142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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/*
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* This is a set of helper functions to more easily render to textures
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* without having to duplicate too much code.
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*/
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#include <assert.h>
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#include "graphics.h"
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struct gs_texture_render {
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gs_texture_t *target, *prev_target;
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gs_zstencil_t *zs, *prev_zs;
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uint32_t cx, cy;
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enum gs_color_format format;
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enum gs_zstencil_format zsformat;
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bool rendered;
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};
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gs_texrender_t *gs_texrender_create(enum gs_color_format format,
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enum gs_zstencil_format zsformat)
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{
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struct gs_texture_render *texrender;
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texrender = bzalloc(sizeof(struct gs_texture_render));
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texrender->format = format;
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texrender->zsformat = zsformat;
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return texrender;
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}
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void gs_texrender_destroy(gs_texrender_t *texrender)
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{
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if (texrender) {
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gs_texture_destroy(texrender->target);
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gs_zstencil_destroy(texrender->zs);
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bfree(texrender);
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}
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}
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static bool texrender_resetbuffer(gs_texrender_t *texrender, uint32_t cx,
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uint32_t cy)
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{
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if (!texrender)
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return false;
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gs_texture_destroy(texrender->target);
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gs_zstencil_destroy(texrender->zs);
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texrender->target = NULL;
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texrender->zs = NULL;
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texrender->cx = cx;
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texrender->cy = cy;
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texrender->target = gs_texture_create(cx, cy, texrender->format, 1,
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NULL, GS_RENDER_TARGET);
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if (!texrender->target)
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return false;
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if (texrender->zsformat != GS_ZS_NONE) {
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texrender->zs = gs_zstencil_create(cx, cy, texrender->zsformat);
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if (!texrender->zs) {
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gs_texture_destroy(texrender->target);
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texrender->target = NULL;
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return false;
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}
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}
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return true;
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}
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bool gs_texrender_begin(gs_texrender_t *texrender, uint32_t cx, uint32_t cy)
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{
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if (!texrender || texrender->rendered)
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return false;
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if (!cx || !cy)
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return false;
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if (texrender->cx != cx || texrender->cy != cy)
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if (!texrender_resetbuffer(texrender, cx, cy))
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return false;
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if (!texrender->target)
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return false;
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gs_viewport_push();
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gs_projection_push();
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gs_matrix_push();
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gs_matrix_identity();
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texrender->prev_target = gs_get_render_target();
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texrender->prev_zs = gs_get_zstencil_target();
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gs_set_render_target(texrender->target, texrender->zs);
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gs_set_viewport(0, 0, texrender->cx, texrender->cy);
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return true;
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}
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void gs_texrender_end(gs_texrender_t *texrender)
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{
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if (!texrender)
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return;
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gs_set_render_target(texrender->prev_target, texrender->prev_zs);
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gs_matrix_pop();
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gs_projection_pop();
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gs_viewport_pop();
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texrender->rendered = true;
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}
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void gs_texrender_reset(gs_texrender_t *texrender)
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{
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if (texrender)
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texrender->rendered = false;
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}
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gs_texture_t *gs_texrender_get_texture(const gs_texrender_t *texrender)
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{
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return texrender ? texrender->target : NULL;
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}
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