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/*
* Copyright (C) 2018-2020 - Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <SDL.h>
#include <stage.h>
#include "glad.h"
#include "m4f.h"
#include "checker-node.h"
#include "shader-node.h"
#include "v3f.h"
static const char *checker_vs = ""
"#version 120\n"
"uniform mat4 model_x;"
"attribute vec3 i_vertex;"
"attribute vec2 i_texcoord;"
"void main()"
"{"
" gl_TexCoord[0].xy = i_texcoord;"
" gl_Position = model_x * vec4(i_vertex, 1.f);"
"}"
"";
static const char *checker_fs = ""
"#version 120\n"
"uniform float alpha;"
"uniform vec3 color;"
"void main()"
"{"
" int x = int(mod(gl_TexCoord[0].x * 20, 2));"
" int y = int(mod(gl_TexCoord[0].y * 20, 2));"
" if (x == y) {"
" gl_FragColor = vec4(1.f - color, alpha);"
" } else {"
" gl_FragColor = vec4(.25f * color, alpha);"
" }"
"}"
"";
static void checker_uniforms(shader_t *shader, void *uniforms_ctxt, void *render_ctxt, unsigned n_uniforms, const int *uniforms, const m4f_t *model_x, float alpha)
{
v3f_t *color = uniforms_ctxt;
glUniform1f(uniforms[0], alpha);
glUniformMatrix4fv(uniforms[1], 1, GL_FALSE, &model_x->m[0][0]);
glUniform3f(uniforms[2], color->x, color->y, color->z);
}
/* create checker icon rendering stage */
stage_t * checker_node_new(const stage_conf_t *conf, const m4f_t *model_x, const v3f_t *color)
{
assert(model_x);
assert(color);
return shader_node_new_src(conf, checker_vs, checker_fs, model_x, checker_uniforms, (void *)color, 3,
(const char *[]){
"alpha",
"model_x",
"color",
}
);
}
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