GPU_framebuffer.h

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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) 2005 Blender Foundation.
 * All rights reserved.
 */
 
#pragma once
 
#include "GPU_texture.h"
 
typedef enum eGPUFrameBufferBits {
  GPU_COLOR_BIT = (1 << 0),
  GPU_DEPTH_BIT = (1 << 1),
  GPU_STENCIL_BIT = (1 << 2),
} eGPUFrameBufferBits;
 
ENUM_OPERATORS(eGPUFrameBufferBits, GPU_STENCIL_BIT)
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct GPUAttachment {
  struct GPUTexture *tex;
  int layer, mip;
} GPUAttachment;
 
typedef enum eGPUBackBuffer {
  GPU_BACKBUFFER_LEFT = 0,
  GPU_BACKBUFFER_RIGHT,
} eGPUBackBuffer;
 
typedef struct GPUFrameBuffer GPUFrameBuffer;
 
typedef struct GPUOffScreen GPUOffScreen;
 
GPUFrameBuffer *GPU_framebuffer_create(const char *name);
void GPU_framebuffer_free(GPUFrameBuffer *fb);
void GPU_framebuffer_bind(GPUFrameBuffer *fb);
void GPU_framebuffer_bind_no_srgb(GPUFrameBuffer *fb);
void GPU_framebuffer_restore(void);
 
bool GPU_framebuffer_bound(GPUFrameBuffer *fb);
bool GPU_framebuffer_check_valid(GPUFrameBuffer *fb, char err_out[256]);
 
GPUFrameBuffer *GPU_framebuffer_active_get(void);
GPUFrameBuffer *GPU_framebuffer_back_get(void);
 
#define GPU_FRAMEBUFFER_FREE_SAFE(fb) \
  do { \
    if (fb != NULL) { \
      GPU_framebuffer_free(fb); \
      fb = NULL; \
    } \
  } while (0)
 
/* Frame-buffer setup: You need to call #GPU_framebuffer_bind for these
 * to be effective. */
 
void GPU_framebuffer_texture_attach_ex(GPUFrameBuffer *gpu_fb, GPUAttachment attachment, int slot);
void GPU_framebuffer_texture_detach(GPUFrameBuffer *fb, struct GPUTexture *tex);
 
#define GPU_framebuffer_ensure_config(_fb, ...) \
  do { \
    if (*(_fb) == NULL) { \
      *(_fb) = GPU_framebuffer_create(#_fb); \
    } \
    GPUAttachment config[] = __VA_ARGS__; \
    GPU_framebuffer_config_array(*(_fb), config, (sizeof(config) / sizeof(GPUAttachment))); \
  } while (0)
 
void GPU_framebuffer_config_array(GPUFrameBuffer *fb, const GPUAttachment *config, int config_len);
 
#define GPU_ATTACHMENT_NONE \
  { \
    NULL, -1, 0, \
  }
#define GPU_ATTACHMENT_LEAVE \
  { \
    NULL, -1, -1, \
  }
#define GPU_ATTACHMENT_TEXTURE(_tex) \
  { \
    _tex, -1, 0, \
  }
#define GPU_ATTACHMENT_TEXTURE_MIP(_tex, _mip) \
  { \
    _tex, -1, _mip, \
  }
#define GPU_ATTACHMENT_TEXTURE_LAYER(_tex, _layer) \
  { \
    _tex, _layer, 0, \
  }
#define GPU_ATTACHMENT_TEXTURE_LAYER_MIP(_tex, _layer, _mip) \
  { \
    _tex, _layer, _mip, \
  }
#define GPU_ATTACHMENT_TEXTURE_CUBEFACE(_tex, _face) \
  { \
    _tex, _face, 0, \
  }
#define GPU_ATTACHMENT_TEXTURE_CUBEFACE_MIP(_tex, _face, _mip) \
  { \
    _tex, _face, _mip, \
  }
 
void GPU_framebuffer_texture_attach(GPUFrameBuffer *fb, GPUTexture *tex, int slot, int mip);
void GPU_framebuffer_texture_layer_attach(
    GPUFrameBuffer *fb, GPUTexture *tex, int slot, int layer, int mip);
void GPU_framebuffer_texture_cubeface_attach(
    GPUFrameBuffer *fb, GPUTexture *tex, int slot, int face, int mip);
 
/* Frame-buffer operations. */
 
void GPU_framebuffer_viewport_set(GPUFrameBuffer *fb, int x, int y, int w, int h);
void GPU_framebuffer_viewport_get(GPUFrameBuffer *fb, int r_viewport[4]);
void GPU_framebuffer_viewport_reset(GPUFrameBuffer *fb);
 
void GPU_framebuffer_clear(GPUFrameBuffer *fb,
                           eGPUFrameBufferBits buffers,
                           const float clear_col[4],
                           float clear_depth,
                           unsigned int clear_stencil);
 
#define GPU_framebuffer_clear_color(fb, col) \
  GPU_framebuffer_clear(fb, GPU_COLOR_BIT, col, 0.0f, 0x00)
 
#define GPU_framebuffer_clear_depth(fb, depth) \
  GPU_framebuffer_clear(fb, GPU_DEPTH_BIT, NULL, depth, 0x00)
 
#define GPU_framebuffer_clear_color_depth(fb, col, depth) \
  GPU_framebuffer_clear(fb, GPU_COLOR_BIT | GPU_DEPTH_BIT, col, depth, 0x00)
 
#define GPU_framebuffer_clear_stencil(fb, stencil) \
  GPU_framebuffer_clear(fb, GPU_STENCIL_BIT, NULL, 0.0f, stencil)
 
#define GPU_framebuffer_clear_depth_stencil(fb, depth, stencil) \
  GPU_framebuffer_clear(fb, GPU_DEPTH_BIT | GPU_STENCIL_BIT, NULL, depth, stencil)
 
#define GPU_framebuffer_clear_color_depth_stencil(fb, col, depth, stencil) \
  GPU_framebuffer_clear(fb, GPU_COLOR_BIT | GPU_DEPTH_BIT | GPU_STENCIL_BIT, col, depth, stencil)
 
void GPU_framebuffer_multi_clear(GPUFrameBuffer *fb, const float (*clear_cols)[4]);
 
void GPU_framebuffer_read_depth(
    GPUFrameBuffer *fb, int x, int y, int w, int h, eGPUDataFormat format, void *data);
void GPU_framebuffer_read_color(GPUFrameBuffer *fb,
                                int x,
                                int y,
                                int w,
                                int h,
                                int channels,
                                int slot,
                                eGPUDataFormat format,
                                void *data);
 
void GPU_framebuffer_blit(GPUFrameBuffer *fb_read,
                          int read_slot,
                          GPUFrameBuffer *fb_write,
                          int write_slot,
                          eGPUFrameBufferBits blit_buffers);
 
void GPU_framebuffer_recursive_downsample(GPUFrameBuffer *fb,
                                          int max_lvl,
                                          void (*callback)(void *userData, int level),
                                          void *userData);
 
void GPU_framebuffer_push(GPUFrameBuffer *fb);
GPUFrameBuffer *GPU_framebuffer_pop(void);
uint GPU_framebuffer_stack_level_get(void);
 
/* GPU OffScreen
 * - wrapper around frame-buffer and texture for simple off-screen drawing
 */
 
GPUOffScreen *GPU_offscreen_create(
    int width, int height, bool depth, bool high_bitdepth, char err_out[256]);
void GPU_offscreen_free(GPUOffScreen *ofs);
void GPU_offscreen_bind(GPUOffScreen *ofs, bool save);
void GPU_offscreen_unbind(GPUOffScreen *ofs, bool restore);
void GPU_offscreen_read_pixels(GPUOffScreen *ofs, eGPUDataFormat format, void *pixels);
void GPU_offscreen_draw_to_screen(GPUOffScreen *ofs, int x, int y);
int GPU_offscreen_width(const GPUOffScreen *ofs);
int GPU_offscreen_height(const GPUOffScreen *ofs);
struct GPUTexture *GPU_offscreen_color_texture(const GPUOffScreen *ofs);
 
void GPU_offscreen_viewport_data_get(GPUOffScreen *ofs,
                                     GPUFrameBuffer **r_fb,
                                     struct GPUTexture **r_color,
                                     struct GPUTexture **r_depth);
 
void GPU_clear_color(float red, float green, float blue, float alpha);
void GPU_clear_depth(float depth);
 
void GPU_frontbuffer_read_pixels(
    int x, int y, int w, int h, int channels, eGPUDataFormat format, void *data);
 
void GPU_backbuffer_bind(eGPUBackBuffer buffer);
 
#ifdef __cplusplus
}
#endif