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/******************************************************************************
Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>
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, see <http://www.gnu.org/licenses/>.
******************************************************************************/
/*
* This is a set of helper functions to more easily render to textures
* without having to duplicate too much code.
*/
#include <assert.h>
#include "graphics.h"
struct gs_texture_render {
gs_texture_t *target, *prev_target;
gs_zstencil_t *zs, *prev_zs;
enum gs_color_space prev_space;
uint32_t cx, cy;
enum gs_color_format format;
enum gs_zstencil_format zsformat;
bool rendered;
};
gs_texrender_t *gs_texrender_create(enum gs_color_format format,
enum gs_zstencil_format zsformat)
{
struct gs_texture_render *texrender;
texrender = bzalloc(sizeof(struct gs_texture_render));
texrender->format = format;
texrender->zsformat = zsformat;
return texrender;
}
void gs_texrender_destroy(gs_texrender_t *texrender)
{
if (texrender) {
gs_texture_destroy(texrender->target);
gs_zstencil_destroy(texrender->zs);
bfree(texrender);
}
}
static bool texrender_resetbuffer(gs_texrender_t *texrender, uint32_t cx,
uint32_t cy)
{
if (!texrender)
return false;
gs_texture_destroy(texrender->target);
gs_zstencil_destroy(texrender->zs);
texrender->target = NULL;
texrender->zs = NULL;
texrender->cx = cx;
texrender->cy = cy;
texrender->target = gs_texture_create(cx, cy, texrender->format, 1,
NULL, GS_RENDER_TARGET);
if (!texrender->target)
return false;
if (texrender->zsformat != GS_ZS_NONE) {
texrender->zs = gs_zstencil_create(cx, cy, texrender->zsformat);
if (!texrender->zs) {
gs_texture_destroy(texrender->target);
texrender->target = NULL;
return false;
}
}
return true;
}
bool gs_texrender_begin(gs_texrender_t *texrender, uint32_t cx, uint32_t cy)
{
return gs_texrender_begin_with_color_space(texrender, cx, cy,
GS_CS_SRGB);
}
bool gs_texrender_begin_with_color_space(gs_texrender_t *texrender, uint32_t cx,
uint32_t cy, enum gs_color_space space)
{
if (!texrender || texrender->rendered)
return false;
if (!cx || !cy)
return false;
if (texrender->cx != cx || texrender->cy != cy)
if (!texrender_resetbuffer(texrender, cx, cy))
return false;
if (!texrender->target)
return false;
gs_viewport_push();
gs_projection_push();
gs_matrix_push();
gs_matrix_identity();
texrender->prev_target = gs_get_render_target();
texrender->prev_zs = gs_get_zstencil_target();
texrender->prev_space = gs_get_color_space();
gs_set_render_target_with_color_space(texrender->target, texrender->zs,
space);
gs_set_viewport(0, 0, texrender->cx, texrender->cy);
return true;
}
void gs_texrender_end(gs_texrender_t *texrender)
{
if (!texrender)
return;
gs_set_render_target_with_color_space(texrender->prev_target,
texrender->prev_zs,
texrender->prev_space);
gs_matrix_pop();
gs_projection_pop();
gs_viewport_pop();
texrender->rendered = true;
}
void gs_texrender_reset(gs_texrender_t *texrender)
{
if (texrender)
texrender->rendered = false;
}
gs_texture_t *gs_texrender_get_texture(const gs_texrender_t *texrender)
{
return texrender ? texrender->target : NULL;
}
enum gs_color_format gs_texrender_get_format(const gs_texrender_t *texrender)
{
return texrender->format;
}
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