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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 "MEM_guardedalloc.h"
#include "BLI_assert.h"
#include "gpu_texture_private.hh"
#include "glew-mx.h"
namespace blender {
namespace gpu {
#if 0
class GLContext {
/** Currently bound textures. Updated before drawing. */
GLuint bound_textures[64];
GLuint bound_samplers[64];
/** All sampler objects. Last one is for icon sampling. */
GLuint samplers[GPU_SAMPLER_MAX + 1];
};
#endif
class GLTexture : public Texture {
private:
/** Texture unit to which this texture is bound. */
int slot = -1;
/** Target to bind the texture to (GL_TEXTURE_1D, GL_TEXTURE_2D, etc...)*/
GLenum target_ = -1;
/** opengl identifier for texture. */
GLuint tex_id_ = 0;
/** Legacy workaround for texture copy. */
GLuint copy_fb = 0;
GPUContext *copy_fb_ctx = NULL;
public:
GLTexture(const char *name);
~GLTexture();
void bind(int slot) override;
void update(void *data) override;
void update_sub(void *data, int offset[3], int size[3]) override;
void generate_mipmap(void) override;
void copy_to(Texture *tex) override;
void swizzle_set(char swizzle_mask[4]) override;
/* TODO(fclem) Legacy. Should be removed at some point. */
uint gl_bindcode_get(void) override;
private:
void init(void);
};
static inline GLenum target_to_gl(eGPUTextureFlag target)
{
switch (target & GPU_TEXTURE_TARGET) {
case GPU_TEXTURE_1D:
return GL_TEXTURE_1D;
case GPU_TEXTURE_1D | GPU_TEXTURE_ARRAY:
return GL_TEXTURE_1D_ARRAY;
case GPU_TEXTURE_2D:
return GL_TEXTURE_2D;
case GPU_TEXTURE_2D | GPU_TEXTURE_ARRAY:
return GL_TEXTURE_2D_ARRAY;
case GPU_TEXTURE_3D:
return GL_TEXTURE_3D;
case GPU_TEXTURE_CUBE:
return GL_TEXTURE_CUBE_MAP;
case GPU_TEXTURE_CUBE | GPU_TEXTURE_ARRAY:
return GL_TEXTURE_CUBE_MAP_ARRAY_ARB;
case GPU_TEXTURE_BUFFER:
return GL_TEXTURE_BUFFER;
default:
BLI_assert(0);
return GPU_TEXTURE_1D;
}
}
static inline GLenum swizzle_to_gl(const char swizzle)
{
switch (swizzle) {
default:
case 'x':
case 'r':
return GL_RED;
case 'y':
case 'g':
return GL_GREEN;
case 'z':
case 'b':
return GL_BLUE;
case 'w':
case 'a':
return GL_ALPHA;
case '0':
return GL_ZERO;
case '1':
return GL_ONE;
}
}
static inline 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 inline 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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