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#include "shader.h"
#include <iostream>
static int setupShader(GLenum shaderType, const char *src)
{
GLuint shader = glCreateShader(shaderType);
glShaderSource(shader, 1, &src, nullptr);
glCompileShader(shader);
int status;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
char buf[1024];
glGetShaderInfoLog(shader, sizeof buf, nullptr, buf);
std::cerr << "Error: "
<< (shaderType == GL_VERTEX_SHADER ? "vertex" : "fragment")
<< " shader: compilation failed: "
<< buf
<< std::endl;
}
return shader;
}
Shader::Shader(const char *vertexSrc, const char *fragmentSrc, const char *geometrySrc)
{
GLuint vertex = setupShader(GL_VERTEX_SHADER, vertexSrc);
GLuint fragment = setupShader(GL_FRAGMENT_SHADER, fragmentSrc);
GLuint geometry;
if (geometrySrc != nullptr) {
geometry = setupShader(GL_GEOMETRY_SHADER, geometrySrc);
}
int status;
m_program = glCreateProgram();
glAttachShader(m_program, vertex);
glAttachShader(m_program, fragment);
if (geometrySrc != nullptr) {
glAttachShader(m_program, geometry);
}
glLinkProgram(m_program);
glGetProgramiv(m_program, GL_LINK_STATUS, &status);
if (status == GL_FALSE) {
char buf[1024];
glGetProgramInfoLog(m_program, sizeof buf, nullptr, buf);
std::cerr << "Error: shader linking failed: "
<< buf
<< std::endl;
}
if (geometrySrc != nullptr) {
glDeleteShader(geometry);
}
glDeleteShader(fragment);
glDeleteShader(vertex);
}
Shader::~Shader()
{
glDeleteProgram(m_program);
}
void Shader::use() const
{
glUseProgram(m_program);
}
void Shader::release() const
{
glUseProgram(0);
}
GLint Shader::uniformLocation(const char *name) const
{
return glGetUniformLocation(m_program, name);
}
void Shader::setUniform(GLint location, GLint value) const
{
glUniform1i(location, value);
}
void Shader::setUniform(GLint location, GLfloat value) const
{
glUniform1f(location, value);
}
void Shader::setUniform(GLint location, GLfloat mat[4][4]) const
{
// GL_FALSE for column-major
glUniformMatrix4fv(location, 1, GL_FALSE, &mat[0][0]);
}
void Shader::setUniform1dArray(GLint location, const GLfloat *values, int count) const
{
glUniform1fv(location, count, values);
}
void Shader::setUniform2dArray(GLint location, const GLfloat *values, int count) const
{
glUniform2fv(location, count, values);
}
void Shader::setUniform3dArray(GLint location, const GLfloat *values, int count) const
{
glUniform3fv(location, count, values);
}
void Shader::setUniform(const char *name, GLint value) const
{
setUniform(uniformLocation(name), value);
}
void Shader::setUniform(const char *name, GLfloat value) const
{
setUniform(uniformLocation(name), value);
}
void Shader::setUniform1dArray(const char *name, const GLfloat *values, int count) const
{
setUniform1dArray(uniformLocation(name), values, count);
}
void Shader::setUniform2dArray(const char *name, const GLfloat *values, int count) const
{
setUniform2dArray(uniformLocation(name), values, count);
}
void Shader::setUniform3dArray(const char *name, const GLfloat *values, int count) const
{
setUniform3dArray(uniformLocation(name), values, count);
}
void Shader::setUniform(const char *name, GLfloat mat[4][4]) const
{
setUniform(uniformLocation(name), mat);
}
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