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sm64pc/src/pc/gfx/gfx_opengl.c

681 lines
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C
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#ifdef RAPI_GL
#include <stdint.h>
#include <stdbool.h>
#ifndef _LANGUAGE_C
# define _LANGUAGE_C
#endif
#include <PR/gbi.h>
#ifdef __MINGW32__
# define FOR_WINDOWS 1
#else
# define FOR_WINDOWS 0
#endif
#if FOR_WINDOWS || defined(OSX_BUILD)
# define GLEW_STATIC
# include <GL/glew.h>
#endif
#include <SDL2/SDL.h>
#define GL_GLEXT_PROTOTYPES 1
#ifdef USE_GLES
# include <SDL2/SDL_opengles2.h>
#else
# include <SDL2/SDL_opengl.h>
#endif
#include "../platform.h"
#include "../configfile.h"
#include "gfx_cc.h"
#include "gfx_rendering_api.h"
#define TEX_CACHE_STEP 512
struct ShaderProgram {
uint32_t shader_id;
GLuint opengl_program_id;
uint8_t num_inputs;
bool used_textures[2];
uint8_t num_floats;
GLint attrib_locations[7];
GLint uniform_locations[6];
uint8_t attrib_sizes[7];
uint8_t num_attribs;
bool used_noise;
};
struct GLTexture {
GLuint gltex;
GLfloat size[2];
bool filter;
};
static struct ShaderProgram shader_program_pool[64];
static uint8_t shader_program_pool_size;
static GLuint opengl_vbo;
static int tex_cache_size = 0;
static int num_textures = 0;
static struct GLTexture *tex_cache = NULL;
static struct ShaderProgram *opengl_prg = NULL;
static struct GLTexture *opengl_tex[2];
static int opengl_curtex = 0;
static uint32_t frame_count;
static uint32_t current_height;
static bool gfx_opengl_z_is_from_0_to_1(void) {
return false;
}
static void gfx_opengl_vertex_array_set_attribs(struct ShaderProgram *prg) {
size_t num_floats = prg->num_floats;
size_t pos = 0;
for (int i = 0; i < prg->num_attribs; i++) {
glEnableVertexAttribArray(prg->attrib_locations[i]);
glVertexAttribPointer(prg->attrib_locations[i], prg->attrib_sizes[i], GL_FLOAT, GL_FALSE, num_floats * sizeof(float), (void *) (pos * sizeof(float)));
pos += prg->attrib_sizes[i];
}
}
static inline void gfx_opengl_set_shader_uniforms(struct ShaderProgram *prg) {
if (prg->used_noise) {
glUniform1i(prg->uniform_locations[4], frame_count);
glUniform1i(prg->uniform_locations[5], current_height);
}
}
static inline void gfx_opengl_set_texture_uniforms(struct ShaderProgram *prg, const int tile) {
if (prg->used_textures[tile] && opengl_tex[tile]) {
glUniform2f(prg->uniform_locations[tile*2 + 0], opengl_tex[tile]->size[0], opengl_tex[tile]->size[1]);
glUniform1i(prg->uniform_locations[tile*2 + 1], opengl_tex[tile]->filter);
}
}
static void gfx_opengl_unload_shader(struct ShaderProgram *old_prg) {
if (old_prg != NULL) {
for (int i = 0; i < old_prg->num_attribs; i++)
glDisableVertexAttribArray(old_prg->attrib_locations[i]);
if (old_prg == opengl_prg)
opengl_prg = NULL;
} else {
opengl_prg = NULL;
}
}
static void gfx_opengl_load_shader(struct ShaderProgram *new_prg) {
opengl_prg = new_prg;
glUseProgram(new_prg->opengl_program_id);
gfx_opengl_vertex_array_set_attribs(new_prg);
gfx_opengl_set_shader_uniforms(new_prg);
gfx_opengl_set_texture_uniforms(new_prg, 0);
gfx_opengl_set_texture_uniforms(new_prg, 1);
}
static void append_str(char *buf, size_t *len, const char *str) {
while (*str != '\0') buf[(*len)++] = *str++;
}
static void append_line(char *buf, size_t *len, const char *str) {
while (*str != '\0') buf[(*len)++] = *str++;
buf[(*len)++] = '\n';
}
static const char *shader_item_to_str(uint32_t item, bool with_alpha, bool only_alpha, bool inputs_have_alpha, bool hint_single_element) {
if (!only_alpha) {
switch (item) {
case SHADER_0:
return with_alpha ? "vec4(0.0, 0.0, 0.0, 0.0)" : "vec3(0.0, 0.0, 0.0)";
case SHADER_INPUT_1:
return with_alpha || !inputs_have_alpha ? "vInput1" : "vInput1.rgb";
case SHADER_INPUT_2:
return with_alpha || !inputs_have_alpha ? "vInput2" : "vInput2.rgb";
case SHADER_INPUT_3:
return with_alpha || !inputs_have_alpha ? "vInput3" : "vInput3.rgb";
case SHADER_INPUT_4:
return with_alpha || !inputs_have_alpha ? "vInput4" : "vInput4.rgb";
case SHADER_TEXEL0:
return with_alpha ? "texVal0" : "texVal0.rgb";
case SHADER_TEXEL0A:
return hint_single_element ? "texVal0.a" :
(with_alpha ? "vec4(texelVal0.a, texelVal0.a, texelVal0.a, texelVal0.a)" : "vec3(texelVal0.a, texelVal0.a, texelVal0.a)");
case SHADER_TEXEL1:
return with_alpha ? "texVal1" : "texVal1.rgb";
}
} else {
switch (item) {
case SHADER_0:
return "0.0";
case SHADER_INPUT_1:
return "vInput1.a";
case SHADER_INPUT_2:
return "vInput2.a";
case SHADER_INPUT_3:
return "vInput3.a";
case SHADER_INPUT_4:
return "vInput4.a";
case SHADER_TEXEL0:
return "texVal0.a";
case SHADER_TEXEL0A:
return "texVal0.a";
case SHADER_TEXEL1:
return "texVal1.a";
}
}
}
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) {
if (do_single) {
append_str(buf, len, shader_item_to_str(c[only_alpha][3], with_alpha, only_alpha, opt_alpha, false));
} else if (do_multiply) {
append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
append_str(buf, len, " * ");
append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
} else if (do_mix) {
append_str(buf, len, "mix(");
append_str(buf, len, shader_item_to_str(c[only_alpha][1], with_alpha, only_alpha, opt_alpha, false));
append_str(buf, len, ", ");
append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
append_str(buf, len, ", ");
append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
append_str(buf, len, ")");
} else {
append_str(buf, len, "(");
append_str(buf, len, shader_item_to_str(c[only_alpha][0], with_alpha, only_alpha, opt_alpha, false));
append_str(buf, len, " - ");
append_str(buf, len, shader_item_to_str(c[only_alpha][1], with_alpha, only_alpha, opt_alpha, false));
append_str(buf, len, ") * ");
append_str(buf, len, shader_item_to_str(c[only_alpha][2], with_alpha, only_alpha, opt_alpha, true));
append_str(buf, len, " + ");
append_str(buf, len, shader_item_to_str(c[only_alpha][3], with_alpha, only_alpha, opt_alpha, false));
}
}
static struct ShaderProgram *gfx_opengl_create_and_load_new_shader(uint32_t shader_id) {
uint8_t c[2][4];
for (int i = 0; i < 4; i++) {
c[0][i] = (shader_id >> (i * 3)) & 7;
c[1][i] = (shader_id >> (12 + i * 3)) & 7;
}
bool opt_alpha = (shader_id & SHADER_OPT_ALPHA) != 0;
bool opt_fog = (shader_id & SHADER_OPT_FOG) != 0;
bool opt_texture_edge = (shader_id & SHADER_OPT_TEXTURE_EDGE) != 0;
#ifdef USE_GLES
bool opt_noise = false;
#else
bool opt_noise = (shader_id & SHADER_OPT_NOISE) != 0;
#endif
bool used_textures[2] = { 0, 0 };
int num_inputs = 0;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 4; j++) {
if (c[i][j] >= SHADER_INPUT_1 && c[i][j] <= SHADER_INPUT_4) {
if (c[i][j] > num_inputs) {
num_inputs = c[i][j];
}
}
if (c[i][j] == SHADER_TEXEL0 || c[i][j] == SHADER_TEXEL0A) {
used_textures[0] = true;
}
if (c[i][j] == SHADER_TEXEL1) {
used_textures[1] = true;
}
}
}
bool do_single[2] = { c[0][2] == 0, c[1][2] == 0 };
bool do_multiply[2] = { c[0][1] == 0 && c[0][3] == 0, c[1][1] == 0 && c[1][3] == 0 };
bool do_mix[2] = { c[0][1] == c[0][3], c[1][1] == c[1][3] };
bool color_alpha_same = (shader_id & 0xfff) == ((shader_id >> 12) & 0xfff);
char vs_buf[1024];
char fs_buf[2048];
size_t vs_len = 0;
size_t fs_len = 0;
size_t num_floats = 4;
// Vertex shader
#ifdef USE_GLES
append_line(vs_buf, &vs_len, "#version 100");
#else
append_line(vs_buf, &vs_len, "#version 120");
#endif
append_line(vs_buf, &vs_len, "attribute vec4 aVtxPos;");
if (used_textures[0] || used_textures[1]) {
append_line(vs_buf, &vs_len, "attribute vec2 aTexCoord;");
append_line(vs_buf, &vs_len, "varying vec2 vTexCoord;");
num_floats += 2;
}
if (opt_fog) {
append_line(vs_buf, &vs_len, "attribute vec4 aFog;");
append_line(vs_buf, &vs_len, "varying vec4 vFog;");
num_floats += 4;
}
for (int i = 0; i < num_inputs; i++) {
vs_len += sprintf(vs_buf + vs_len, "attribute vec%d aInput%d;\n", opt_alpha ? 4 : 3, i + 1);
vs_len += sprintf(vs_buf + vs_len, "varying vec%d vInput%d;\n", opt_alpha ? 4 : 3, i + 1);
num_floats += opt_alpha ? 4 : 3;
}
append_line(vs_buf, &vs_len, "void main() {");
if (used_textures[0] || used_textures[1]) {
append_line(vs_buf, &vs_len, "vTexCoord = aTexCoord;");
}
if (opt_fog) {
append_line(vs_buf, &vs_len, "vFog = aFog;");
}
for (int i = 0; i < num_inputs; i++) {
vs_len += sprintf(vs_buf + vs_len, "vInput%d = aInput%d;\n", i + 1, i + 1);
}
append_line(vs_buf, &vs_len, "gl_Position = aVtxPos;");
append_line(vs_buf, &vs_len, "}");
// Fragment shader
#ifdef USE_GLES
append_line(fs_buf, &fs_len, "#version 100");
append_line(fs_buf, &fs_len, "precision mediump float;");
#else
append_line(fs_buf, &fs_len, "#version 120");
#endif
if (used_textures[0] || used_textures[1]) {
append_line(fs_buf, &fs_len, "varying vec2 vTexCoord;");
}
if (opt_fog) {
append_line(fs_buf, &fs_len, "varying vec4 vFog;");
}
for (int i = 0; i < num_inputs; i++) {
fs_len += sprintf(fs_buf + fs_len, "varying vec%d vInput%d;\n", opt_alpha ? 4 : 3, i + 1);
}
if (used_textures[0]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTex0;");
append_line(fs_buf, &fs_len, "uniform vec2 uTex0Size;");
append_line(fs_buf, &fs_len, "uniform bool uTex0Filter;");
}
if (used_textures[1]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTex1;");
append_line(fs_buf, &fs_len, "uniform vec2 uTex1Size;");
append_line(fs_buf, &fs_len, "uniform bool uTex1Filter;");
}
// 3 point texture filtering
// Original author: ArthurCarvalho
// Slightly modified GLSL implementation by twinaphex, mupen64plus-libretro project.
if (used_textures[0] || used_textures[1]) {
if (configFiltering == 2) {
append_line(fs_buf, &fs_len, "#define TEX_OFFSET(off) texture2D(tex, texCoord - (off)/texSize)");
append_line(fs_buf, &fs_len, "vec4 filter3point(in sampler2D tex, in vec2 texCoord, in vec2 texSize) {");
append_line(fs_buf, &fs_len, " vec2 offset = fract(texCoord*texSize - vec2(0.5));");
append_line(fs_buf, &fs_len, " offset -= step(1.0, offset.x + offset.y);");
append_line(fs_buf, &fs_len, " vec4 c0 = TEX_OFFSET(offset);");
append_line(fs_buf, &fs_len, " vec4 c1 = TEX_OFFSET(vec2(offset.x - sign(offset.x), offset.y));");
append_line(fs_buf, &fs_len, " vec4 c2 = TEX_OFFSET(vec2(offset.x, offset.y - sign(offset.y)));");
append_line(fs_buf, &fs_len, " return c0 + abs(offset.x)*(c1-c0) + abs(offset.y)*(c2-c0);");
append_line(fs_buf, &fs_len, "}");
append_line(fs_buf, &fs_len, "vec4 sampleTex(in sampler2D tex, in vec2 uv, in vec2 texSize, in bool filter) {");
append_line(fs_buf, &fs_len, "if (filter)");
append_line(fs_buf, &fs_len, "return filter3point(tex, uv, texSize);");
append_line(fs_buf, &fs_len, "else");
append_line(fs_buf, &fs_len, "return texture2D(tex, uv);");
append_line(fs_buf, &fs_len, "}");
} else {
append_line(fs_buf, &fs_len, "vec4 sampleTex(in sampler2D tex, in vec2 uv, in vec2 texSize, in bool filter) {");
append_line(fs_buf, &fs_len, "return texture2D(tex, uv);");
append_line(fs_buf, &fs_len, "}");
}
}
if (opt_alpha && opt_noise) {
append_line(fs_buf, &fs_len, "uniform int frame_count;");
append_line(fs_buf, &fs_len, "uniform int window_height;");
append_line(fs_buf, &fs_len, "float random(in vec3 value) {");
append_line(fs_buf, &fs_len, " float random = dot(sin(value), vec3(12.9898, 78.233, 37.719));");
append_line(fs_buf, &fs_len, " return fract(sin(random) * 143758.5453);");
append_line(fs_buf, &fs_len, "}");
}
append_line(fs_buf, &fs_len, "void main() {");
if (used_textures[0]) {
append_line(fs_buf, &fs_len, "vec4 texVal0 = sampleTex(uTex0, vTexCoord, uTex0Size, uTex0Filter);");
}
if (used_textures[1]) {
append_line(fs_buf, &fs_len, "vec4 texVal1 = sampleTex(uTex1, vTexCoord, uTex1Size, uTex1Filter);");
}
append_str(fs_buf, &fs_len, opt_alpha ? "vec4 texel = " : "vec3 texel = ");
if (!color_alpha_same && opt_alpha) {
append_str(fs_buf, &fs_len, "vec4(");
append_formula(fs_buf, &fs_len, c, do_single[0], do_multiply[0], do_mix[0], false, false, true);
append_str(fs_buf, &fs_len, ", ");
append_formula(fs_buf, &fs_len, c, do_single[1], do_multiply[1], do_mix[1], true, true, true);
append_str(fs_buf, &fs_len, ")");
} else {
append_formula(fs_buf, &fs_len, c, do_single[0], do_multiply[0], do_mix[0], opt_alpha, false, opt_alpha);
}
append_line(fs_buf, &fs_len, ";");
if (opt_texture_edge && opt_alpha) {
append_line(fs_buf, &fs_len, "if (texel.a > 0.3) texel.a = 1.0; else discard;");
}
// TODO discard if alpha is 0?
if (opt_fog) {
if (opt_alpha) {
append_line(fs_buf, &fs_len, "texel = vec4(mix(texel.rgb, vFog.rgb, vFog.a), texel.a);");
} else {
append_line(fs_buf, &fs_len, "texel = mix(texel, vFog.rgb, vFog.a);");
}
}
if (opt_alpha && opt_noise) {
append_line(fs_buf, &fs_len, "texel.a *= floor(random(vec3(floor(gl_FragCoord.xy * float(window_height)), float(frame_count))) + 0.5);");
}
if (opt_alpha) {
append_line(fs_buf, &fs_len, "gl_FragColor = texel;");
} else {
append_line(fs_buf, &fs_len, "gl_FragColor = vec4(texel, 1.0);");
}
append_line(fs_buf, &fs_len, "}");
vs_buf[vs_len] = '\0';
fs_buf[fs_len] = '\0';
/*puts("Vertex shader:");
puts(vs_buf);
puts("Fragment shader:");
puts(fs_buf);
puts("End");*/
const GLchar *sources[2] = { vs_buf, fs_buf };
const GLint lengths[2] = { vs_len, fs_len };
GLint success;
GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &sources[0], &lengths[0]);
glCompileShader(vertex_shader);
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
if (!success) {
GLint max_length = 0;
glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &max_length);
char error_log[1024];
fprintf(stderr, "Vertex shader compilation failed\n");
glGetShaderInfoLog(vertex_shader, max_length, &max_length, &error_log[0]);
fprintf(stderr, "%s\n", &error_log[0]);
sys_fatal("vertex shader compilation failed (see terminal)");
}
GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &sources[1], &lengths[1]);
glCompileShader(fragment_shader);
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
if (!success) {
GLint max_length = 0;
glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &max_length);
char error_log[1024];
fprintf(stderr, "Fragment shader compilation failed\n");
glGetShaderInfoLog(fragment_shader, max_length, &max_length, &error_log[0]);
fprintf(stderr, "%s\n", &error_log[0]);
sys_fatal("fragment shader compilation failed (see terminal)");
}
GLuint shader_program = glCreateProgram();
glAttachShader(shader_program, vertex_shader);
glAttachShader(shader_program, fragment_shader);
glLinkProgram(shader_program);
size_t cnt = 0;
struct ShaderProgram *prg = &shader_program_pool[shader_program_pool_size++];
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aVtxPos");
prg->attrib_sizes[cnt] = 4;
++cnt;
if (used_textures[0] || used_textures[1]) {
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aTexCoord");
prg->attrib_sizes[cnt] = 2;
++cnt;
}
if (opt_fog) {
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aFog");
prg->attrib_sizes[cnt] = 4;
++cnt;
}
for (int i = 0; i < num_inputs; i++) {
char name[16];
sprintf(name, "aInput%d", i + 1);
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, name);
prg->attrib_sizes[cnt] = opt_alpha ? 4 : 3;
++cnt;
}
prg->shader_id = shader_id;
prg->opengl_program_id = shader_program;
prg->num_inputs = num_inputs;
prg->used_textures[0] = used_textures[0];
prg->used_textures[1] = used_textures[1];
prg->num_floats = num_floats;
prg->num_attribs = cnt;
gfx_opengl_load_shader(prg);
if (used_textures[0]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTex0");
prg->uniform_locations[0] = glGetUniformLocation(shader_program, "uTex0Size");
prg->uniform_locations[1] = glGetUniformLocation(shader_program, "uTex0Filter");
glUniform1i(sampler_location, 0);
}
if (used_textures[1]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTex1");
prg->uniform_locations[2] = glGetUniformLocation(shader_program, "uTex1Size");
prg->uniform_locations[3] = glGetUniformLocation(shader_program, "uTex1Filter");
glUniform1i(sampler_location, 1);
}
if (opt_alpha && opt_noise) {
prg->uniform_locations[4] = glGetUniformLocation(shader_program, "frame_count");
prg->uniform_locations[5] = glGetUniformLocation(shader_program, "window_height");
prg->used_noise = true;
} else {
prg->used_noise = false;
}
return prg;
}
static struct ShaderProgram *gfx_opengl_lookup_shader(uint32_t shader_id) {
for (size_t i = 0; i < shader_program_pool_size; i++) {
if (shader_program_pool[i].shader_id == shader_id) {
return &shader_program_pool[i];
}
}
return NULL;
}
static void gfx_opengl_shader_get_info(struct ShaderProgram *prg, uint8_t *num_inputs, bool used_textures[2]) {
*num_inputs = prg->num_inputs;
used_textures[0] = prg->used_textures[0];
used_textures[1] = prg->used_textures[1];
}
static GLuint gfx_opengl_new_texture(void) {
if (num_textures >= tex_cache_size) {
tex_cache_size += TEX_CACHE_STEP;
tex_cache = realloc(tex_cache, sizeof(struct GLTexture) * tex_cache_size);
if (!tex_cache) sys_fatal("out of memory allocating texture cache");
// invalidate these because they might be pointing to garbage now
opengl_tex[0] = NULL;
opengl_tex[1] = NULL;
}
glGenTextures(1, &tex_cache[num_textures].gltex);
return num_textures++;
}
static void gfx_opengl_select_texture(int tile, GLuint texture_id) {
opengl_tex[tile] = tex_cache + texture_id;
opengl_curtex = tile;
glActiveTexture(GL_TEXTURE0 + tile);
glBindTexture(GL_TEXTURE_2D, opengl_tex[tile]->gltex);
gfx_opengl_set_texture_uniforms(opengl_prg, tile);
}
static void gfx_opengl_upload_texture(uint8_t *rgba32_buf, int width, int height) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba32_buf);
opengl_tex[opengl_curtex]->size[0] = width;
opengl_tex[opengl_curtex]->size[1] = height;
}
static uint32_t gfx_cm_to_opengl(uint32_t val) {
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) {
const GLenum filter = linear_filter ? GL_LINEAR : GL_NEAREST;
glActiveTexture(GL_TEXTURE0 + tile);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
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));
opengl_curtex = tile;
if (opengl_tex[tile]) {
opengl_tex[tile]->filter = linear_filter;
gfx_opengl_set_texture_uniforms(opengl_prg, tile);
}
}
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);
current_height = 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 inline bool gl_get_version(int *major, int *minor, bool *is_es) {
const char *vstr = (const char *)glGetString(GL_VERSION);
if (!vstr || !vstr[0]) return false;
if (!strncmp(vstr, "OpenGL ES ", 10)) {
vstr += 10;
*is_es = true;
} else if (!strncmp(vstr, "OpenGL ES-CM ", 13)) {
vstr += 13;
*is_es = true;
}
return (sscanf(vstr, "%d.%d", major, minor) == 2);
}
static void gfx_opengl_init(void) {
#if FOR_WINDOWS || defined(OSX_BUILD)
GLenum err;
if ((err = glewInit()) != GLEW_OK)
sys_fatal("could not init GLEW:\n%s", glewGetErrorString(err));
#endif
tex_cache_size = TEX_CACHE_STEP;
tex_cache = calloc(tex_cache_size, sizeof(struct GLTexture));
if (!tex_cache) sys_fatal("out of memory allocating texture cache");
// check GL version
int vmajor, vminor;
bool is_es = false;
gl_get_version(&vmajor, &vminor, &is_es);
if (vmajor < 2 && vminor < 1 && !is_es)
sys_fatal("OpenGL 2.1+ is required.\nReported version: %s%d.%d", is_es ? "ES" : "", vmajor, vminor);
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) {
frame_count++;
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);
}
static void gfx_opengl_shutdown(void) {
}
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,
gfx_opengl_shutdown
};
#endif // RAPI_GL
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