146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/******************************************************************************
|
|
Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.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 {
|
|
texture_t target, prev_target;
|
|
zstencil_t zs, prev_zs;
|
|
|
|
uint32_t cx, cy;
|
|
|
|
enum gs_color_format format;
|
|
enum gs_zstencil_format zsformat;
|
|
|
|
bool rendered;
|
|
};
|
|
|
|
texrender_t 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 texrender_destroy(texrender_t texrender)
|
|
{
|
|
if (texrender) {
|
|
texture_destroy(texrender->target);
|
|
zstencil_destroy(texrender->zs);
|
|
bfree(texrender);
|
|
}
|
|
}
|
|
|
|
static bool texrender_resetbuffer(texrender_t texrender, uint32_t cx,
|
|
uint32_t cy)
|
|
{
|
|
if (!texrender)
|
|
return false;
|
|
|
|
texture_destroy(texrender->target);
|
|
zstencil_destroy(texrender->zs);
|
|
|
|
texrender->target = NULL;
|
|
texrender->zs = NULL;
|
|
texrender->cx = cx;
|
|
texrender->cy = cy;
|
|
|
|
texrender->target = gs_create_texture(cx, cy, texrender->format,
|
|
1, NULL, GS_RENDERTARGET);
|
|
if (!texrender->target)
|
|
return false;
|
|
|
|
if (texrender->zsformat != GS_ZS_NONE) {
|
|
texrender->zs = gs_create_zstencil(cx, cy, texrender->zsformat);
|
|
if (!texrender->zs) {
|
|
texture_destroy(texrender->target);
|
|
texrender->target = NULL;
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool texrender_begin(texrender_t texrender, uint32_t cx, uint32_t cy)
|
|
{
|
|
if (!texrender || texrender->rendered)
|
|
return false;
|
|
|
|
if (cx == 0)
|
|
cx = gs_getwidth();
|
|
if (cy == 0)
|
|
cy = gs_getheight();
|
|
|
|
assert(cx && cy);
|
|
if (!cx || !cy)
|
|
return false;
|
|
|
|
if (texrender->cx != cx || texrender->cy != cy)
|
|
if (!texrender_resetbuffer(texrender, cx, cy))
|
|
return false;
|
|
|
|
gs_viewport_push();
|
|
gs_projection_push();
|
|
gs_matrix_push();
|
|
gs_matrix_identity();
|
|
|
|
texrender->prev_target = gs_getrendertarget();
|
|
texrender->prev_zs = gs_getzstenciltarget();
|
|
gs_setrendertarget(texrender->target, texrender->zs);
|
|
|
|
gs_setviewport(0, 0, texrender->cx, texrender->cy);
|
|
|
|
return true;
|
|
}
|
|
|
|
void texrender_end(texrender_t texrender)
|
|
{
|
|
if (!texrender)
|
|
return;
|
|
|
|
gs_setrendertarget(texrender->prev_target, texrender->prev_zs);
|
|
|
|
gs_matrix_pop();
|
|
gs_projection_pop();
|
|
gs_viewport_pop();
|
|
|
|
texrender->rendered = true;
|
|
}
|
|
|
|
void texrender_reset(texrender_t texrender)
|
|
{
|
|
if (texrender)
|
|
texrender->rendered = false;
|
|
}
|
|
|
|
texture_t texrender_gettexture(texrender_t texrender)
|
|
{
|
|
return texrender ? texrender->target : NULL;
|
|
}
|