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/*
* This file is part of NumptyPhysics <http://thp.io/2015/numptyphysics/>
* Coyright (c) 2014 Thomas Perl <m@thp.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 3 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.
*/
#include "glaserl_program.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static GLuint
make_shader(GLenum type, const char *source)
{
GLuint shader = glCreateShader(type);
const char *shader_src[] = { GLASERL_GLSL_PRECISION_INFO, source };
glShaderSource(shader, 2, shader_src, 0);
glCompileShader(shader);
GLint result = GL_FALSE;
glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
if (!result) {
GLint size = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &size);
char *tmp = (char *)malloc(size);
glGetShaderInfoLog(shader, size, NULL, tmp);
printf("Failed to link shader: %s\n", tmp);
free(tmp);
exit(0);
}
return shader;
}
static GLuint
make_program(const char *vertex_shader, const char *fragment_shader)
{
GLuint program = glCreateProgram();
glAttachShader(program, make_shader(GL_VERTEX_SHADER, vertex_shader));
glAttachShader(program, make_shader(GL_FRAGMENT_SHADER, fragment_shader));
glLinkProgram(program);
GLint result = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &result);
if (!result) {
printf("Failed to link program!\n");
exit(0);
}
return program;
}
glaserl_program_t *
glaserl_program_new(const char *vertex_shader_src,
const char *fragment_shader_src, ...)
{
va_list args;
va_start(args, fragment_shader_src);
return glaserl_program_newv(vertex_shader_src, fragment_shader_src, args);
}
glaserl_program_t *
glaserl_program_newv(const char *vertex_shader_src,
const char *fragment_shader_src, va_list args)
{
glaserl_program_t *program;
int i;
program = (glaserl_program_t *)calloc(sizeof(glaserl_program_t), 1);
program->program = make_program(vertex_shader_src, fragment_shader_src);
program->stride = 0;
// Attributes
i = 0;
for (;;) {
const char *name = va_arg(args, const char *);
if (name == NULL) {
break;
}
int size = va_arg(args, int);
program->attributes[i].name = strdup(name);
program->attributes[i].size = size;
program->attributes[i].location =
glGetAttribLocation(program->program, name);
program->stride += size * sizeof(float);
i++;
}
// Uniforms
i = 0;
for (;;) {
const char *name = va_arg(args, const char *);
if (name == NULL) {
break;
}
program->uniforms[i].name = strdup(name);
program->uniforms[i].location =
glGetUniformLocation(program->program, name);
i++;
}
va_end(args);
return program;
}
void
glaserl_program_enable(glaserl_program_t *program)
{
glUseProgram(program->program);
glaserl_program_attrib_t *attr = program->attributes;
size_t offset = 0;
float *fbuffer = 0;
while (attr && attr->name) {
glEnableVertexAttribArray(attr->location);
glVertexAttribPointer(attr->location, attr->size,
GL_FLOAT, GL_FALSE, program->stride,
fbuffer + offset);
offset += attr->size;
attr++;
}
}
void
glaserl_program_disable(glaserl_program_t *program)
{
glaserl_program_attrib_t *attr = program->attributes;
while (attr && attr->name) {
glDisableVertexAttribArray(attr->location);
attr++;
}
glUseProgram(0);
}
GLint
glaserl_program_uniform_location(glaserl_program_t *program,
const char *uniform)
{
glaserl_program_uniform_t *unif = program->uniforms;
while (unif && unif->name) {
if (strcmp(unif->name, uniform) == 0) {
return unif->location;
}
unif++;
}
return -1;
}
void
glaserl_program_destroy(glaserl_program_t *program)
{
// TODO
}
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