504 lines
17 KiB
C
504 lines
17 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#ifndef _LANGUAGE_C
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#define _LANGUAGE_C
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#endif
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#include <PR/gbi.h>
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#ifdef __MINGW32__
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#define FOR_WINDOWS 1
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#else
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#define FOR_WINDOWS 0
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#endif
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#if FOR_WINDOWS
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#define GLEW_STATIC
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#include <GL/glew.h>
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#include <SDL2/SDL.h>
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#define GL_GLEXT_PROTOTYPES 1
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#include <SDL2/SDL_opengl.h>
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#else
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#include <SDL2/SDL.h>
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#define GL_GLEXT_PROTOTYPES 1
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#include <SDL2/SDL_opengles2.h>
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#endif
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#include "gfx_cc.h"
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#include "gfx_rendering_api.h"
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struct ShaderProgram {
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uint32_t shader_id;
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GLuint opengl_program_id;
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uint8_t num_inputs;
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bool used_textures[2];
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uint8_t num_floats;
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GLint attrib_locations[7];
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uint8_t attrib_sizes[7];
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uint8_t num_attribs;
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};
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static struct ShaderProgram shader_program_pool[64];
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static uint8_t shader_program_pool_size;
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static GLuint opengl_vbo;
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static bool gfx_opengl_z_is_from_0_to_1(void) {
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return false;
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}
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static void gfx_opengl_vertex_array_set_attribs(struct ShaderProgram *prg) {
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size_t num_floats = prg->num_floats;
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size_t pos = 0;
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for (int i = 0; i < prg->num_attribs; i++) {
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glEnableVertexAttribArray(prg->attrib_locations[i]);
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glVertexAttribPointer(prg->attrib_locations[i], prg->attrib_sizes[i], GL_FLOAT, GL_FALSE, num_floats * sizeof(float), (void *)(pos * sizeof(float)));
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pos += prg->attrib_sizes[i];
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}
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}
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static void gfx_opengl_unload_shader(struct ShaderProgram *old_prg) {
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if (old_prg != NULL) {
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for (int i = 0; i < old_prg->num_attribs; i++) {
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glDisableVertexAttribArray(old_prg->attrib_locations[i]);
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}
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}
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}
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static void gfx_opengl_load_shader(struct ShaderProgram *new_prg) {
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glUseProgram(new_prg->opengl_program_id);
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gfx_opengl_vertex_array_set_attribs(new_prg);
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}
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static void append_str(char *buf, size_t *len, const char *str) {
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while (*str != '\0') buf[(*len)++] = *str++;
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}
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static void append_line(char *buf, size_t *len, const char *str) {
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while (*str != '\0') buf[(*len)++] = *str++;
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buf[(*len)++] = '\n';
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}
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static const char *shader_item_to_str(uint32_t item, bool with_alpha, bool only_alpha, bool inputs_have_alpha, bool hint_single_element) {
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if (!only_alpha) {
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switch (item) {
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case SHADER_0:
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return with_alpha ? "vec4(0.0, 0.0, 0.0, 0.0)" : "vec3(0.0, 0.0, 0.0)";
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case SHADER_INPUT_1:
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return with_alpha || !inputs_have_alpha ? "vInput1" : "vInput1.rgb";
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case SHADER_INPUT_2:
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return with_alpha || !inputs_have_alpha ? "vInput2" : "vInput2.rgb";
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case SHADER_INPUT_3:
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return with_alpha || !inputs_have_alpha ? "vInput3" : "vInput3.rgb";
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case SHADER_INPUT_4:
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return with_alpha || !inputs_have_alpha ? "vInput4" : "vInput4.rgb";
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case SHADER_TEXEL0:
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return with_alpha ? "texVal0" : "texVal0.rgb";
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case SHADER_TEXEL0A:
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return hint_single_element ? "texVal0.a" :
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(with_alpha ? "vec4(texelVal0.a, texelVal0.a, texelVal0.a, texelVal0.a)" : "vec3(texelVal0.a, texelVal0.a, texelVal0.a)");
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case SHADER_TEXEL1:
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return with_alpha ? "texVal1" : "texVal1.rgb";
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}
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} else {
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switch (item) {
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case SHADER_0:
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return "0.0";
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case SHADER_INPUT_1:
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return "vInput1.a";
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case SHADER_INPUT_2:
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return "vInput2.a";
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case SHADER_INPUT_3:
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return "vInput3.a";
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case SHADER_INPUT_4:
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return "vInput4.a";
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case SHADER_TEXEL0:
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return "texVal0.a";
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case SHADER_TEXEL0A:
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return "texVal0.a";
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case SHADER_TEXEL1:
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return "texVal1.a";
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}
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}
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}
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static void append_formula(char *buf, size_t *len, uint8_t c[2][4], bool do_single, bool do_multiply, bool do_mix, bool with_alpha, bool only_alpha, bool opt_alpha) {
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if (do_single) {
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append_str(buf, len, shader_item_to_str(c[only_alpha][3], with_alpha, only_alpha, opt_alpha, false));
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} else if (do_multiply) {
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append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
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append_str(buf, len, " * ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
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} else if (do_mix) {
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append_str(buf, len, "mix(");
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append_str(buf, len, shader_item_to_str(c[only_alpha][1], with_alpha, only_alpha, opt_alpha, false));
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append_str(buf, len, ", ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
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append_str(buf, len, ", ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
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append_str(buf, len, ")");
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} else {
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append_str(buf, len, "(");
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append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
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append_str(buf, len, " - ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][1], with_alpha, only_alpha, opt_alpha, false));
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append_str(buf, len, ") * ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
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append_str(buf, len, " + ");
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append_str(buf, len, shader_item_to_str(c[only_alpha][3], with_alpha, only_alpha, opt_alpha, false));
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}
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}
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static struct ShaderProgram *gfx_opengl_create_and_load_new_shader(uint32_t shader_id) {
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uint8_t c[2][4];
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for (int i = 0; i < 4; i++) {
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c[0][i] = (shader_id >> (i * 3)) & 7;
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c[1][i] = (shader_id >> (12 + i * 3)) & 7;
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}
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bool opt_alpha = (shader_id & SHADER_OPT_ALPHA) != 0;
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bool opt_fog = (shader_id & SHADER_OPT_FOG) != 0;
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bool opt_texture_edge = (shader_id & SHADER_OPT_TEXTURE_EDGE) != 0;
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bool used_textures[2] = {0, 0};
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int num_inputs = 0;
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for (int i = 0; i < 2; i++) {
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for (int j = 0; j < 4; j++) {
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if (c[i][j] >= SHADER_INPUT_1 && c[i][j] <= SHADER_INPUT_4) {
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if (c[i][j] > num_inputs) {
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num_inputs = c[i][j];
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}
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}
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if (c[i][j] == SHADER_TEXEL0 || c[i][j] == SHADER_TEXEL0A) {
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used_textures[0] = true;
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}
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if (c[i][j] == SHADER_TEXEL1) {
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used_textures[1] = true;
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}
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}
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}
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bool do_single[2] = {c[0][2] == 0, c[1][2] == 0};
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bool do_multiply[2] = {c[0][1] == 0 && c[0][3] == 0, c[1][1] == 0 && c[1][3] == 0};
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bool do_mix[2] = {c[0][1] == c[0][3], c[1][1] == c[1][3]};
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bool color_alpha_same = (shader_id & 0xfff) == ((shader_id >> 12) & 0xfff);
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char vs_buf[1024];
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char fs_buf[1024];
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size_t vs_len = 0;
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size_t fs_len = 0;
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size_t num_floats = 4;
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// Vertex shader
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append_line(vs_buf, &vs_len, "#version 100");
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append_line(vs_buf, &vs_len, "attribute vec4 aVtxPos;");
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if (used_textures[0] || used_textures[1]) {
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append_line(vs_buf, &vs_len, "attribute vec2 aTexCoord;");
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append_line(vs_buf, &vs_len, "varying vec2 vTexCoord;");
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num_floats += 2;
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}
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if (opt_fog) {
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append_line(vs_buf, &vs_len, "attribute vec4 aFog;");
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append_line(vs_buf, &vs_len, "varying vec4 vFog;");
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num_floats += 4;
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}
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for (int i = 0; i < num_inputs; i++) {
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vs_len += sprintf(vs_buf + vs_len, "attribute vec%d aInput%d;\n", opt_alpha ? 4 : 3, i + 1);
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vs_len += sprintf(vs_buf + vs_len, "varying vec%d vInput%d;\n", opt_alpha ? 4 : 3, i + 1);
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num_floats += opt_alpha ? 4 : 3;
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}
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append_line(vs_buf, &vs_len, "void main() {");
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if (used_textures[0] || used_textures[1]) {
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append_line(vs_buf, &vs_len, "vTexCoord = aTexCoord;");
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}
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if (opt_fog) {
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append_line(vs_buf, &vs_len, "vFog = aFog;");
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}
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for (int i = 0; i < num_inputs; i++) {
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vs_len += sprintf(vs_buf + vs_len, "vInput%d = aInput%d;\n", i + 1, i + 1);
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}
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append_line(vs_buf, &vs_len, "gl_Position = aVtxPos;");
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append_line(vs_buf, &vs_len, "}");
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// Fragment shader
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append_line(fs_buf, &fs_len, "#version 100");
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append_line(fs_buf, &fs_len, "precision mediump float;");
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if (used_textures[0] || used_textures[1]) {
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append_line(fs_buf, &fs_len, "varying vec2 vTexCoord;");
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}
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if (opt_fog) {
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append_line(fs_buf, &fs_len, "varying vec4 vFog;");
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}
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for (int i = 0; i < num_inputs; i++) {
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fs_len += sprintf(fs_buf + fs_len, "varying vec%d vInput%d;\n", opt_alpha ? 4 : 3, i + 1);
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}
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if (used_textures[0]) {
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append_line(fs_buf, &fs_len, "uniform sampler2D uTex0;");
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}
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if (used_textures[1]) {
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append_line(fs_buf, &fs_len, "uniform sampler2D uTex1;");
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}
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append_line(fs_buf, &fs_len, "void main() {");
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if (used_textures[0]) {
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append_line(fs_buf, &fs_len, "vec4 texVal0 = texture2D(uTex0, vTexCoord);");
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}
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if (used_textures[1]) {
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append_line(fs_buf, &fs_len, "vec4 texVal1 = texture2D(uTex1, vTexCoord);");
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}
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append_str(fs_buf, &fs_len, opt_alpha ? "vec4 texel = " : "vec3 texel = ");
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if (!color_alpha_same && opt_alpha) {
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append_str(fs_buf, &fs_len, "vec4(");
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append_formula(fs_buf, &fs_len, c, do_single[0], do_multiply[0], do_mix[0], false, false, true);
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append_str(fs_buf, &fs_len, ", ");
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append_formula(fs_buf, &fs_len, c, do_single[1], do_multiply[1], do_mix[1], true, true, true);
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append_str(fs_buf, &fs_len, ")");
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} else {
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append_formula(fs_buf, &fs_len, c, do_single[0], do_multiply[0], do_mix[0], opt_alpha, false, opt_alpha);
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}
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append_line(fs_buf, &fs_len, ";");
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if (opt_texture_edge && opt_alpha) {
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append_line(fs_buf, &fs_len, "if (texel.a > 0.3) texel.a = 1.0; else discard;");
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}
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// TODO discard if alpha is 0?
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if (opt_fog) {
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if (opt_alpha) {
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append_line(fs_buf, &fs_len, "texel = vec4(mix(texel.rgb, vFog.rgb, vFog.a), texel.a);");
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} else {
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append_line(fs_buf, &fs_len, "texel = mix(texel, vFog.rgb, vFog.a);");
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}
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}
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if (opt_alpha) {
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append_line(fs_buf, &fs_len, "gl_FragColor = texel;");
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} else {
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append_line(fs_buf, &fs_len, "gl_FragColor = vec4(texel, 1.0);");
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}
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append_line(fs_buf, &fs_len, "}");
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vs_buf[vs_len] = '\0';
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fs_buf[fs_len] = '\0';
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/*puts("Vertex shader:");
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puts(vs_buf);
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puts("Fragment shader:");
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puts(fs_buf);
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puts("End");*/
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const GLchar *sources[2] = {vs_buf, fs_buf};
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const GLint lengths[2] = {vs_len, fs_len};
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GLint success;
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GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex_shader, 1, &sources[0], &lengths[0]);
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glCompileShader(vertex_shader);
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glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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GLint max_length = 0;
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glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &max_length);
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char error_log[1024];
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fprintf(stderr, "Vertex shader compilation failed\n");
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glGetShaderInfoLog(vertex_shader, max_length, &max_length, &error_log[0]);
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fprintf(stderr, "%s\n", &error_log[0]);
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abort();
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}
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GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment_shader, 1, &sources[1], &lengths[1]);
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glCompileShader(fragment_shader);
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glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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GLint max_length = 0;
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glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &max_length);
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char error_log[1024];
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fprintf(stderr, "Fragment shader compilation failed\n");
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glGetShaderInfoLog(fragment_shader, max_length, &max_length, &error_log[0]);
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fprintf(stderr, "%s\n", &error_log[0]);
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abort();
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}
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GLuint shader_program = glCreateProgram();
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glAttachShader(shader_program, vertex_shader);
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glAttachShader(shader_program, fragment_shader);
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glLinkProgram(shader_program);
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size_t cnt = 0;
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struct ShaderProgram *prg = &shader_program_pool[shader_program_pool_size++];
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prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aVtxPos");
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prg->attrib_sizes[cnt] = 4;
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++cnt;
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if (used_textures[0] || used_textures[1]) {
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prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aTexCoord");
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prg->attrib_sizes[cnt] = 2;
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++cnt;
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}
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if (opt_fog) {
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prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aFog");
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prg->attrib_sizes[cnt] = 4;
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++cnt;
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}
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for (int i = 0; i < num_inputs; i++) {
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char name[16];
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sprintf(name, "aInput%d", i + 1);
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prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, name);
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prg->attrib_sizes[cnt] = opt_alpha ? 4 : 3;
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++cnt;
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}
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prg->shader_id = shader_id;
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prg->opengl_program_id = shader_program;
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prg->num_inputs = num_inputs;
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prg->used_textures[0] = used_textures[0];
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prg->used_textures[1] = used_textures[1];
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prg->num_floats = num_floats;
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prg->num_attribs = cnt;
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gfx_opengl_load_shader(prg);
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if (used_textures[0]) {
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GLint sampler_attrib = glGetUniformLocation(shader_program, "uTex0");
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glUniform1i(sampler_attrib, 0);
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}
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if (used_textures[1]) {
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GLint sampler_attrib = glGetUniformLocation(shader_program, "uTex1");
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glUniform1i(sampler_attrib, 1);
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}
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return prg;
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}
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static struct ShaderProgram *gfx_opengl_lookup_shader(uint32_t shader_id) {
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for (size_t i = 0; i < shader_program_pool_size; i++) {
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if (shader_program_pool[i].shader_id == shader_id) {
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return &shader_program_pool[i];
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}
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}
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return NULL;
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}
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static void gfx_opengl_shader_get_info(struct ShaderProgram *prg, uint8_t *num_inputs, bool used_textures[2]) {
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*num_inputs = prg->num_inputs;
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used_textures[0] = prg->used_textures[0];
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used_textures[1] = prg->used_textures[1];
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}
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static GLuint gfx_opengl_new_texture(void) {
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GLuint ret;
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glGenTextures(1, &ret);
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return ret;
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}
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static void gfx_opengl_select_texture(int tile, GLuint texture_id) {
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glActiveTexture(GL_TEXTURE0 + tile);
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glBindTexture(GL_TEXTURE_2D, texture_id);
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}
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static void gfx_opengl_upload_texture(uint8_t *rgba32_buf, int width, int height) {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba32_buf);
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}
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static uint32_t gfx_cm_to_opengl(uint32_t val) {
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if (val & G_TX_CLAMP) {
|
|
return GL_CLAMP_TO_EDGE;
|
|
}
|
|
return (val & G_TX_MIRROR) ? GL_MIRRORED_REPEAT : GL_REPEAT;
|
|
}
|
|
|
|
static void gfx_opengl_set_sampler_parameters(int tile, bool linear_filter, uint32_t cms, uint32_t cmt) {
|
|
glActiveTexture(GL_TEXTURE0 + tile);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, linear_filter ? GL_LINEAR : GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, linear_filter ? GL_LINEAR : GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, gfx_cm_to_opengl(cms));
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, gfx_cm_to_opengl(cmt));
|
|
}
|
|
|
|
static void gfx_opengl_set_depth_test(bool depth_test) {
|
|
if (depth_test) {
|
|
glEnable(GL_DEPTH_TEST);
|
|
} else {
|
|
glDisable(GL_DEPTH_TEST);
|
|
}
|
|
}
|
|
|
|
static void gfx_opengl_set_depth_mask(bool z_upd) {
|
|
glDepthMask(z_upd ? GL_TRUE : GL_FALSE);
|
|
}
|
|
|
|
static void gfx_opengl_set_zmode_decal(bool zmode_decal) {
|
|
if (zmode_decal) {
|
|
glPolygonOffset(-2, -2);
|
|
glEnable(GL_POLYGON_OFFSET_FILL);
|
|
} else {
|
|
glPolygonOffset(0, 0);
|
|
glDisable(GL_POLYGON_OFFSET_FILL);
|
|
}
|
|
}
|
|
|
|
static void gfx_opengl_set_viewport(int x, int y, int width, int height) {
|
|
glViewport(x, y, width, height);
|
|
}
|
|
|
|
static void gfx_opengl_set_scissor(int x, int y, int width, int height) {
|
|
glScissor(x, y, width, height);
|
|
}
|
|
|
|
static void gfx_opengl_set_use_alpha(bool use_alpha) {
|
|
if (use_alpha) {
|
|
glEnable(GL_BLEND);
|
|
} else {
|
|
glDisable(GL_BLEND);
|
|
}
|
|
}
|
|
|
|
static void gfx_opengl_draw_triangles(float buf_vbo[], size_t buf_vbo_len, size_t buf_vbo_num_tris) {
|
|
//printf("flushing %d tris\n", buf_vbo_num_tris);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float) * buf_vbo_len, buf_vbo, GL_STREAM_DRAW);
|
|
glDrawArrays(GL_TRIANGLES, 0, 3 * buf_vbo_num_tris);
|
|
}
|
|
|
|
static void gfx_opengl_init(void) {
|
|
#if FOR_WINDOWS
|
|
glewInit();
|
|
#endif
|
|
|
|
glGenBuffers(1, &opengl_vbo);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, opengl_vbo);
|
|
|
|
glDepthFunc(GL_LEQUAL);
|
|
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
|
}
|
|
|
|
static void gfx_opengl_start_frame(void) {
|
|
glDisable(GL_SCISSOR_TEST);
|
|
glDepthMask(GL_TRUE); // Must be set to clear Z-buffer
|
|
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
glEnable(GL_SCISSOR_TEST);
|
|
}
|
|
|
|
struct GfxRenderingAPI gfx_opengl_api = {
|
|
gfx_opengl_z_is_from_0_to_1,
|
|
gfx_opengl_unload_shader,
|
|
gfx_opengl_load_shader,
|
|
gfx_opengl_create_and_load_new_shader,
|
|
gfx_opengl_lookup_shader,
|
|
gfx_opengl_shader_get_info,
|
|
gfx_opengl_new_texture,
|
|
gfx_opengl_select_texture,
|
|
gfx_opengl_upload_texture,
|
|
gfx_opengl_set_sampler_parameters,
|
|
gfx_opengl_set_depth_test,
|
|
gfx_opengl_set_depth_mask,
|
|
gfx_opengl_set_zmode_decal,
|
|
gfx_opengl_set_viewport,
|
|
gfx_opengl_set_scissor,
|
|
gfx_opengl_set_use_alpha,
|
|
gfx_opengl_draw_triangles,
|
|
gfx_opengl_init,
|
|
gfx_opengl_start_frame
|
|
};
|