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/*
* 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) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*
* GPU Framebuffer
* - this is a wrapper for an OpenGL framebuffer object (FBO). in practice
* multiple FBO's may be created.
* - actual FBO creation & config is deferred until GPU_framebuffer_bind or
* GPU_framebuffer_check_valid to allow creation & config while another
* opengl context is bound (since FBOs are not shared between ogl contexts).
*/
#pragma once
#include "BLI_assert.h"
#include "glew-mx.h"
namespace blender {
namespace gpu {
static GLenum to_gl(eGPUDataFormat format)
{
switch (format) {
case GPU_DATA_FLOAT:
return GL_FLOAT;
case GPU_DATA_INT:
return GL_INT;
case GPU_DATA_UNSIGNED_INT:
return GL_UNSIGNED_INT;
case GPU_DATA_UNSIGNED_BYTE:
return GL_UNSIGNED_BYTE;
case GPU_DATA_UNSIGNED_INT_24_8:
return GL_UNSIGNED_INT_24_8;
case GPU_DATA_10_11_11_REV:
return GL_UNSIGNED_INT_10F_11F_11F_REV;
default:
BLI_assert(!"Unhandled data format");
return GL_FLOAT;
}
}
/* Assume Unorm / Float target. Used with glReadPixels. */
static GLenum channel_len_to_gl(int channel_len)
{
switch (channel_len) {
case 1:
return GL_RED;
case 2:
return GL_RG;
case 3:
return GL_RGB;
case 4:
return GL_RGBA;
default:
BLI_assert(!"Wrong number of texture channels");
return GL_RED;
}
}
} // namespace gpu
} // namespace blender
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