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https://github.com/obsproject/obs-studio.git
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83630fa14a
Passing 0,0 texture size should be considered legal, and safely return false to indicate that rendering can't begin. Also there's no need to try to use the current swap chain's width/height if either of the sizes are 0, there's no need try try to "force" success here anymore.
140 lines
3.4 KiB
C
140 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,
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1, 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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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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