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/*
Copyright 2019-2020 David Robillard <d@drobilla.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "glad/glad.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct
{
GLuint vertexShader;
GLuint fragmentShader;
GLuint program;
} Program;
static GLuint
compileShader(const char* header, const char* source, const GLenum type)
{
const GLchar* sources[] = {header, source};
const GLint lengths[] = {(GLint)strlen(header), (GLint)strlen(source)};
GLuint shader = glCreateShader(type);
glShaderSource(shader, 2, sources, lengths);
glCompileShader(shader);
int status = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
GLint length = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
char* log = (char*)calloc(1, (size_t)length);
glGetShaderInfoLog(shader, length, &length, log);
fprintf(stderr, "error: Failed to compile shader (%s)\n", log);
free(log);
return 0;
}
return shader;
}
static void
deleteProgram(Program program)
{
glDeleteShader(program.vertexShader);
glDeleteShader(program.fragmentShader);
glDeleteProgram(program.program);
}
static Program
compileProgram(const char* headerSource,
const char* vertexSource,
const char* fragmentSource)
{
static const Program nullProgram = {0, 0, 0};
Program program = {
compileShader(headerSource, vertexSource, GL_VERTEX_SHADER),
compileShader(headerSource, fragmentSource, GL_FRAGMENT_SHADER),
glCreateProgram(),
};
if (!program.vertexShader || !program.fragmentShader || !program.program) {
deleteProgram(program);
return nullProgram;
}
glAttachShader(program.program, program.vertexShader);
glAttachShader(program.program, program.fragmentShader);
glLinkProgram(program.program);
GLint status = 0;
glGetProgramiv(program.program, GL_LINK_STATUS, &status);
if (status == GL_FALSE) {
GLint length = 0;
glGetProgramiv(program.program, GL_INFO_LOG_LENGTH, &length);
char* log = (char*)calloc(1, (size_t)length);
glGetProgramInfoLog(program.program, length, &length, &log[0]);
fprintf(stderr, "error: Failed to link program (%s)\n", log);
free(log);
deleteProgram(program);
return nullProgram;
}
return program;
}
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