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RetroArch/gfx/shader_glsl.c
Themaister 551fd27204 Add support for wrapping modes. 
Not terribly useful atm due to POT, but at least it's there.
Has some use mostly with LUTs ... NPOT + REPEAT requires extension on
GLES2 at least.
2013-08-16 00:30:54 +02:00

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "../boolean.h"
#include <string.h>
#include "../general.h"
#include "shader_glsl.h"
#include "../compat/strl.h"
#include "../compat/posix_string.h"
#include "state_tracker.h"
#include "../dynamic.h"
#include "../file.h"
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#if defined(IOS)
#include <OpenGLES/ES2/gl.h>
#include <OpenGLES/ES2/glext.h>
#elif defined(__APPLE__) // Because they like to be "oh, so, special".
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
#elif defined(HAVE_PSGL)
#include <PSGL/psgl.h>
#include <PSGL/psglu.h>
#include <GLES/glext.h>
#elif defined(HAVE_OPENGL_MODERN)
#include <EGL/egl.h>
#include <GL3/gl3.h>
#include <GL3/gl3ext.h>
#elif defined(HAVE_OPENGLES2)
#include <GLES2/gl2.h>
#elif defined(HAVE_OPENGLES1)
#include <GLES/gl.h>
#include <GLES/glext.h>
#else
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glext.h>
#endif
#include "gfx_context.h"
#include <stdlib.h>
#include "gl_common.h"
#include "image.h"
#ifdef HAVE_OPENGLES2
#define BORDER_FUNC GL_CLAMP_TO_EDGE
#else
#define BORDER_FUNC GL_CLAMP_TO_BORDER
#endif
#define PREV_TEXTURES (MAX_TEXTURES - 1)
static struct gfx_shader *glsl_shader;
static bool glsl_core;
static unsigned glsl_major;
static unsigned glsl_minor;
static bool glsl_enable;
static GLuint gl_program[GFX_MAX_SHADERS];
static unsigned active_index;
static GLuint gl_teximage[GFX_MAX_TEXTURES];
static state_tracker_t *gl_state_tracker;
static GLint gl_attribs[PREV_TEXTURES + 1 + 4 + GFX_MAX_SHADERS];
static unsigned gl_attrib_index;
// Cache the VBO.
struct cache_vbo
{
GLuint vbo_primary;
GLfloat buffer_primary[128];
size_t size_primary;
GLuint vbo_secondary;
GLfloat buffer_secondary[128];
size_t size_secondary;
};
static struct cache_vbo glsl_vbo[GFX_MAX_SHADERS];
struct glsl_attrib
{
GLint loc;
GLsizei size;
GLsizei offset;
};
static gfx_ctx_proc_t (*glsl_get_proc_address)(const char*);
struct shader_uniforms_frame
{
int texture;
int input_size;
int texture_size;
int tex_coord;
};
struct shader_uniforms
{
int mvp;
int tex_coord;
int vertex_coord;
int color;
int lut_tex_coord;
int input_size;
int output_size;
int texture_size;
int frame_count;
unsigned frame_count_mod;
int frame_direction;
int lut_texture[GFX_MAX_TEXTURES];
struct shader_uniforms_frame orig;
struct shader_uniforms_frame pass[GFX_MAX_SHADERS];
struct shader_uniforms_frame prev[PREV_TEXTURES];
};
static struct shader_uniforms gl_uniforms[GFX_MAX_SHADERS];
static const char *glsl_prefixes[] = {
"",
"ruby",
};
// Need to duplicate these to work around broken stuff on Android.
// Must enforce alpha = 1.0 or 32-bit games can potentially go black.
static const char *stock_vertex_modern =
"attribute vec2 TexCoord;\n"
"attribute vec2 VertexCoord;\n"
"attribute vec4 Color;\n"
"uniform mat4 MVPMatrix;\n"
"varying vec2 tex_coord;\n"
"void main() {\n"
" gl_Position = MVPMatrix * vec4(VertexCoord, 0.0, 1.0);\n"
" tex_coord = TexCoord;\n"
"}";
static const char *stock_fragment_modern =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D Texture;\n"
"varying vec2 tex_coord;\n"
"void main() {\n"
" gl_FragColor = vec4(texture2D(Texture, tex_coord).rgb, 1.0);\n"
"}";
static const char *stock_vertex_core =
"in vec2 TexCoord;\n"
"in vec2 VertexCoord;\n"
"in vec4 Color;\n"
"uniform mat4 MVPMatrix;\n"
"out vec2 tex_coord;\n"
"void main() {\n"
" gl_Position = MVPMatrix * vec4(VertexCoord, 0.0, 1.0);\n"
" tex_coord = TexCoord;\n"
"}";
static const char *stock_fragment_core =
"uniform sampler2D Texture;\n"
"in vec2 tex_coord;\n"
"out vec4 FragColor;\n"
"void main() {\n"
" FragColor = vec4(texture(Texture, tex_coord).rgb, 1.0);\n"
"}";
static const char *stock_vertex_legacy =
"varying vec4 color;\n"
"void main() {\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" gl_TexCoord[0] = gl_MultiTexCoord0;\n"
" color = gl_Color;\n"
"}";
static const char *stock_fragment_legacy =
"uniform sampler2D Texture;\n"
"varying vec4 color;\n"
"void main() {\n"
" gl_FragColor = color * texture2D(Texture, gl_TexCoord[0].xy);\n"
"}";
static const char *stock_vertex_modern_blend =
"attribute vec2 TexCoord;\n"
"attribute vec2 VertexCoord;\n"
"attribute vec4 Color;\n"
"uniform mat4 MVPMatrix;\n"
"varying vec2 tex_coord;\n"
"varying vec4 color;\n"
"void main() {\n"
" gl_Position = MVPMatrix * vec4(VertexCoord, 0.0, 1.0);\n"
" tex_coord = TexCoord;\n"
" color = Color;\n"
"}";
static const char *stock_fragment_modern_blend =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D Texture;\n"
"varying vec2 tex_coord;\n"
"varying vec4 color;\n"
"void main() {\n"
" gl_FragColor = color * texture2D(Texture, tex_coord);\n"
"}";
static const char *stock_vertex_core_blend =
"in vec2 TexCoord;\n"
"in vec2 VertexCoord;\n"
"in vec4 Color;\n"
"uniform mat4 MVPMatrix;\n"
"out vec2 tex_coord;\n"
"out vec4 color;\n"
"void main() {\n"
" gl_Position = MVPMatrix * vec4(VertexCoord, 0.0, 1.0);\n"
" tex_coord = TexCoord;\n"
" color = Color;\n"
"}";
static const char *stock_fragment_core_blend =
"uniform sampler2D Texture;\n"
"in vec2 tex_coord;\n"
"in vec4 color;\n"
"out vec4 FragColor;\n"
"void main() {\n"
" FragColor = color * texture(Texture, tex_coord);\n"
"}";
static GLint get_uniform(GLuint prog, const char *base)
{
char buf[64];
snprintf(buf, sizeof(buf), "%s%s", glsl_shader->prefix, base);
GLint loc = glGetUniformLocation(prog, buf);
if (loc >= 0)
return loc;
for (unsigned i = 0; i < ARRAY_SIZE(glsl_prefixes); i++)
{
snprintf(buf, sizeof(buf), "%s%s", glsl_prefixes[i], base);
GLint loc = glGetUniformLocation(prog, buf);
if (loc >= 0)
return loc;
}
return -1;
}
static GLint get_attrib(GLuint prog, const char *base)
{
char buf[64];
snprintf(buf, sizeof(buf), "%s%s", glsl_shader->prefix, base);
GLint loc = glGetUniformLocation(prog, buf);
if (loc >= 0)
return loc;
for (unsigned i = 0; i < ARRAY_SIZE(glsl_prefixes); i++)
{
snprintf(buf, sizeof(buf), "%s%s", glsl_prefixes[i], base);
GLint loc = glGetAttribLocation(prog, buf);
if (loc >= 0)
return loc;
}
return -1;
}
static bool load_luts(void)
{
if (!glsl_shader->luts)
return true;
glGenTextures(1, gl_teximage);
for (unsigned i = 0; i < glsl_shader->luts; i++)
{
RARCH_LOG("Loading texture image from: \"%s\" ...\n",
glsl_shader->lut[i].path);
struct texture_image img = {0};
if (!texture_image_load(glsl_shader->lut[i].path, &img))
{
RARCH_ERR("Failed to load texture image from: \"%s\"\n", glsl_shader->lut[i].path);
return false;
}
glBindTexture(GL_TEXTURE_2D, gl_teximage[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, BORDER_FUNC);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, BORDER_FUNC);
GLenum filter = glsl_shader->lut[i].filter == RARCH_FILTER_NEAREST ?
GL_NEAREST : GL_LINEAR;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glTexImage2D(GL_TEXTURE_2D,
0, driver.gfx_use_rgba ? GL_RGBA : RARCH_GL_INTERNAL_FORMAT32,
img.width, img.height, 0,
driver.gfx_use_rgba ? GL_RGBA : RARCH_GL_TEXTURE_TYPE32,
RARCH_GL_FORMAT32, img.pixels);
glBindTexture(GL_TEXTURE_2D, 0);
free(img.pixels);
}
return true;
}
static void print_shader_log(GLuint obj)
{
GLint info_len = 0;
GLint max_len;
glGetShaderiv(obj, GL_INFO_LOG_LENGTH, &max_len);
if (max_len == 0)
return;
char *info_log = (char*)malloc(max_len);
if (!info_log)
return;
glGetShaderInfoLog(obj, max_len, &info_len, info_log);
if (info_len > 0)
RARCH_LOG("Shader log: %s\n", info_log);
free(info_log);
}
static void print_linker_log(GLuint obj)
{
GLint info_len = 0;
GLint max_len;
glGetProgramiv(obj, GL_INFO_LOG_LENGTH, &max_len);
if (max_len == 0)
return;
char *info_log = (char*)malloc(max_len);
if (!info_log)
return;
glGetProgramInfoLog(obj, max_len, &info_len, info_log);
if (info_len > 0)
RARCH_LOG("Linker log: %s\n", info_log);
free(info_log);
}
static bool compile_shader(GLuint shader, const char *define, const char *program)
{
char version[32] = {0};
if (glsl_core && !strstr(program, "#version"))
{
unsigned version_no = 0;
unsigned gl_ver = glsl_major * 100 + glsl_minor * 10;
switch (gl_ver)
{
case 300: version_no = 130; break;
case 310: version_no = 140; break;
case 320: version_no = 150; break;
default: version_no = gl_ver; break;
}
snprintf(version, sizeof(version), "#version %u\n", version_no);
RARCH_LOG("[GL]: Using GLSL version %u.\n", version_no);
}
const char *source[] = { version, define, program };
glShaderSource(shader, ARRAY_SIZE(source), source, NULL);
glCompileShader(shader);
GLint status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
print_shader_log(shader);
return status == GL_TRUE;
}
static bool link_program(GLuint prog)
{
glLinkProgram(prog);
GLint status;
glGetProgramiv(prog, GL_LINK_STATUS, &status);
print_linker_log(prog);
if (status == GL_TRUE)
{
glUseProgram(prog);
return true;
}
else
return false;
}
static GLuint compile_program(const char *vertex, const char *fragment, unsigned i)
{
GLuint prog = glCreateProgram();
if (!prog)
return 0;
if (vertex)
{
RARCH_LOG("Found GLSL vertex shader.\n");
GLuint shader = glCreateShader(GL_VERTEX_SHADER);
if (!compile_shader(shader, "#define VERTEX\n", vertex))
{
RARCH_ERR("Failed to compile vertex shader #%u\n", i);
return false;
}
glAttachShader(prog, shader);
}
if (fragment)
{
RARCH_LOG("Found GLSL fragment shader.\n");
GLuint shader = glCreateShader(GL_FRAGMENT_SHADER);
if (!compile_shader(shader, "#define FRAGMENT\n", fragment))
{
RARCH_ERR("Failed to compile fragment shader #%u\n", i);
return false;
}
glAttachShader(prog, shader);
}
if (vertex || fragment)
{
RARCH_LOG("Linking GLSL program.\n");
if (!link_program(prog))
{
RARCH_ERR("Failed to link program #%u.\n", i);
return 0;
}
glUseProgram(prog);
GLint location = get_uniform(prog, "Texture");
glUniform1i(location, 0);
glUseProgram(0);
}
return prog;
}
static bool load_source_path(struct gfx_shader_pass *pass, const char *path)
{
if (read_file(path, (void**)&pass->source.xml.vertex) <= 0)
return false;
pass->source.xml.fragment = strdup(pass->source.xml.vertex);
return pass->source.xml.fragment && pass->source.xml.vertex;
}
static bool compile_programs(GLuint *gl_prog)
{
for (unsigned i = 0; i < glsl_shader->passes; i++)
{
struct gfx_shader_pass *pass = &glsl_shader->pass[i];
// If we load from GLSLP (CGP),
// load the file here, and pretend
// we were really using XML all along.
if (*pass->source.cg && !load_source_path(pass, pass->source.cg))
{
RARCH_ERR("Failed to load GLSL shader: %s.\n", pass->source.cg);
return false;
}
*pass->source.cg = '\0';
const char *vertex = pass->source.xml.vertex;
const char *fragment = pass->source.xml.fragment;
gl_prog[i] = compile_program(vertex, fragment, i);
if (!gl_prog[i])
{
RARCH_ERR("Failed to create GL program #%u.\n", i);
return false;
}
}
return true;
}
static void gl_glsl_reset_attrib(void)
{
for (unsigned i = 0; i < gl_attrib_index; i++)
glDisableVertexAttribArray(gl_attribs[i]);
gl_attrib_index = 0;
}
static void gl_glsl_set_vbo(GLfloat *buffer, size_t *buffer_elems, const GLfloat *data, size_t elems)
{
if (elems != *buffer_elems || memcmp(data, buffer, elems * sizeof(GLfloat)))
{
//RARCH_LOG("[GL]: VBO updated with %u elems.\n", (unsigned)elems);
memcpy(buffer, data, elems * sizeof(GLfloat));
glBufferData(GL_ARRAY_BUFFER, elems * sizeof(GLfloat), data, GL_STATIC_DRAW);
*buffer_elems = elems;
}
}
static void gl_glsl_set_attribs(GLuint vbo, GLfloat *buffer, size_t *buffer_elems,
const GLfloat *data, size_t elems, const struct glsl_attrib *attrs, size_t num_attrs)
{
glBindBuffer(GL_ARRAY_BUFFER, vbo);
gl_glsl_set_vbo(buffer, buffer_elems, data, elems);
for (size_t i = 0; i < num_attrs; i++)
{
GLint loc = attrs[i].loc;
glEnableVertexAttribArray(loc);
gl_attribs[gl_attrib_index++] = loc;
glVertexAttribPointer(loc, attrs[i].size, GL_FLOAT, GL_FALSE, 0,
(const GLvoid*)(uintptr_t)attrs[i].offset);
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
static void clear_uniforms_frame(struct shader_uniforms_frame *frame)
{
frame->texture = -1;
frame->texture_size = -1;
frame->input_size = -1;
frame->tex_coord = -1;
}
static void find_uniforms_frame(GLuint prog, struct shader_uniforms_frame *frame, const char *base)
{
char texture[64];
char texture_size[64];
char input_size[64];
char tex_coord[64];
snprintf(texture, sizeof(texture), "%s%s", base, "Texture");
snprintf(texture_size, sizeof(texture_size), "%s%s", base, "TextureSize");
snprintf(input_size, sizeof(input_size), "%s%s", base, "InputSize");
snprintf(tex_coord, sizeof(tex_coord), "%s%s", base, "TexCoord");
if (frame->texture < 0)
frame->texture = get_uniform(prog, texture);
if (frame->texture_size < 0)
frame->texture_size = get_uniform(prog, texture_size);
if (frame->input_size < 0)
frame->input_size = get_uniform(prog, input_size);
if (frame->tex_coord < 0)
frame->tex_coord = get_attrib(prog, tex_coord);
}
static void find_uniforms(unsigned pass, GLuint prog, struct shader_uniforms *uni)
{
glUseProgram(prog);
uni->mvp = get_uniform(prog, "MVPMatrix");
uni->tex_coord = get_attrib(prog, "TexCoord");
uni->vertex_coord = get_attrib(prog, "VertexCoord");
uni->color = get_attrib(prog, "Color");
uni->lut_tex_coord = get_attrib(prog, "LUTTexCoord");
uni->input_size = get_uniform(prog, "InputSize");
uni->output_size = get_uniform(prog, "OutputSize");
uni->texture_size = get_uniform(prog, "TextureSize");
uni->frame_count = get_uniform(prog, "FrameCount");
uni->frame_direction = get_uniform(prog, "FrameDirection");
for (unsigned i = 0; i < glsl_shader->luts; i++)
uni->lut_texture[i] = glGetUniformLocation(prog, glsl_shader->lut[i].id);
char frame_base[64];
clear_uniforms_frame(&uni->orig);
find_uniforms_frame(prog, &uni->orig, "Orig");
if (pass > 1)
{
snprintf(frame_base, sizeof(frame_base), "PassPrev%u", pass);
find_uniforms_frame(prog, &uni->orig, frame_base);
}
for (unsigned i = 0; i < GFX_MAX_SHADERS; i++)
{
snprintf(frame_base, sizeof(frame_base), "Pass%u", i + 1);
clear_uniforms_frame(&uni->pass[i]);
find_uniforms_frame(prog, &uni->pass[i], frame_base);
if (i && pass > i + 1)
{
snprintf(frame_base, sizeof(frame_base), "PassPrev%u", pass - i);
find_uniforms_frame(prog, &uni->pass[i], frame_base);
}
}
clear_uniforms_frame(&uni->prev[0]);
find_uniforms_frame(prog, &uni->prev[0], "Prev");
for (unsigned i = 1; i < PREV_TEXTURES; i++)
{
snprintf(frame_base, sizeof(frame_base), "Prev%u", i);
clear_uniforms_frame(&uni->prev[i]);
find_uniforms_frame(prog, &uni->prev[i], frame_base);
}
glUseProgram(0);
}
static void gl_glsl_delete_shader(GLuint prog)
{
GLsizei count;
GLuint shaders[2] = {0};
glGetAttachedShaders(prog, 2, &count, shaders);
for (GLsizei i = 0; i < count; i++)
{
glDetachShader(prog, shaders[i]);
glDeleteShader(shaders[i]);
}
glDeleteProgram(prog);
}
static void gl_glsl_free_shader(void)
{
if (!glsl_shader)
return;
for (unsigned i = 0; i < glsl_shader->passes; i++)
{
free(glsl_shader->pass[i].source.xml.vertex);
free(glsl_shader->pass[i].source.xml.fragment);
}
free(glsl_shader->script);
free(glsl_shader);
glsl_shader = NULL;
}
static void gl_glsl_deinit(void)
{
glUseProgram(0);
for (unsigned i = 0; i < GFX_MAX_SHADERS; i++)
{
if (gl_program[i] == 0 || (i && gl_program[i] == gl_program[0]))
continue;
gl_glsl_delete_shader(gl_program[i]);
}
if (glsl_shader && glsl_shader->luts)
glDeleteTextures(glsl_shader->luts, gl_teximage);
memset(gl_program, 0, sizeof(gl_program));
memset(gl_uniforms, 0, sizeof(gl_uniforms));
glsl_enable = false;
active_index = 0;
gl_glsl_free_shader();
if (gl_state_tracker)
state_tracker_free(gl_state_tracker);
gl_state_tracker = NULL;
gl_glsl_reset_attrib();
for (unsigned i = 0; i < GFX_MAX_SHADERS; i++)
{
if (glsl_vbo[i].vbo_primary)
glDeleteBuffers(1, &glsl_vbo[i].vbo_primary);
if (glsl_vbo[i].vbo_secondary)
glDeleteBuffers(1, &glsl_vbo[i].vbo_secondary);
}
memset(&glsl_vbo, 0, sizeof(glsl_vbo));
}
static bool gl_glsl_init(const char *path)
{
#ifndef HAVE_OPENGLES2
RARCH_LOG("Checking GLSL shader support ...\n");
bool shader_support = glCreateProgram && glUseProgram && glCreateShader
&& glDeleteShader && glShaderSource && glCompileShader && glAttachShader
&& glDetachShader && glLinkProgram && glGetUniformLocation
&& glUniform1i && glUniform1f && glUniform2fv && glUniform4fv && glUniformMatrix4fv
&& glGetShaderiv && glGetShaderInfoLog && glGetProgramiv && glGetProgramInfoLog
&& glDeleteProgram && glGetAttachedShaders
&& glGetAttribLocation && glEnableVertexAttribArray && glDisableVertexAttribArray
&& glVertexAttribPointer
&& glGenBuffers && glBufferData && glDeleteBuffers && glBindBuffer;
if (!shader_support)
{
RARCH_ERR("GLSL shaders aren't supported by your OpenGL driver.\n");
return false;
}
#endif
glsl_shader = (struct gfx_shader*)calloc(1, sizeof(*glsl_shader));
if (!glsl_shader)
return false;
if (path)
{
bool ret;
if (strcmp(path_get_extension(path), "glsl") == 0)
{
strlcpy(glsl_shader->pass[0].source.cg, path, sizeof(glsl_shader->pass[0].source.cg));
glsl_shader->passes = 1;
glsl_shader->modern = true;
ret = true;
}
else if (strcmp(path_get_extension(path), "glslp") == 0)
{
config_file_t *conf = config_file_new(path);
if (conf)
{
ret = gfx_shader_read_conf_cgp(conf, glsl_shader);
glsl_shader->modern = true;
config_file_free(conf);
}
else
ret = false;
}
else
ret = gfx_shader_read_xml(path, glsl_shader);
if (!ret)
{
RARCH_ERR("[GL]: Failed to parse GLSL shader.\n");
return false;
}
}
else
{
RARCH_WARN("[GL]: Stock GLSL shaders will be used.\n");
glsl_shader->passes = 1;
glsl_shader->pass[0].source.xml.vertex = strdup(glsl_core ? stock_vertex_core : stock_vertex_modern);
glsl_shader->pass[0].source.xml.fragment = strdup(glsl_core ? stock_fragment_core : stock_fragment_modern);
glsl_shader->modern = true;
}
gfx_shader_resolve_relative(glsl_shader, path);
const char *stock_vertex = glsl_shader->modern ?
stock_vertex_modern : stock_vertex_legacy;
const char *stock_fragment = glsl_shader->modern ?
stock_fragment_modern : stock_fragment_legacy;
if (glsl_core)
{
stock_vertex = stock_vertex_core;
stock_fragment = stock_fragment_core;
}
#ifdef HAVE_OPENGLES2
if (!glsl_shader->modern)
{
RARCH_ERR("[GL]: GLES context is used, but shader is not modern. Cannot use it.\n");
goto error;
}
#else
if (glsl_core && !glsl_shader->modern)
{
RARCH_ERR("[GL]: GL core context is used, but shader is not core compatible. Cannot use it.\n");
goto error;
}
#endif
if (!(gl_program[0] = compile_program(stock_vertex, stock_fragment, 0)))
{
RARCH_ERR("GLSL stock programs failed to compile.\n");
goto error;
}
if (!compile_programs(&gl_program[1]))
goto error;
if (!load_luts())
{
RARCH_ERR("[GL]: Failed to load LUTs.\n");
goto error;
}
for (unsigned i = 0; i <= glsl_shader->passes; i++)
find_uniforms(i, gl_program[i], &gl_uniforms[i]);
#ifdef GLSL_DEBUG
if (!gl_check_error())
RARCH_WARN("Detected GL error in GLSL.\n");
#endif
if (glsl_shader->variables)
{
struct state_tracker_info info = {0};
info.wram = (uint8_t*)pretro_get_memory_data(RETRO_MEMORY_SYSTEM_RAM);
info.info = glsl_shader->variable;
info.info_elem = glsl_shader->variables;
#ifdef HAVE_PYTHON
info.script = glsl_shader->script;
info.script_class = *glsl_shader->script_class ?
glsl_shader->script_class : NULL;
#endif
gl_state_tracker = state_tracker_init(&info);
if (!gl_state_tracker)
RARCH_WARN("Failed to init state tracker.\n");
}
glsl_enable = true;
gl_program[glsl_shader->passes + 1] = gl_program[0];
gl_uniforms[glsl_shader->passes + 1] = gl_uniforms[0];
if (glsl_shader->modern)
{
gl_program[GL_SHADER_STOCK_BLEND] = compile_program(glsl_core ? stock_vertex_core_blend : stock_vertex_modern_blend,
glsl_core ? stock_fragment_core_blend : stock_fragment_modern_blend, GL_SHADER_STOCK_BLEND);
find_uniforms(0, gl_program[GL_SHADER_STOCK_BLEND], &gl_uniforms[GL_SHADER_STOCK_BLEND]);
}
else
{
gl_program[GL_SHADER_STOCK_BLEND] = gl_program[0];
gl_uniforms[GL_SHADER_STOCK_BLEND] = gl_uniforms[0];
}
gl_glsl_reset_attrib();
for (unsigned i = 0; i < GFX_MAX_SHADERS; i++)
{
glGenBuffers(1, &glsl_vbo[i].vbo_primary);
glGenBuffers(1, &glsl_vbo[i].vbo_secondary);
}
return true;
error:
gl_glsl_deinit();
return false;
}
static void gl_glsl_set_params(unsigned width, unsigned height,
unsigned tex_width, unsigned tex_height,
unsigned out_width, unsigned out_height,
unsigned frame_count,
const struct gl_tex_info *info,
const struct gl_tex_info *prev_info,
const struct gl_tex_info *fbo_info, unsigned fbo_info_cnt)
{
// We enforce a certain layout for our various texture types in the texunits.
// - Regular frame (Texture) (always bound).
// - LUT textures (always bound).
// - Original texture (always bound if meaningful).
// - FBO textures (always bound if available).
// - Previous textures.
if (!glsl_enable || (gl_program[active_index] == 0))
return;
GLfloat buffer[128];
size_t size = 0;
struct glsl_attrib attribs[32];
size_t attribs_size = 0;
struct glsl_attrib *attr = attribs;
const struct shader_uniforms *uni = &gl_uniforms[active_index];
float input_size[2] = {(float)width, (float)height};
float output_size[2] = {(float)out_width, (float)out_height};
float texture_size[2] = {(float)tex_width, (float)tex_height};
if (uni->input_size >= 0)
glUniform2fv(uni->input_size, 1, input_size);
if (uni->output_size >= 0)
glUniform2fv(uni->output_size, 1, output_size);
if (uni->texture_size >= 0)
glUniform2fv(uni->texture_size, 1, texture_size);
if (uni->frame_count >= 0 && active_index)
{
unsigned modulo = glsl_shader->pass[active_index - 1].frame_count_mod;
if (modulo)
frame_count %= modulo;
glUniform1i(uni->frame_count, frame_count);
}
if (uni->frame_direction >= 0)
glUniform1i(uni->frame_direction, g_extern.frame_is_reverse ? -1 : 1);
for (unsigned i = 0; i < glsl_shader->luts; i++)
{
if (uni->lut_texture[i] >= 0)
{
// Have to rebind as HW render could override this.
glActiveTexture(GL_TEXTURE0 + i + 1);
glBindTexture(GL_TEXTURE_2D, gl_teximage[i]);
glUniform1i(uni->lut_texture[i], i + 1);
}
}
unsigned texunit = glsl_shader->luts + 1;
// Set original texture unless we're in first pass (pointless).
if (active_index > 1)
{
if (uni->orig.texture >= 0)
{
// Bind original texture.
glActiveTexture(GL_TEXTURE0 + texunit);
glUniform1i(uni->orig.texture, texunit);
glBindTexture(GL_TEXTURE_2D, info->tex);
}
texunit++;
if (uni->orig.texture_size >= 0)
glUniform2fv(uni->orig.texture_size, 1, info->tex_size);
if (uni->orig.input_size >= 0)
glUniform2fv(uni->orig.input_size, 1, info->input_size);
// Pass texture coordinates.
if (uni->orig.tex_coord >= 0)
{
attr->loc = uni->orig.tex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, info->coord, 8 * sizeof(GLfloat));
size += 8;
}
// Bind new texture in the chain.
if (fbo_info_cnt > 0)
{
glActiveTexture(GL_TEXTURE0 + texunit + fbo_info_cnt - 1);
glBindTexture(GL_TEXTURE_2D, fbo_info[fbo_info_cnt - 1].tex);
}
// Bind FBO textures.
for (unsigned i = 0; i < fbo_info_cnt; i++)
{
if (uni->pass[i].texture)
glUniform1i(uni->pass[i].texture, texunit);
texunit++;
if (uni->pass[i].texture_size >= 0)
glUniform2fv(uni->pass[i].texture_size, 1, fbo_info[i].tex_size);
if (uni->pass[i].input_size >= 0)
glUniform2fv(uni->pass[i].input_size, 1, fbo_info[i].input_size);
if (uni->pass[i].tex_coord >= 0)
{
attr->loc = uni->pass[i].tex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, fbo_info[i].coord, 8 * sizeof(GLfloat));
size += 8;
}
}
}
else
{
// First pass, so unbind everything to avoid collitions.
// Unbind ORIG.
glActiveTexture(GL_TEXTURE0 + texunit);
glBindTexture(GL_TEXTURE_2D, 0);
GLuint base_tex = texunit + 1;
// Unbind any lurking FBO passes.
// Rendering to a texture that is bound to a texture unit
// sounds very shaky ... ;)
for (unsigned i = 0; i < glsl_shader->passes; i++)
{
glActiveTexture(GL_TEXTURE0 + base_tex + i);
glBindTexture(GL_TEXTURE_2D, 0);
}
}
// Set previous textures. Only bind if they're actually used.
for (unsigned i = 0; i < PREV_TEXTURES; i++)
{
if (uni->prev[i].texture >= 0)
{
glActiveTexture(GL_TEXTURE0 + texunit);
glBindTexture(GL_TEXTURE_2D, prev_info[i].tex);
glUniform1i(uni->prev[i].texture, texunit++);
}
texunit++;
if (uni->prev[i].texture_size >= 0)
glUniform2fv(uni->prev[i].texture_size, 1, prev_info[i].tex_size);
if (uni->prev[i].input_size >= 0)
glUniform2fv(uni->prev[i].input_size, 1, prev_info[i].input_size);
// Pass texture coordinates.
if (uni->prev[i].tex_coord >= 0)
{
attr->loc = uni->prev[i].tex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, prev_info[i].coord, 8 * sizeof(GLfloat));
size += 8;
}
}
if (size)
{
gl_glsl_set_attribs(glsl_vbo[active_index].vbo_secondary,
glsl_vbo[active_index].buffer_secondary,
&glsl_vbo[active_index].size_secondary,
buffer, size, attribs, attribs_size);
}
glActiveTexture(GL_TEXTURE0);
if (gl_state_tracker)
{
static struct state_tracker_uniform info[GFX_MAX_VARIABLES];
static unsigned cnt = 0;
if (active_index == 1)
cnt = state_get_uniform(gl_state_tracker, info, GFX_MAX_VARIABLES, frame_count);
for (unsigned i = 0; i < cnt; i++)
{
int location = glGetUniformLocation(gl_program[active_index], info[i].id);
glUniform1f(location, info[i].value);
}
}
}
static bool gl_glsl_set_mvp(const math_matrix *mat)
{
if (!glsl_enable || !glsl_shader->modern)
return false;
int loc = gl_uniforms[active_index].mvp;
if (loc >= 0)
glUniformMatrix4fv(loc, 1, GL_FALSE, mat->data);
return true;
}
static bool gl_glsl_set_coords(const struct gl_coords *coords)
{
if (!glsl_enable || !glsl_shader->modern)
return false;
GLfloat buffer[128];
size_t size = 0;
struct glsl_attrib attribs[4];
size_t attribs_size = 0;
struct glsl_attrib *attr = attribs;
const struct shader_uniforms *uni = &gl_uniforms[active_index];
if (uni->tex_coord >= 0)
{
attr->loc = uni->tex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, coords->tex_coord, 8 * sizeof(GLfloat));
size += 8;
}
if (uni->vertex_coord >= 0)
{
attr->loc = uni->vertex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, coords->vertex, 8 * sizeof(GLfloat));
size += 8;
}
if (uni->color >= 0)
{
attr->loc = uni->color;
attr->size = 4;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, coords->color, 16 * sizeof(GLfloat));
size += 16;
}
if (uni->lut_tex_coord >= 0)
{
attr->loc = uni->lut_tex_coord;
attr->size = 2;
attr->offset = size * sizeof(GLfloat);
attribs_size++;
attr++;
memcpy(buffer + size, coords->lut_tex_coord, 8 * sizeof(GLfloat));
size += 8;
}
if (size)
{
gl_glsl_set_attribs(glsl_vbo[active_index].vbo_primary,
glsl_vbo[active_index].buffer_primary,
&glsl_vbo[active_index].size_primary,
buffer, size,
attribs, attribs_size);
}
return true;
}
static void gl_glsl_use(unsigned index)
{
if (glsl_enable)
{
gl_glsl_reset_attrib();
active_index = index;
glUseProgram(gl_program[index]);
}
}
static unsigned gl_glsl_num(void)
{
return glsl_shader->passes;
}
static bool gl_glsl_filter_type(unsigned index, bool *smooth)
{
if (glsl_enable && index)
{
if (glsl_shader->pass[index - 1].filter == RARCH_FILTER_UNSPEC)
return false;
*smooth = glsl_shader->pass[index - 1].filter == RARCH_FILTER_LINEAR;
return true;
}
else
return false;
}
static enum gfx_wrap_type gl_glsl_wrap_type(unsigned index)
{
if (glsl_enable && index)
return glsl_shader->pass[index - 1].wrap;
else
return RARCH_WRAP_BORDER;
}
static void gl_glsl_shader_scale(unsigned index, struct gfx_fbo_scale *scale)
{
if (glsl_enable && index)
*scale = glsl_shader->pass[index - 1].fbo;
else
scale->valid = false;
}
static unsigned gl_glsl_get_prev_textures(void)
{
if (!glsl_enable)
return 0;
unsigned max_prev = 0;
for (unsigned i = 1; i <= glsl_shader->passes; i++)
for (unsigned j = 0; j < PREV_TEXTURES; j++)
if (gl_uniforms[i].prev[j].texture >= 0)
max_prev = max(j + 1, max_prev);
return max_prev;
}
void gl_glsl_set_get_proc_address(gfx_ctx_proc_t (*proc)(const char*))
{
glsl_get_proc_address = proc;
}
void gl_glsl_set_context_type(bool core_profile, unsigned major, unsigned minor)
{
glsl_core = core_profile;
glsl_major = major;
glsl_minor = minor;
}
const gl_shader_backend_t gl_glsl_backend = {
gl_glsl_init,
gl_glsl_deinit,
gl_glsl_set_params,
gl_glsl_use,
gl_glsl_num,
gl_glsl_filter_type,
gl_glsl_wrap_type,
gl_glsl_shader_scale,
gl_glsl_set_coords,
gl_glsl_set_mvp,
gl_glsl_get_prev_textures,
RARCH_SHADER_GLSL,
};
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