#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include "main.h"

#define NULL ((void*)0)

void destroy_shader( unsigned int shader )
{ 
	return glDeleteProgram( shader );
}

unsigned int create_shader( void )
{
	return glCreateProgram();
}

void use_shader( unsigned int program )
{
	return glUseProgram( program );
}

unsigned char gload_program( unsigned int program, const char * src, 
	unsigned int i )
{
	int shader, status;
	unsigned int type[] = 
	{
		[VERTEX]=GL_VERTEX_SHADER,
		[FRAGMENT]=GL_FRAGMENT_SHADER 
	};


	if( !src )
		return 0;

	shader = glCreateShader(type[i]);
	glShaderSource( shader, 1, (const GLchar **)&src, NULL);
	glCompileShader(shader);
	glGetShaderiv( shader, GL_COMPILE_STATUS, &status );


	if( !status )
	{
#ifdef DEBUG
		char log[256];
		glGetShaderInfoLog( shader, 256, NULL, log );
#endif
		return 0;
	}

	glAttachShader(program, shader);
	glDeleteShader(shader);
	glLinkProgram(program);
	return 1;
}

void gload_float( unsigned int program, char * var, float f )
{
	glUseProgram( program );
	glUniform1f( glGetUniformLocation( program, var ), f ); 
}

void gload_mat4( unsigned int program, char * var, float * mat )
{
	glUseProgram( program );
	glUniformMatrix4fv( glGetUniformLocation( program, var ), 1, 0, mat ); 
}