mirror of
https://github.com/obsproject/obs-studio.git
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587 lines
16 KiB
C
587 lines
16 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 3 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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#include "gl-subsystem.h"
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#include "gl-shaderparser.h"
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static void gl_write_function_contents(struct gl_shader_parser *glsp,
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struct cf_token **p_token, const char *end);
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static inline struct shader_var *sp_getparam(struct gl_shader_parser *glsp,
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struct cf_token *token)
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{
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size_t i;
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for (i = 0; i < glsp->parser.params.num; i++) {
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struct shader_var *param = glsp->parser.params.array+i;
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if (strref_cmp(&token->str, param->name) == 0)
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return param;
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}
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return NULL;
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}
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static inline size_t sp_getsampler(struct gl_shader_parser *glsp,
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struct cf_token *token)
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{
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size_t i;
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for (i = 0; i < glsp->parser.samplers.num; i++) {
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struct shader_sampler *sampler = glsp->parser.samplers.array+i;
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if (strref_cmp(&token->str, sampler->name) == 0)
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return i;
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}
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return -1;
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}
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static bool gl_write_type_n(struct gl_shader_parser *glsp,
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const char *type, size_t len)
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{
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if (astrcmp_n(type, "float2", len) == 0)
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dstr_cat(&glsp->gl_string, "vec2");
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else if (astrcmp_n(type, "float3", len) == 0)
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dstr_cat(&glsp->gl_string, "vec3");
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else if (astrcmp_n(type, "float4", len) == 0)
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dstr_cat(&glsp->gl_string, "vec4");
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else if (astrcmp_n(type, "float3x3", len) == 0)
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dstr_cat(&glsp->gl_string, "mat3x3");
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else if (astrcmp_n(type, "float3x4", len) == 0)
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dstr_cat(&glsp->gl_string, "mat3x4");
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else if (astrcmp_n(type, "float4x4", len) == 0)
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dstr_cat(&glsp->gl_string, "mat4x4");
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else if (astrcmp_n(type, "texture2d", len) == 0)
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dstr_cat(&glsp->gl_string, "sampler2D");
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else if (astrcmp_n(type, "texture3d", len) == 0)
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dstr_cat(&glsp->gl_string, "sampler3D");
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else if (astrcmp_n(type, "texture_cube", len) == 0)
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dstr_cat(&glsp->gl_string, "samplerCube");
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else
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return false;
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return true;
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}
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static inline void gl_write_type(struct gl_shader_parser *glsp,
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const char *type)
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{
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if (!gl_write_type_n(glsp, type, strlen(type)))
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dstr_cat(&glsp->gl_string, type);
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}
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static inline bool gl_write_type_token(struct gl_shader_parser *glsp,
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struct cf_token *token)
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{
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return gl_write_type_n(glsp, token->str.array, token->str.len);
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}
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static void gl_write_var(struct gl_shader_parser *glsp, struct shader_var *var)
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{
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if (var->var_type == SHADER_VAR_UNIFORM)
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dstr_cat(&glsp->gl_string, "uniform ");
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else if (var->var_type == SHADER_VAR_CONST)
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dstr_cat(&glsp->gl_string, "const ");
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gl_write_type(glsp, var->type);
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dstr_cat(&glsp->gl_string, " ");
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dstr_cat(&glsp->gl_string, var->name);
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}
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static inline void gl_write_params(struct gl_shader_parser *glsp)
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{
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size_t i;
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for (i = 0; i < glsp->parser.params.num; i++) {
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struct shader_var *var = glsp->parser.params.array+i;
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gl_write_var(glsp, var);
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dstr_cat(&glsp->gl_string, ";\n");
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}
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dstr_cat(&glsp->gl_string, "\n");
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}
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static void gl_write_storage_var(struct gl_shader_parser *glsp,
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struct shader_var *var, const char *storage,
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const char *prefix);
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/* unwraps a structure that's used for input/output */
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static void gl_unwrap_storage_struct(struct gl_shader_parser *glsp,
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struct shader_struct *st, const char *name, const char *storage,
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const char *prefix)
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{
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struct dstr prefix_str;
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size_t i;
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dstr_init(&prefix_str);
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if (prefix)
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dstr_copy(&prefix_str, prefix);
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dstr_cat(&prefix_str, name);
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dstr_cat(&prefix_str, "_");
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for (i = 0; i < st->vars.num; i++) {
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struct shader_var *st_var = st->vars.array+i;
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gl_write_storage_var(glsp, st_var, storage, prefix_str.array);
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}
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dstr_free(&prefix_str);
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}
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static void gl_write_storage_var(struct gl_shader_parser *glsp,
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struct shader_var *var, const char *storage, const char *prefix)
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{
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struct shader_struct *st = shader_parser_getstruct(&glsp->parser,
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var->type);
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if (st) {
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gl_unwrap_storage_struct(glsp, st, var->name, storage, prefix);
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} else {
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struct gl_parser_attrib attrib = {0};
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if (storage) {
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dstr_cat(&glsp->gl_string, storage);
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dstr_cat(&glsp->gl_string, " ");
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}
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if (prefix)
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dstr_cat(&attrib.name, prefix);
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dstr_cat(&attrib.name, var->name);
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gl_write_type(glsp, var->type);
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dstr_cat(&glsp->gl_string, " ");
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dstr_cat_dstr(&glsp->gl_string, &attrib.name);
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dstr_cat(&glsp->gl_string, ";\n");
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attrib.mapping = var->mapping;
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da_push_back(glsp->attribs, &attrib);
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}
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}
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static inline void gl_write_inputs(struct gl_shader_parser *glsp,
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struct shader_func *main)
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{
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size_t i;
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for (i = 0; i < main->params.num; i++)
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gl_write_storage_var(glsp, main->params.array+i, "in",
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"inputval_");
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dstr_cat(&glsp->gl_string, "\n");
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}
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static void gl_write_outputs(struct gl_shader_parser *glsp,
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struct shader_func *main)
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{
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struct shader_var var = {0};
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var.type = main->return_type;
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var.name = "outputval";
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if (main->mapping)
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var.mapping = main->mapping;
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gl_write_storage_var(glsp, &var, "out", NULL);
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dstr_cat(&glsp->gl_string, "\n");
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}
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static void gl_write_struct(struct gl_shader_parser *glsp,
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struct shader_struct *st)
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{
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size_t i;
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dstr_cat(&glsp->gl_string, "struct ");
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dstr_cat(&glsp->gl_string, st->name);
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dstr_cat(&glsp->gl_string, " {\n");
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for (i = 0; i < st->vars.num; i++) {
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struct shader_var *var = st->vars.array+i;
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dstr_cat(&glsp->gl_string, "\t");
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gl_write_var(glsp, var);
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dstr_cat(&glsp->gl_string, ";\n");
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}
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dstr_cat(&glsp->gl_string, "};\n\n");
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}
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static inline void gl_write_structs(struct gl_shader_parser *glsp)
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{
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size_t i;
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for (i = 0; i < glsp->parser.structs.num; i++) {
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struct shader_struct *st = glsp->parser.structs.array+i;
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gl_write_struct(glsp, st);
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}
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}
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/*
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* NOTE: HLSL-> GLSL intrinsic conversions
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* atan2 -> atan
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* clip -> (unsupported)
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* ddx -> dFdx
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* ddy -> dFdy
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* fmod -> (unsupported)
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* frac -> fract
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* lerp -> mix
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* lit -> (unsupported)
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* log10 -> (unsupported)
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* mul -> (change to operator)
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* rsqrt -> inversesqrt
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* saturate -> (use clamp)
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* tex* -> texture
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* tex*grad -> textureGrad
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* tex*lod -> textureLod
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* tex*bias -> (use optional 'bias' value)
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* tex*proj -> textureProj
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*
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* All else can be left as-is
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*/
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static bool gl_write_mul(struct gl_shader_parser *glsp,
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struct cf_token **p_token)
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{
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struct cf_parser *cfp = &glsp->parser.cfp;
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bool written = false;
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cfp->cur_token = *p_token;
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if (!next_token(cfp)) return false;
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if (!token_is(cfp, "(")) return false;
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dstr_cat(&glsp->gl_string, "(");
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gl_write_function_contents(glsp, &cfp->cur_token, ",");
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dstr_cat(&glsp->gl_string, ") * (");
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next_token(cfp);
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gl_write_function_contents(glsp, &cfp->cur_token, ")");
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dstr_cat(&glsp->gl_string, "))");
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*p_token = cfp->cur_token;
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return true;
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}
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static bool gl_write_saturate(struct gl_shader_parser *glsp,
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struct cf_token **p_token)
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{
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struct cf_parser *cfp = &glsp->parser.cfp;
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bool written = false;
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cfp->cur_token = *p_token;
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if (!next_token(cfp)) return false;
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if (!token_is(cfp, "(")) return false;
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dstr_cat(&glsp->gl_string, "clamp");
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gl_write_function_contents(glsp, &cfp->cur_token, ")");
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dstr_cat(&glsp->gl_string, ", 0.0, 1.0)");
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*p_token = cfp->cur_token;
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return true;
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}
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static inline bool gl_write_texture_call(struct gl_shader_parser *glsp,
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struct shader_var *var, const char *call)
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{
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struct cf_parser *cfp = &glsp->parser.cfp;
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size_t sampler_id = -1;
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if (!next_token(cfp)) return false;
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if (!token_is(cfp, "(")) return false;
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if (!next_token(cfp)) return false;
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sampler_id = sp_getsampler(glsp, cfp->cur_token);
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if (sampler_id == -1) return false;
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var->gl_sampler_id = sampler_id;
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dstr_cat(&glsp->gl_string, call);
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dstr_cat(&glsp->gl_string, "(");
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dstr_cat(&glsp->gl_string, var->name);
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dstr_cat(&glsp->gl_string, ", ");
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return true;
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}
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/* processes texture.Sample(sampler, texcoord) */
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static bool gl_write_texture_code(struct gl_shader_parser *glsp,
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struct cf_token **p_token, struct shader_var *var)
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{
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struct cf_parser *cfp = &glsp->parser.cfp;
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bool written = false;
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cfp->cur_token = *p_token;
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if (!next_token(cfp)) return false;
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if (!token_is(cfp, ".")) return false;
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if (!next_token(cfp)) return false;
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if (token_is(cfp, "Sample"))
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written = gl_write_texture_call(glsp, var, "texture");
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else if (token_is(cfp, "SampleBias"))
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written = gl_write_texture_call(glsp, var, "texture");
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else if (token_is(cfp, "SampleGrad"))
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written = gl_write_texture_call(glsp, var, "textureGrad");
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else if (token_is(cfp, "SampleLevel"))
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written = gl_write_texture_call(glsp, var, "textureLod");
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if (!written)
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return false;
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if (!next_token(cfp)) return false;
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gl_write_function_contents(glsp, &cfp->cur_token, ")");
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dstr_cat(&glsp->gl_string, ")");
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*p_token = cfp->cur_token;
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return true;
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}
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static bool gl_write_intrinsic(struct gl_shader_parser *glsp,
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struct cf_token **p_token)
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{
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struct cf_token *token = *p_token;
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bool written = true;
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if (strref_cmp(&token->str, "atan2") == 0) {
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dstr_cat(&glsp->gl_string, "atan2");
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} else if (strref_cmp(&token->str, "ddx") == 0) {
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dstr_cat(&glsp->gl_string, "dFdx");
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} else if (strref_cmp(&token->str, "ddy") == 0) {
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dstr_cat(&glsp->gl_string, "dFdy");
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} else if (strref_cmp(&token->str, "frac") == 0) {
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dstr_cat(&glsp->gl_string, "fract");
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} else if (strref_cmp(&token->str, "lerp") == 0) {
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dstr_cat(&glsp->gl_string, "mix");
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} else if (strref_cmp(&token->str, "rsqrt") == 0) {
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dstr_cat(&glsp->gl_string, "inversesqrt");
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} else if (strref_cmp(&token->str, "saturate") == 0) {
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written = gl_write_saturate(glsp, &token);
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} else if (strref_cmp(&token->str, "mul") == 0) {
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written = gl_write_mul(glsp, &token);
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} else {
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struct shader_var *var = sp_getparam(glsp, token);
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if (var && astrcmp_n(var->type, "texture", 7) == 0)
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written = gl_write_texture_code(glsp, &token, var);
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else
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written = false;
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}
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if (written)
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*p_token = token;
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return written;
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}
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static void gl_write_function_contents(struct gl_shader_parser *glsp,
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struct cf_token **p_token, const char *end)
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{
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struct cf_token *token = *p_token;
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if (token->type != CFTOKEN_NAME
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|| ( !gl_write_type_token(glsp, token)
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&& !gl_write_intrinsic(glsp, &token)))
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dstr_cat_strref(&glsp->gl_string, &token->str);
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while (token->type != CFTOKEN_NONE) {
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token++;
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if (end && strref_cmp(&token->str, end) == 0)
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break;
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if (token->type == CFTOKEN_NAME) {
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if (!gl_write_type_token(glsp, token) &&
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!gl_write_intrinsic(glsp, &token))
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dstr_cat_strref(&glsp->gl_string, &token->str);
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} else if (token->type == CFTOKEN_OTHER) {
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if (*token->str.array == '{')
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gl_write_function_contents(glsp, &token, "}");
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else if (*token->str.array == '(')
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gl_write_function_contents(glsp, &token, ")");
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dstr_cat_strref(&glsp->gl_string, &token->str);
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} else {
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dstr_cat_strref(&glsp->gl_string, &token->str);
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}
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}
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*p_token = token;
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}
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static void gl_write_function(struct gl_shader_parser *glsp,
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struct shader_func *func)
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{
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size_t i;
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struct cf_token *token;
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gl_write_type(glsp, func->return_type);
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dstr_cat(&glsp->gl_string, " ");
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if (strcmp(func->name, "main") == 0)
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dstr_cat(&glsp->gl_string, "obs_main_x");
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else
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dstr_cat(&glsp->gl_string, func->name);
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dstr_cat(&glsp->gl_string, "(");
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for (i = 0; i < func->params.num; i++) {
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struct shader_var *param = func->params.array+i;
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if (i > 0)
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dstr_cat(&glsp->gl_string, ", ");
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gl_write_var(glsp, param);
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}
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dstr_cat(&glsp->gl_string, ")\n");
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token = func->start;
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gl_write_function_contents(glsp, &token, "}");
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dstr_cat(&glsp->gl_string, "}\n\n");
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}
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static inline void gl_write_functions(struct gl_shader_parser *glsp)
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{
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size_t i;
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for (i = 0; i < glsp->parser.funcs.num; i++) {
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struct shader_func *func = glsp->parser.funcs.array+i;
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gl_write_function(glsp, func);
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}
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}
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static void gl_write_main_storage_var(struct gl_shader_parser *glsp,
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struct shader_var *var, const char *dst, const char *src,
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bool input)
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{
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struct shader_struct *st;
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struct dstr dst_copy = {0};
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char ch_left = input ? '.' : '_';
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char ch_right = input ? '_' : '.';
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if (dst) {
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dstr_copy(&dst_copy, dst);
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dstr_cat_ch(&dst_copy, ch_left);
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} else {
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dstr_copy(&dst_copy, "\t");
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}
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dstr_cat(&dst_copy, var->name);
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st = shader_parser_getstruct(&glsp->parser, var->type);
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if (st) {
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struct dstr src_copy = {0};
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size_t i;
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if (src)
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dstr_copy(&src_copy, src);
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dstr_cat(&src_copy, var->name);
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dstr_cat_ch(&src_copy, ch_right);
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for (i = 0; i < st->vars.num; i++) {
|
|
struct shader_var *var = st->vars.array+i;
|
|
gl_write_main_storage_var(glsp, var, dst_copy.array,
|
|
src_copy.array, input);
|
|
}
|
|
|
|
dstr_free(&src_copy);
|
|
} else {
|
|
if (!dstr_isempty(&dst_copy))
|
|
dstr_cat_dstr(&glsp->gl_string, &dst_copy);
|
|
dstr_cat(&glsp->gl_string, " = ");
|
|
if (src)
|
|
dstr_cat(&glsp->gl_string, src);
|
|
dstr_cat(&glsp->gl_string, var->name);
|
|
dstr_cat(&glsp->gl_string, ";\n");
|
|
}
|
|
|
|
dstr_free(&dst_copy);
|
|
}
|
|
|
|
static void gl_write_main_storage_output(struct gl_shader_parser *glsp,
|
|
bool input, const char *type)
|
|
{
|
|
struct shader_var var = {0};
|
|
|
|
if (input) {
|
|
var.name = "inputval";
|
|
var.type = (char*)type;
|
|
gl_write_main_storage_var(glsp, &var, NULL, NULL, true);
|
|
} else {
|
|
var.name = "outputval";
|
|
var.type = (char*)type;
|
|
gl_write_main_storage_var(glsp, &var, NULL, NULL, false);
|
|
}
|
|
}
|
|
|
|
static void gl_write_main(struct gl_shader_parser *glsp,
|
|
struct shader_func *main)
|
|
{
|
|
size_t i;
|
|
dstr_cat(&glsp->gl_string, "void main(void)\n{\n");
|
|
for (i = 0; i < main->params.num; i++) {
|
|
dstr_cat(&glsp->gl_string, "\t");
|
|
dstr_cat(&glsp->gl_string, main->params.array[i].type);
|
|
dstr_cat(&glsp->gl_string, " ");
|
|
dstr_cat(&glsp->gl_string, main->params.array[i].name);
|
|
dstr_cat(&glsp->gl_string, ";\n");
|
|
}
|
|
|
|
if (!main->mapping) {
|
|
dstr_cat(&glsp->gl_string, "\t");
|
|
dstr_cat(&glsp->gl_string, main->return_type);
|
|
dstr_cat(&glsp->gl_string, " outputval;\n\n");
|
|
}
|
|
|
|
/* gl_write_main_storage(glsp, true, main->params.array[0].type); */
|
|
gl_write_main_storage_var(glsp, main->params.array, NULL,
|
|
"inputval_", true);
|
|
|
|
dstr_cat(&glsp->gl_string, "\n\toutputval = obs_main_x(");
|
|
for (i = 0; i < main->params.num; i++) {
|
|
if (i)
|
|
dstr_cat(&glsp->gl_string, ", ");
|
|
dstr_cat(&glsp->gl_string, main->params.array[i].name);
|
|
}
|
|
dstr_cat(&glsp->gl_string, ");\n");
|
|
|
|
if (!main->mapping) {
|
|
dstr_cat(&glsp->gl_string, "\n");
|
|
gl_write_main_storage_output(glsp, false, main->return_type);
|
|
}
|
|
|
|
dstr_cat(&glsp->gl_string, "}\n");
|
|
}
|
|
|
|
static bool gl_shader_buildstring(struct gl_shader_parser *glsp)
|
|
{
|
|
struct shader_func *main = shader_parser_getfunc(&glsp->parser, "main");
|
|
if (!main) {
|
|
blog(LOG_ERROR, "function 'main' not found");
|
|
return false;
|
|
}
|
|
|
|
dstr_copy(&glsp->gl_string, "#version 140\n\n");
|
|
gl_write_params(glsp);
|
|
gl_write_inputs(glsp, main);
|
|
gl_write_outputs(glsp, main);
|
|
gl_write_structs(glsp);
|
|
gl_write_functions(glsp);
|
|
gl_write_main(glsp, main);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool gl_shader_parse(struct gl_shader_parser *glsp,
|
|
const char *shader_str, const char *file)
|
|
{
|
|
bool success = shader_parse(&glsp->parser, shader_str, file);
|
|
char *str = shader_parser_geterrors(&glsp->parser);
|
|
if (str) {
|
|
blog(LOG_WARNING, "Shader parser errors/warnings:\n%s\n", str);
|
|
bfree(str);
|
|
}
|
|
|
|
if (success)
|
|
success = gl_shader_buildstring(glsp);
|
|
|
|
return success;
|
|
}
|