LookingGlass/client/renderers/EGL/shader.c

514 lines
14 KiB
C

/**
* Looking Glass
* Copyright © 2017-2022 The Looking Glass Authors
* https://looking-glass.io
*
* This program 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 Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "shader.h"
#include "common/debug.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
struct EGL_Shader
{
bool hasShader;
GLuint shader;
EGL_Uniform * uniforms;
int uniformCount;
int uniformUsed;
};
bool egl_shaderInit(EGL_Shader ** this)
{
*this = calloc(1, sizeof(EGL_Shader));
if (!*this)
{
DEBUG_ERROR("Failed to malloc EGL_Shader");
return false;
}
return true;
}
void egl_shaderFree(EGL_Shader ** shader)
{
EGL_Shader * this = *shader;
if (!this)
return;
if (this->hasShader)
glDeleteProgram(this->shader);
egl_shaderFreeUniforms(this);
free(this->uniforms);
free(this);
*shader = NULL;
}
bool egl_shaderLoad(EGL_Shader * this, const char * vertex_file, const char * fragment_file)
{
char * vertex_code, * fragment_code;
size_t vertex_size, fragment_size;
if (!util_fileGetContents(vertex_file, &vertex_code, &vertex_size))
{
DEBUG_ERROR("Failed to read vertex shader");
return false;
}
DEBUG_INFO("Loaded vertex shader: %s", vertex_file);
if (!util_fileGetContents(fragment_file, &fragment_code, &fragment_size))
{
DEBUG_ERROR("Failed to read fragment shader");
free(vertex_code);
return false;
}
DEBUG_INFO("Loaded fragment shader: %s", fragment_file);
bool ret = egl_shaderCompile(this, vertex_code, vertex_size, fragment_code, fragment_size);
free(vertex_code);
free(fragment_code);
return ret;
}
bool egl_shaderCompile(EGL_Shader * this, const char * vertex_code,
size_t vertex_size, const char * fragment_code, size_t fragment_size)
{
if (this->hasShader)
{
glDeleteProgram(this->shader);
this->hasShader = false;
}
GLint length;
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
length = vertex_size;
glShaderSource(vertexShader, 1, (const char**)&vertex_code, &length);
glCompileShader(vertexShader);
GLint result = GL_FALSE;
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &result);
if (result == GL_FALSE)
{
DEBUG_ERROR("Failed to compile vertex shader");
int logLength;
glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0)
{
char *log = malloc(logLength + 1);
if (!log)
DEBUG_ERROR("out of memory");
else
{
glGetShaderInfoLog(vertexShader, logLength, NULL, log);
log[logLength] = 0;
DEBUG_ERROR("%s", log);
free(log);
}
}
glDeleteShader(vertexShader);
return false;
}
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
length = fragment_size;
glShaderSource(fragmentShader, 1, (const char**)&fragment_code, &length);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &result);
if (result == GL_FALSE)
{
DEBUG_ERROR("Failed to compile fragment shader");
int logLength;
glGetShaderiv(fragmentShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0)
{
char *log = malloc(logLength + 1);
if (!log)
DEBUG_ERROR("out of memory");
else
{
glGetShaderInfoLog(fragmentShader, logLength, NULL, log);
log[logLength] = 0;
DEBUG_ERROR("%s", log);
free(log);
}
}
glDeleteShader(fragmentShader);
glDeleteShader(vertexShader );
return false;
}
this->shader = glCreateProgram();
glAttachShader(this->shader, vertexShader );
glAttachShader(this->shader, fragmentShader);
glLinkProgram(this->shader);
glGetProgramiv(this->shader, GL_LINK_STATUS, &result);
if (result == GL_FALSE)
{
DEBUG_ERROR("Failed to link shader program");
int logLength;
glGetProgramiv(this->shader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0)
{
char *log = malloc(logLength + 1);
glGetProgramInfoLog(this->shader, logLength, NULL, log);
log[logLength] = 0;
DEBUG_ERROR("%s", log);
free(log);
}
glDetachShader(this->shader, vertexShader );
glDetachShader(this->shader, fragmentShader);
glDeleteShader(fragmentShader);
glDeleteShader(vertexShader );
glDeleteProgram(this->shader );
return false;
}
glDetachShader(this->shader, vertexShader );
glDetachShader(this->shader, fragmentShader);
glDeleteShader(fragmentShader);
glDeleteShader(vertexShader );
this->hasShader = true;
return true;
}
void egl_shaderSetUniforms(EGL_Shader * this, EGL_Uniform * uniforms, int count)
{
egl_shaderFreeUniforms(this);
if (count > this->uniformCount)
{
free(this->uniforms);
this->uniforms = malloc(sizeof(*this->uniforms) * count);
if (!this->uniforms)
{
DEBUG_ERROR("out of memory");
return;
}
this->uniformCount = count;
}
this->uniformUsed = count;
memcpy(this->uniforms, uniforms, sizeof(*this->uniforms) * count);
for(int i = 0; i < this->uniformUsed; ++i)
{
switch(this->uniforms[i].type)
{
case EGL_UNIFORM_TYPE_1FV:
case EGL_UNIFORM_TYPE_2FV:
case EGL_UNIFORM_TYPE_3FV:
case EGL_UNIFORM_TYPE_4FV:
case EGL_UNIFORM_TYPE_1IV:
case EGL_UNIFORM_TYPE_2IV:
case EGL_UNIFORM_TYPE_3IV:
case EGL_UNIFORM_TYPE_4IV:
case EGL_UNIFORM_TYPE_1UIV:
case EGL_UNIFORM_TYPE_2UIV:
case EGL_UNIFORM_TYPE_3UIV:
case EGL_UNIFORM_TYPE_4UIV:
countedBufferAddRef(this->uniforms[i].v);
break;
case EGL_UNIFORM_TYPE_M2FV:
case EGL_UNIFORM_TYPE_M3FV:
case EGL_UNIFORM_TYPE_M4FV:
case EGL_UNIFORM_TYPE_M2x3FV:
case EGL_UNIFORM_TYPE_M3x2FV:
case EGL_UNIFORM_TYPE_M2x4FV:
case EGL_UNIFORM_TYPE_M4x2FV:
case EGL_UNIFORM_TYPE_M3x4FV:
case EGL_UNIFORM_TYPE_M4x3FV:
countedBufferAddRef(this->uniforms[i].m.v);
break;
default:
break;
}
}
};
void egl_shaderFreeUniforms(EGL_Shader * this)
{
for(int i = 0; i < this->uniformUsed; ++i)
{
switch(this->uniforms[i].type)
{
case EGL_UNIFORM_TYPE_1FV:
case EGL_UNIFORM_TYPE_2FV:
case EGL_UNIFORM_TYPE_3FV:
case EGL_UNIFORM_TYPE_4FV:
case EGL_UNIFORM_TYPE_1IV:
case EGL_UNIFORM_TYPE_2IV:
case EGL_UNIFORM_TYPE_3IV:
case EGL_UNIFORM_TYPE_4IV:
case EGL_UNIFORM_TYPE_1UIV:
case EGL_UNIFORM_TYPE_2UIV:
case EGL_UNIFORM_TYPE_3UIV:
case EGL_UNIFORM_TYPE_4UIV:
countedBufferRelease(&this->uniforms[i].v);
break;
case EGL_UNIFORM_TYPE_M2FV:
case EGL_UNIFORM_TYPE_M3FV:
case EGL_UNIFORM_TYPE_M4FV:
case EGL_UNIFORM_TYPE_M2x3FV:
case EGL_UNIFORM_TYPE_M3x2FV:
case EGL_UNIFORM_TYPE_M2x4FV:
case EGL_UNIFORM_TYPE_M4x2FV:
case EGL_UNIFORM_TYPE_M3x4FV:
case EGL_UNIFORM_TYPE_M4x3FV:
countedBufferRelease(&this->uniforms[i].m.v);
break;
default:
break;
}
}
this->uniformUsed = 0;
}
void egl_shaderUse(EGL_Shader * this)
{
if (this->hasShader)
glUseProgram(this->shader);
else
DEBUG_ERROR("Shader program has not been compiled");
for(int i = 0; i < this->uniformUsed; ++i)
{
EGL_Uniform * uniform = &this->uniforms[i];
switch(uniform->type)
{
case EGL_UNIFORM_TYPE_1F:
glUniform1f(uniform->location, uniform->f[0]);
break;
case EGL_UNIFORM_TYPE_2F:
glUniform2f(uniform->location, uniform->f[0], uniform->f[1]);
break;
case EGL_UNIFORM_TYPE_3F:
glUniform3f(uniform->location, uniform->f[0], uniform->f[1],
uniform->f[2]);
break;
case EGL_UNIFORM_TYPE_4F:
glUniform4f(uniform->location, uniform->f[0], uniform->f[1],
uniform->f[2], uniform->f[3]);
break;
case EGL_UNIFORM_TYPE_1I:
glUniform1i(uniform->location, uniform->i[0]);
break;
case EGL_UNIFORM_TYPE_2I:
glUniform2i(uniform->location, uniform->i[0], uniform->i[1]);
break;
case EGL_UNIFORM_TYPE_3I:
glUniform3i(uniform->location, uniform->i[0], uniform->i[1],
uniform->i[2]);
break;
case EGL_UNIFORM_TYPE_4I:
glUniform4i(uniform->location, uniform->i[0], uniform->i[1],
uniform->i[2], uniform->i[3]);
break;
case EGL_UNIFORM_TYPE_1UI:
glUniform1ui(uniform->location, uniform->ui[0]);
break;
case EGL_UNIFORM_TYPE_2UI:
glUniform2ui(uniform->location, uniform->ui[0], uniform->ui[1]);
break;
case EGL_UNIFORM_TYPE_3UI:
glUniform3ui(uniform->location, uniform->ui[0], uniform->ui[1],
uniform->ui[2]);
break;
case EGL_UNIFORM_TYPE_4UI:
glUniform4ui(uniform->location, uniform->ui[0], uniform->ui[1],
uniform->ui[2], uniform->ui[3]);
break;
case EGL_UNIFORM_TYPE_1FV:
glUniform1fv(uniform->location, uniform->v->size / sizeof(GLfloat),
(const GLfloat *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_2FV:
glUniform2fv(uniform->location, uniform->v->size / sizeof(GLfloat) / 2,
(const GLfloat *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_3FV:
glUniform3fv(uniform->location, uniform->v->size / sizeof(GLfloat) / 3,
(const GLfloat *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_4FV:
glUniform4fv(uniform->location, uniform->v->size / sizeof(GLfloat) / 4,
(const GLfloat *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_1IV:
glUniform1iv(uniform->location, uniform->v->size / sizeof(GLint),
(const GLint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_2IV:
glUniform2iv(uniform->location, uniform->v->size / sizeof(GLint) / 2,
(const GLint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_3IV:
glUniform3iv(uniform->location, uniform->v->size / sizeof(GLint) / 3,
(const GLint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_4IV:
glUniform4iv(uniform->location, uniform->v->size / sizeof(GLint) / 4,
(const GLint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_1UIV:
glUniform1uiv(uniform->location, uniform->v->size / sizeof(GLuint),
(const GLuint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_2UIV:
glUniform2uiv(uniform->location, uniform->v->size / sizeof(GLuint) / 2,
(const GLuint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_3UIV:
glUniform3uiv(uniform->location, uniform->v->size / sizeof(GLuint) / 3,
(const GLuint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_4UIV:
glUniform4uiv(uniform->location, uniform->v->size / sizeof(GLuint) / 4,
(const GLuint *)uniform->v->data);
break;
case EGL_UNIFORM_TYPE_M2FV:
glUniformMatrix2fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 2,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M3FV:
glUniformMatrix3fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 3,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M4FV:
glUniformMatrix4fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 4,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M2x3FV:
glUniformMatrix2x3fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 6,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M3x2FV:
glUniformMatrix3x2fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 6,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M2x4FV:
glUniformMatrix2x4fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 8,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M4x2FV:
glUniformMatrix4x2fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 8,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M3x4FV:
glUniformMatrix3x4fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 12,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
case EGL_UNIFORM_TYPE_M4x3FV:
glUniformMatrix4x3fv(uniform->location,
uniform->v->size / sizeof(GLfloat) / 12,
uniform->m.transpose, (const GLfloat *)uniform->m.v->data);
break;
}
}
}
void egl_shaderAssocTextures(EGL_Shader * this, const int count)
{
char name[] = "sampler1";
glUseProgram(this->shader);
for(int i = 0; i < count; ++i, name[7]++)
{
GLint loc = glGetUniformLocation(this->shader, name);
if (loc == -1)
{
DEBUG_WARN("Shader uniform location `%s` not found", name);
continue;
}
glUniform1i(loc, i);
}
glUseProgram(0);
}
GLint egl_shaderGetUniform(EGL_Shader * this, const char * name)
{
if (!this->shader)
{
DEBUG_ERROR("Shader program has not been compiled");
return 0;
}
return glGetUniformLocation(this->shader, name);
}