPU_uniformbuffer_free(ubo);
return NULL;
}
if (ubo->size > GPU_max_ubo_size()) {
if (err_out)
BLI_snprintf(err_out, 256, "GPUUniformBuffer: UBO too big");
GPU_uniformbuffer_free(ubo);
return NULL;
}
glBindBuffer(GL_UNIFORM_BUFFER, ubo->bindcode);
glBufferData(GL_UNIFORM_BUFFER, ubo->size, data, GL_DYNAMIC_DRAW);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
return ubo;
}
void GPU_uniformbuffer_free(GPUUniformBuffer *ubo)
{
glDeleteBuffers(1, &ubo->bindcode);
MEM_freeN(ubo);
}
void GPU_uniformbuffer_update(GPUUniformBuffer *ubo, const void *data)
{
glBindBuffer(GL_UNIFORM_BUFFER, ubo->bindcode);
glBufferSubData(GL_UNIFORM_BUFFER, 0, ubo->size, data);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
}
void GPU_uniformbuffer_bind(GPUUniformBuffer *ubo, int number)
{
if (number >= GPU_max_ubo_binds()) {
fprintf(stderr, "Not enough UBO slots.\n");
return;
}
if (ubo->bindcode != 0) {
glBindBufferBase(GL_UNIFORM_BUFFER, number, ubo->bindcode);
}
ubo->bindpoint = number;
}
int GPU_uniformbuffer_bindpoint(GPUUniformBuffer *ubo)
{
return ubo->bindpoint;
}
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