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gfx_opengl.cpp
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#include "window/Window.h"
#ifdef ENABLE_OPENGL
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <map>
#include <unordered_map>
#ifndef _LANGUAGE_C
#define _LANGUAGE_C
#endif
#include "libultraship/libultra/gbi.h"
#ifdef __MINGW32__
#define FOR_WINDOWS 1
#else
#define FOR_WINDOWS 0
#endif
#ifdef _MSC_VER
#include <SDL2/SDL.h>
// #define GL_GLEXT_PROTOTYPES 1
#include <GL/glew.h>
#elif FOR_WINDOWS
#include <GL/glew.h>
#include "SDL.h"
#define GL_GLEXT_PROTOTYPES 1
#include "SDL_opengl.h"
#elif __APPLE__
#include <SDL2/SDL.h>
#include <GL/glew.h>
#elif __SWITCH__
#include <SDL2/SDL.h>
#include <glad/glad.h>
#elif USE_OPENGLES
#include <SDL2/SDL.h>
#include <GLES3/gl3.h>
#else
#include <SDL2/SDL.h>
#include <GL/glew.h>
#define GL_GLEXT_PROTOTYPES 1
// #include <SDL2/SDL_opengles2.h>
#endif
#include "gfx_cc.h"
#include "gfx_rendering_api.h"
#include "window/gui/Gui.h"
#include "window/Window.h"
#include "gfx_pc.h"
#include <public/bridge/consolevariablebridge.h>
using namespace std;
struct ShaderProgram {
GLuint opengl_program_id;
uint8_t num_inputs;
bool used_textures[SHADER_MAX_TEXTURES];
uint8_t num_floats;
GLint attrib_locations[16];
uint8_t attrib_sizes[16];
uint8_t num_attribs;
GLint frame_count_location;
GLint noise_scale_location;
};
struct Framebuffer {
uint32_t width, height;
bool has_depth_buffer;
uint32_t msaa_level;
bool invert_y;
GLuint fbo, clrbuf, clrbuf_msaa, rbo;
};
static map<pair<uint64_t, uint32_t>, struct ShaderProgram> shader_program_pool;
static GLuint opengl_vbo;
#if defined(__APPLE__) || defined(USE_OPENGLES)
static GLuint opengl_vao;
#endif
static bool current_depth_mask;
static uint32_t frame_count;
static vector<Framebuffer> framebuffers;
static size_t current_framebuffer;
static float current_noise_scale;
static FilteringMode current_filter_mode = FILTER_THREE_POINT;
GLuint pixel_depth_rb, pixel_depth_fb;
size_t pixel_depth_rb_size;
static int gfx_opengl_get_max_texture_size() {
GLint max_texture_size;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
return max_texture_size;
}
static const char* gfx_opengl_get_name() {
return "OpenGL";
}
static struct GfxClipParameters gfx_opengl_get_clip_parameters(void) {
return { false, framebuffers[current_framebuffer].invert_y };
}
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 void gfx_opengl_set_uniforms(struct ShaderProgram* prg) {
glUniform1i(prg->frame_count_location, frame_count);
glUniform1f(prg->noise_scale_location, current_noise_scale);
}
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]);
}
}
}
static void gfx_opengl_load_shader(struct ShaderProgram* new_prg) {
// if (!new_prg) return;
glUseProgram(new_prg->opengl_program_id);
gfx_opengl_vertex_array_set_attribs(new_prg);
gfx_opengl_set_uniforms(new_prg);
}
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';
}
#define RAND_NOISE "((random(vec3(floor(gl_FragCoord.xy * noise_scale), float(frame_count))) + 1.0) / 2.0)"
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_1:
return with_alpha ? "vec4(1.0, 1.0, 1.0, 1.0)" : "vec3(1.0, 1.0, 1.0)";
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(texVal0.a, texVal0.a, texVal0.a, texVal0.a)"
: "vec3(texVal0.a, texVal0.a, texVal0.a)");
case SHADER_TEXEL1A:
return hint_single_element ? "texVal1.a"
: (with_alpha ? "vec4(texVal1.a, texVal1.a, texVal1.a, texVal1.a)"
: "vec3(texVal1.a, texVal1.a, texVal1.a)");
case SHADER_TEXEL1:
return with_alpha ? "texVal1" : "texVal1.rgb";
case SHADER_COMBINED:
return with_alpha ? "texel" : "texel.rgb";
case SHADER_NOISE:
return with_alpha ? "vec4(" RAND_NOISE ", " RAND_NOISE ", " RAND_NOISE ", " RAND_NOISE ")"
: "vec3(" RAND_NOISE ", " RAND_NOISE ", " RAND_NOISE ")";
}
} else {
switch (item) {
case SHADER_0:
return "0.0";
case SHADER_1:
return "1.0";
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_TEXEL1A:
return "texVal1.a";
case SHADER_TEXEL1:
return "texVal1.a";
case SHADER_COMBINED:
return "texel.a";
case SHADER_NOISE:
return RAND_NOISE;
}
}
return "";
}
#undef RAND_NOISE
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(uint64_t shader_id0, uint32_t shader_id1) {
struct CCFeatures cc_features;
gfx_cc_get_features(shader_id0, shader_id1, &cc_features);
char vs_buf[1024];
char fs_buf[6000];
size_t vs_len = 0;
size_t fs_len = 0;
size_t num_floats = 4;
// Vertex shader
#if defined(__APPLE__)
append_line(vs_buf, &vs_len, "#version 410 core");
append_line(vs_buf, &vs_len, "in vec4 aVtxPos;");
#elif defined(USE_OPENGLES)
append_line(vs_buf, &vs_len, "#version 300 es");
append_line(vs_buf, &vs_len, "in vec4 aVtxPos;");
#else
append_line(vs_buf, &vs_len, "#version 110");
append_line(vs_buf, &vs_len, "attribute vec4 aVtxPos;");
#endif
for (int i = 0; i < 2; i++) {
if (cc_features.used_textures[i]) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
vs_len += sprintf(vs_buf + vs_len, "in vec2 aTexCoord%d;\n", i);
vs_len += sprintf(vs_buf + vs_len, "out vec2 vTexCoord%d;\n", i);
#else
vs_len += sprintf(vs_buf + vs_len, "attribute vec2 aTexCoord%d;\n", i);
vs_len += sprintf(vs_buf + vs_len, "varying vec2 vTexCoord%d;\n", i);
#endif
num_floats += 2;
for (int j = 0; j < 2; j++) {
if (cc_features.clamp[i][j]) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
vs_len += sprintf(vs_buf + vs_len, "in float aTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
vs_len += sprintf(vs_buf + vs_len, "out float vTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
#else
vs_len += sprintf(vs_buf + vs_len, "attribute float aTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
vs_len += sprintf(vs_buf + vs_len, "varying float vTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
#endif
num_floats += 1;
}
}
}
}
if (cc_features.opt_fog) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(vs_buf, &vs_len, "in vec4 aFog;");
append_line(vs_buf, &vs_len, "out vec4 vFog;");
#else
append_line(vs_buf, &vs_len, "attribute vec4 aFog;");
append_line(vs_buf, &vs_len, "varying vec4 vFog;");
#endif
num_floats += 4;
}
if (cc_features.opt_grayscale) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(vs_buf, &vs_len, "in vec4 aGrayscaleColor;");
append_line(vs_buf, &vs_len, "out vec4 vGrayscaleColor;");
#else
append_line(vs_buf, &vs_len, "attribute vec4 aGrayscaleColor;");
append_line(vs_buf, &vs_len, "varying vec4 vGrayscaleColor;");
#endif
num_floats += 4;
}
for (int i = 0; i < cc_features.num_inputs; i++) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
vs_len += sprintf(vs_buf + vs_len, "in vec%d aInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
vs_len += sprintf(vs_buf + vs_len, "out vec%d vInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
#else
vs_len += sprintf(vs_buf + vs_len, "attribute vec%d aInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
vs_len += sprintf(vs_buf + vs_len, "varying vec%d vInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
#endif
num_floats += cc_features.opt_alpha ? 4 : 3;
}
append_line(vs_buf, &vs_len, "void main() {");
for (int i = 0; i < 2; i++) {
if (cc_features.used_textures[i]) {
vs_len += sprintf(vs_buf + vs_len, "vTexCoord%d = aTexCoord%d;\n", i, i);
for (int j = 0; j < 2; j++) {
if (cc_features.clamp[i][j]) {
vs_len += sprintf(vs_buf + vs_len, "vTexClamp%s%d = aTexClamp%s%d;\n", j == 0 ? "S" : "T", i,
j == 0 ? "S" : "T", i);
}
}
}
}
if (cc_features.opt_fog) {
append_line(vs_buf, &vs_len, "vFog = aFog;");
}
if (cc_features.opt_grayscale) {
append_line(vs_buf, &vs_len, "vGrayscaleColor = aGrayscaleColor;");
}
for (int i = 0; i < cc_features.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
#if defined(__APPLE__)
append_line(fs_buf, &fs_len, "#version 410 core");
#elif defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "#version 300 es");
append_line(fs_buf, &fs_len, "precision mediump float;");
#else
append_line(fs_buf, &fs_len, "#version 130");
#endif
for (int i = 0; i < 2; i++) {
if (cc_features.used_textures[i]) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
fs_len += sprintf(fs_buf + fs_len, "in vec2 vTexCoord%d;\n", i);
#else
fs_len += sprintf(fs_buf + fs_len, "varying vec2 vTexCoord%d;\n", i);
#endif
for (int j = 0; j < 2; j++) {
if (cc_features.clamp[i][j]) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
fs_len += sprintf(fs_buf + fs_len, "in float vTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
#else
fs_len += sprintf(fs_buf + fs_len, "varying float vTexClamp%s%d;\n", j == 0 ? "S" : "T", i);
#endif
}
}
}
}
if (cc_features.opt_fog) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "in vec4 vFog;");
#else
append_line(fs_buf, &fs_len, "varying vec4 vFog;");
#endif
}
if (cc_features.opt_grayscale) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "in vec4 vGrayscaleColor;");
#else
append_line(fs_buf, &fs_len, "varying vec4 vGrayscaleColor;");
#endif
}
for (int i = 0; i < cc_features.num_inputs; i++) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
fs_len += sprintf(fs_buf + fs_len, "in vec%d vInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
#else
fs_len += sprintf(fs_buf + fs_len, "varying vec%d vInput%d;\n", cc_features.opt_alpha ? 4 : 3, i + 1);
#endif
}
if (cc_features.used_textures[0]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTex0;");
}
if (cc_features.used_textures[1]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTex1;");
}
if (cc_features.used_masks[0]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTexMask0;");
}
if (cc_features.used_masks[1]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTexMask1;");
}
if (cc_features.used_blend[0]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTexBlend0;");
}
if (cc_features.used_blend[1]) {
append_line(fs_buf, &fs_len, "uniform sampler2D uTexBlend1;");
}
append_line(fs_buf, &fs_len, "uniform int frame_count;");
append_line(fs_buf, &fs_len, "uniform float noise_scale;");
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, "}");
if (current_filter_mode == FILTER_THREE_POINT) {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "#define TEX_OFFSET(off) texture(tex, texCoord - (off)/texSize)");
#else
append_line(fs_buf, &fs_len, "#define TEX_OFFSET(off) texture2D(tex, texCoord - (off)/texSize)");
#endif
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 hookTexture2D(in sampler2D tex, in vec2 uv, in vec2 texSize) {");
append_line(fs_buf, &fs_len, " return filter3point(tex, uv, texSize);");
append_line(fs_buf, &fs_len, "}");
} else {
append_line(fs_buf, &fs_len, "vec4 hookTexture2D(in sampler2D tex, in vec2 uv, in vec2 texSize) {");
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, " return texture(tex, uv);");
#else
append_line(fs_buf, &fs_len, " return texture2D(tex, uv);");
#endif
append_line(fs_buf, &fs_len, "}");
}
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "out vec4 outColor;");
#endif
append_line(fs_buf, &fs_len, "void main() {");
// Reference approach to color wrapping as per GLideN64
// Return wrapped value of x in interval [low, high)
append_line(fs_buf, &fs_len, "#define WRAP(x, low, high) mod((x)-(low), (high)-(low)) + (low)");
for (int i = 0; i < 2; i++) {
if (cc_features.used_textures[i]) {
bool s = cc_features.clamp[i][0], t = cc_features.clamp[i][1];
#if defined(USE_OPENGLES)
fs_len += sprintf(fs_buf + fs_len, "vec2 texSize%d = vec2(textureSize(uTex%d, 0));\n", i, i);
#else
fs_len += sprintf(fs_buf + fs_len, "vec2 texSize%d = textureSize(uTex%d, 0);\n", i, i);
#endif
if (!s && !t) {
fs_len += sprintf(fs_buf + fs_len, "vec2 vTexCoordAdj%d = vTexCoord%d;\n", i, i);
} else {
if (s && t) {
fs_len += sprintf(fs_buf + fs_len,
"vec2 vTexCoordAdj%d = clamp(vTexCoord%d, 0.5 / texSize%d, "
"vec2(vTexClampS%d, vTexClampT%d));\n",
i, i, i, i, i);
} else if (s) {
fs_len += sprintf(fs_buf + fs_len,
"vec2 vTexCoordAdj%d = vec2(clamp(vTexCoord%d.s, 0.5 / "
"texSize%d.s, vTexClampS%d), vTexCoord%d.t);\n",
i, i, i, i, i);
} else {
fs_len += sprintf(fs_buf + fs_len,
"vec2 vTexCoordAdj%d = vec2(vTexCoord%d.s, clamp(vTexCoord%d.t, "
"0.5 / texSize%d.t, vTexClampT%d));\n",
i, i, i, i, i);
}
}
fs_len += sprintf(fs_buf + fs_len, "vec4 texVal%d = hookTexture2D(uTex%d, vTexCoordAdj%d, texSize%d);\n", i,
i, i, i);
if (cc_features.used_masks[i]) {
#ifdef USE_OPENGLES
fs_len += sprintf(fs_buf + fs_len, "vec2 maskSize%d = vec2(textureSize(uTexMask%d, 0));\n", i, i);
#else
fs_len += sprintf(fs_buf + fs_len, "vec2 maskSize%d = textureSize(uTexMask%d, 0);\n", i, i);
#endif
fs_len +=
sprintf(fs_buf + fs_len,
"vec4 maskVal%d = hookTexture2D(uTexMask%d, vTexCoordAdj%d, maskSize%d);\n", i, i, i, i);
if (cc_features.used_blend[i]) {
fs_len += sprintf(fs_buf + fs_len,
"vec4 blendVal%d = hookTexture2D(uTexBlend%d, vTexCoordAdj%d, texSize%d);\n", i,
i, i, i);
} else {
fs_len += sprintf(fs_buf + fs_len, "vec4 blendVal%d = vec4(0, 0, 0, 0);\n", i);
}
fs_len += sprintf(fs_buf + fs_len, "texVal%d = mix(texVal%d, blendVal%d, maskVal%d.a);\n", i, i, i, i);
}
}
}
append_line(fs_buf, &fs_len, cc_features.opt_alpha ? "vec4 texel;" : "vec3 texel;");
for (int c = 0; c < (cc_features.opt_2cyc ? 2 : 1); c++) {
append_str(fs_buf, &fs_len, "texel = ");
if (!cc_features.color_alpha_same[c] && cc_features.opt_alpha) {
append_str(fs_buf, &fs_len, "vec4(");
append_formula(fs_buf, &fs_len, cc_features.c[c], cc_features.do_single[c][0],
cc_features.do_multiply[c][0], cc_features.do_mix[c][0], false, false, true);
append_str(fs_buf, &fs_len, ", ");
append_formula(fs_buf, &fs_len, cc_features.c[c], cc_features.do_single[c][1],
cc_features.do_multiply[c][1], cc_features.do_mix[c][1], true, true, true);
append_str(fs_buf, &fs_len, ")");
} else {
append_formula(fs_buf, &fs_len, cc_features.c[c], cc_features.do_single[c][0],
cc_features.do_multiply[c][0], cc_features.do_mix[c][0], cc_features.opt_alpha, false,
cc_features.opt_alpha);
}
append_line(fs_buf, &fs_len, ";");
if (c == 0) {
append_str(fs_buf, &fs_len, "texel.rgb = WRAP(texel.rgb, -1.01, 1.01);");
}
}
append_str(fs_buf, &fs_len, "texel.rgb = WRAP(texel.rgb, -0.51, 1.51);");
append_str(fs_buf, &fs_len, "texel.rgb = clamp(texel.rgb, 0.0, 1.0);");
// TODO discard if alpha is 0?
if (cc_features.opt_fog) {
if (cc_features.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 (cc_features.opt_texture_edge && cc_features.opt_alpha) {
append_line(fs_buf, &fs_len, "if (texel.a > 0.19) texel.a = 1.0; else discard;");
}
if (cc_features.opt_alpha && cc_features.opt_noise) {
append_line(fs_buf, &fs_len,
"texel.a *= floor(clamp(random(vec3(floor(gl_FragCoord.xy * noise_scale), float(frame_count))) + "
"texel.a, 0.0, 1.0));");
}
if (cc_features.opt_grayscale) {
append_line(fs_buf, &fs_len, "float intensity = (texel.r + texel.g + texel.b) / 3.0;");
append_line(fs_buf, &fs_len, "vec3 new_texel = vGrayscaleColor.rgb * intensity;");
append_line(fs_buf, &fs_len, "texel.rgb = mix(texel.rgb, new_texel, vGrayscaleColor.a);");
}
if (cc_features.opt_alpha) {
if (cc_features.opt_alpha_threshold) {
append_line(fs_buf, &fs_len, "if (texel.a < 8.0 / 256.0) discard;");
}
if (cc_features.opt_invisible) {
append_line(fs_buf, &fs_len, "texel.a = 0.0;");
}
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "outColor = texel;");
#else
append_line(fs_buf, &fs_len, "gl_FragColor = texel;");
#endif
} else {
#if defined(__APPLE__) || defined(USE_OPENGLES)
append_line(fs_buf, &fs_len, "outColor = vec4(texel, 1.0);");
#else
append_line(fs_buf, &fs_len, "gl_FragColor = vec4(texel, 1.0);");
#endif
}
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] = { (GLint)vs_len, (GLint)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]);
abort();
}
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]);
abort();
}
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[make_pair(shader_id0, shader_id1)];
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aVtxPos");
prg->attrib_sizes[cnt] = 4;
++cnt;
for (int i = 0; i < 2; i++) {
if (cc_features.used_textures[i]) {
char name[32];
sprintf(name, "aTexCoord%d", i);
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, name);
prg->attrib_sizes[cnt] = 2;
++cnt;
for (int j = 0; j < 2; j++) {
if (cc_features.clamp[i][j]) {
sprintf(name, "aTexClamp%s%d", j == 0 ? "S" : "T", i);
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, name);
prg->attrib_sizes[cnt] = 1;
++cnt;
}
}
}
}
if (cc_features.opt_fog) {
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aFog");
prg->attrib_sizes[cnt] = 4;
++cnt;
}
if (cc_features.opt_grayscale) {
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, "aGrayscaleColor");
prg->attrib_sizes[cnt] = 4;
++cnt;
}
for (int i = 0; i < cc_features.num_inputs; i++) {
char name[16];
sprintf(name, "aInput%d", i + 1);
prg->attrib_locations[cnt] = glGetAttribLocation(shader_program, name);
prg->attrib_sizes[cnt] = cc_features.opt_alpha ? 4 : 3;
++cnt;
}
prg->opengl_program_id = shader_program;
prg->num_inputs = cc_features.num_inputs;
prg->used_textures[0] = cc_features.used_textures[0];
prg->used_textures[1] = cc_features.used_textures[1];
prg->used_textures[2] = cc_features.used_masks[0];
prg->used_textures[3] = cc_features.used_masks[1];
prg->used_textures[4] = cc_features.used_blend[0];
prg->used_textures[5] = cc_features.used_blend[1];
prg->num_floats = num_floats;
prg->num_attribs = cnt;
prg->frame_count_location = glGetUniformLocation(shader_program, "frame_count");
prg->noise_scale_location = glGetUniformLocation(shader_program, "noise_scale");
gfx_opengl_load_shader(prg);
if (cc_features.used_textures[0]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTex0");
glUniform1i(sampler_location, 0);
}
if (cc_features.used_textures[1]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTex1");
glUniform1i(sampler_location, 1);
}
if (cc_features.used_masks[0]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTexMask0");
glUniform1i(sampler_location, 2);
}
if (cc_features.used_masks[1]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTexMask1");
glUniform1i(sampler_location, 3);
}
if (cc_features.used_blend[0]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTexBlend0");
glUniform1i(sampler_location, 4);
}
if (cc_features.used_blend[1]) {
GLint sampler_location = glGetUniformLocation(shader_program, "uTexBlend1");
glUniform1i(sampler_location, 5);
}
return prg;
}
static struct ShaderProgram* gfx_opengl_lookup_shader(uint64_t shader_id0, uint32_t shader_id1) {
auto it = shader_program_pool.find(make_pair(shader_id0, shader_id1));
return it == shader_program_pool.end() ? nullptr : &it->second;
}
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) {
GLuint ret;
glGenTextures(1, &ret);
return ret;
}
static void gfx_opengl_delete_texture(uint32_t texID) {
glDeleteTextures(1, &texID);
}
static void gfx_opengl_select_texture(int tile, GLuint texture_id) {
glActiveTexture(GL_TEXTURE0 + tile);
glBindTexture(GL_TEXTURE_2D, texture_id);
}
static void gfx_opengl_upload_texture(const uint8_t* rgba32_buf, uint32_t width, uint32_t height) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba32_buf);
}
#if defined(__SWITCH__) || defined(USE_OPENGLES)
#define GL_MIRROR_CLAMP_TO_EDGE 0x8743
#endif
static uint32_t gfx_cm_to_opengl(uint32_t val) {
switch (val) {
case G_TX_NOMIRROR | G_TX_CLAMP:
return GL_CLAMP_TO_EDGE;
case G_TX_MIRROR | G_TX_WRAP:
return GL_MIRRORED_REPEAT;
case G_TX_MIRROR | G_TX_CLAMP:
return GL_MIRROR_CLAMP_TO_EDGE;
case G_TX_NOMIRROR | G_TX_WRAP:
return GL_REPEAT;
}
return 0;
}
static void gfx_opengl_set_sampler_parameters(int tile, bool linear_filter, uint32_t cms, uint32_t cmt) {
const GLint filter = linear_filter && current_filter_mode == FILTER_LINEAR ? 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));
}
static void gfx_opengl_set_depth_test_and_mask(bool depth_test, bool z_upd) {
if (depth_test || z_upd) {
glEnable(GL_DEPTH_TEST);
glDepthMask(z_upd ? GL_TRUE : GL_FALSE);
glDepthFunc(depth_test ? GL_LEQUAL : GL_ALWAYS);
current_depth_mask = z_upd;
} else {
glDisable(GL_DEPTH_TEST);
}
}
static void gfx_opengl_set_zmode_decal(bool zmode_decal) {
if (zmode_decal) {
// SSDB = SlopeScaledDepthBias 120 leads to -2 at 240p which is the same as N64 mode which has very little
// fighting
const int n64modeFactor = 120;
const int noVanishFactor = 100;
GLfloat SSDB = -2;
switch (CVarGetInteger("gZFightingMode", 0)) {
// scaled z-fighting (N64 mode like)
case 1:
if (framebuffers.size() > current_framebuffer) { // safety check for vector size can probably be removed
SSDB = -1.0f * (GLfloat)framebuffers[current_framebuffer].height / n64modeFactor;
}
break;
// no vanishing paths
case 2:
if (framebuffers.size() > current_framebuffer) { // safety check for vector size can probably be removed
SSDB = -1.0f * (GLfloat)framebuffers[current_framebuffer].height / noVanishFactor;
}
break;
// disabled
case 0:
default:
SSDB = -2;
}
glPolygonOffset(SSDB, -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 !defined(__SWITCH__) && !defined(USE_OPENGLES)
glewInit();
#endif
glGenBuffers(1, &opengl_vbo);
glBindBuffer(GL_ARRAY_BUFFER, opengl_vbo);
#if defined(__APPLE__) || defined(USE_OPENGLES)
glGenVertexArrays(1, &opengl_vao);
glBindVertexArray(opengl_vao);
#endif
#ifndef USE_OPENGLES // not supported on gles
glEnable(GL_DEPTH_CLAMP);
#endif
glDepthFunc(GL_LEQUAL);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
framebuffers.resize(1); // for the default screen buffer
glGenRenderbuffers(1, &pixel_depth_rb);
glBindRenderbuffer(GL_RENDERBUFFER, pixel_depth_rb);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 1, 1);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glGenFramebuffers(1, &pixel_depth_fb);
glBindFramebuffer(GL_FRAMEBUFFER, pixel_depth_fb);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, pixel_depth_rb);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
pixel_depth_rb_size = 1;
}
static void gfx_opengl_on_resize(void) {
}
static void gfx_opengl_start_frame(void) {
frame_count++;
}
static void gfx_opengl_end_frame(void) {
glFlush();
}
static void gfx_opengl_finish_render(void) {
}
static int gfx_opengl_create_framebuffer() {
GLuint clrbuf;
glGenTextures(1, &clrbuf);
glBindTexture(GL_TEXTURE_2D, clrbuf);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
GLuint clrbuf_msaa;
glGenRenderbuffers(1, &clrbuf_msaa);
GLuint rbo;
glGenRenderbuffers(1, &rbo);
glBindRenderbuffer(GL_RENDERBUFFER, rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 1, 1);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
GLuint fbo;
glGenFramebuffers(1, &fbo);
size_t i = framebuffers.size();
framebuffers.resize(i + 1);
framebuffers[i].fbo = fbo;
framebuffers[i].clrbuf = clrbuf;
framebuffers[i].clrbuf_msaa = clrbuf_msaa;
framebuffers[i].rbo = rbo;
return i;
}
static void gfx_opengl_update_framebuffer_parameters(int fb_id, uint32_t width, uint32_t height, uint32_t msaa_level,
bool opengl_invert_y, bool render_target, bool has_depth_buffer,
bool can_extract_depth) {
Framebuffer& fb = framebuffers[fb_id];
width = max(width, 1U);
height = max(height, 1U);
glBindFramebuffer(GL_FRAMEBUFFER, fb.fbo);
if (fb_id != 0) {
if (fb.width != width || fb.height != height || fb.msaa_level != msaa_level) {
if (msaa_level <= 1) {
glBindTexture(GL_TEXTURE_2D, fb.clrbuf);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb.clrbuf, 0);
} else {
glBindRenderbuffer(GL_RENDERBUFFER, fb.clrbuf_msaa);
glRenderbufferStorageMultisample(GL_RENDERBUFFER, msaa_level, GL_RGB8, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, fb.clrbuf_msaa);
}
}
if (has_depth_buffer &&
(fb.width != width || fb.height != height || fb.msaa_level != msaa_level || !fb.has_depth_buffer)) {
glBindRenderbuffer(GL_RENDERBUFFER, fb.rbo);
if (msaa_level <= 1) {
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
} else {
glRenderbufferStorageMultisample(GL_RENDERBUFFER, msaa_level, GL_DEPTH24_STENCIL8, width, height);
}
glBindRenderbuffer(GL_RENDERBUFFER, 0);
}
if (!fb.has_depth_buffer && has_depth_buffer) {
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb.rbo);
} else if (fb.has_depth_buffer && !has_depth_buffer) {
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0);
}
}
fb.width = width;
fb.height = height;
fb.has_depth_buffer = has_depth_buffer;
fb.msaa_level = msaa_level;
fb.invert_y = opengl_invert_y;
}
void gfx_opengl_start_draw_to_framebuffer(int fb_id, float noise_scale) {
Framebuffer& fb = framebuffers[fb_id];
if (noise_scale != 0.0f) {
current_noise_scale = 1.0f / noise_scale;
}
glBindFramebuffer(GL_FRAMEBUFFER, fb.fbo);
current_framebuffer = fb_id;
}
void gfx_opengl_clear_framebuffer() {
glDisable(GL_SCISSOR_TEST);
glDepthMask(GL_TRUE);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDepthMask(current_depth_mask ? GL_TRUE : GL_FALSE);
glEnable(GL_SCISSOR_TEST);
}
void gfx_opengl_resolve_msaa_color_buffer(int fb_id_target, int fb_id_source) {
Framebuffer& fb_dst = framebuffers[fb_id_target];
Framebuffer& fb_src = framebuffers[fb_id_source];