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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* shader.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/05/11 09:35:54 by charles #+# #+# */
/* Updated: 2020/05/11 10:54:14 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "scop.h"
#define SHADER_VERTEX_FILEPATH "shader/vertex.glsl"
#define SHADER_FRAGMENT_FILEPATH "shader/fragment.glsl"
static unsigned int st_compile(char *filepath, unsigned int type)
{
char *src;
unsigned int id;
int result;
int len;
char *msg;
if ((src = ft_getfile(open(filepath, O_RDONLY))) == NULL)
return (0);
GL_CALL(id = glCreateShader(type));
GL_CALL(glShaderSource(id, 1, (const char**)&src, NULL));
free(src);
GL_CALL(glCompileShader(id));
GL_CALL(glGetShaderiv(id, GL_COMPILE_STATUS, &result));
if (result == GL_FALSE)
{
GL_CALL(glGetShaderiv(id, GL_INFO_LOG_LENGTH, &len));
if ((msg = malloc(sizeof(char) * (len + 1))) == NULL)
return (0);
GL_CALL(glGetShaderInfoLog(id, len, &len, msg));
ft_putendl(msg);
free(msg);
GL_CALL(glDeleteShader(id));
return (0);
}
return (id);
}
unsigned int shader_new(void)
{
unsigned int shader_vertex;
unsigned int shader_fragment;
unsigned int program;
if ((shader_vertex = st_compile(SHADER_VERTEX_FILEPATH, GL_VERTEX_SHADER)) == 0
|| (shader_fragment = st_compile(SHADER_FRAGMENT_FILEPATH, GL_FRAGMENT_SHADER)) == 0)
return (0);
GL_CALL(program = glCreateProgram());
GL_CALL(glAttachShader(program, shader_vertex));
GL_CALL(glAttachShader(program, shader_fragment));
GL_CALL(glLinkProgram(program));
GL_CALL(glValidateProgram(program));
GL_CALL(glDeleteShader(shader_vertex));
GL_CALL(glDeleteShader(shader_fragment));
return (program);
}
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