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/*
* Copyright © 2016 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or 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/>.
*
* Author: Kevin DuBois <kevin.dubois@canonical.com>
*/
#include "diamond.h"
#include "mir_egl_platform_shim.h"
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
int const num_vertices = 4;
GLfloat const vertices[] =
{
1.0f, 0.0f,
0.0f, 1.0f,
0.0f, -1.0f,
-1.0f, 0.0f,
};
GLfloat const texcoords[] =
{
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
};
static GLuint load_shader(const char *src, GLenum type)
{
GLuint shader = glCreateShader(type);
assert(shader);
GLint compiled;
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (!compiled)
{
GLchar log[1024];
glGetShaderInfoLog(shader, sizeof log - 1, NULL, log);
log[sizeof log - 1] = '\0';
printf("load_shader compile failed: %s\n", log);
glDeleteShader(shader);
shader = 0;
assert(-1);
}
return shader;
}
void render_diamond(Diamond* info, int width, int height)
{
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, width, height);
glDrawArrays(GL_TRIANGLE_STRIP, 0, info->num_vertices);
}
Diamond setup_diamond_common()
{
glClearColor(0.8f, 0.8f, 0.8f, 1.0f);
char const vertex_shader_src[] =
"attribute vec2 pos; \n"
"attribute vec2 texcoord; \n"
"varying vec2 v_texcoord; \n"
"void main() \n"
"{ \n"
" gl_Position = vec4(pos.x, pos.y, 0.0, 1.0); \n"
" v_texcoord = texcoord; \n"
"} \n";
char const fragment_shader_src[] =
"precision mediump float; \n"
"varying vec2 v_texcoord; \n"
"uniform sampler2D tex; \n"
"void main() \n"
"{ \n"
" gl_FragColor = texture2D(tex, v_texcoord); \n"
"} \n";
GLint linked = 0;
Diamond info;
info.vertex_shader = load_shader(vertex_shader_src, GL_VERTEX_SHADER);
info.fragment_shader = load_shader(fragment_shader_src, GL_FRAGMENT_SHADER);
info.program = glCreateProgram();
assert(info.program);
glAttachShader(info.program, info.vertex_shader);
glAttachShader(info.program, info.fragment_shader);
glLinkProgram(info.program);
glGetProgramiv(info.program, GL_LINK_STATUS, &linked);
if (!linked)
{
GLchar log[1024];
glGetProgramInfoLog(info.program, sizeof log - 1, NULL, log);
log[sizeof log - 1] = '\0';
printf("Link failed: %s\n", log);
assert(-1);
}
glUseProgram(info.program);
info.pos = glGetAttribLocation(info.program, "pos");
info.texuniform = glGetUniformLocation(info.program, "tex");
info.texcoord = glGetAttribLocation(info.program, "texcoord");
info.num_vertices = num_vertices;
glUniform1i(info.pos, 0);
glUniform1i(info.texuniform, 0);
glVertexAttribPointer(info.pos, 2, GL_FLOAT, GL_FALSE, 0, vertices);
glVertexAttribPointer(info.texcoord, 2, GL_FLOAT, GL_FALSE, 0, texcoords);
glEnableVertexAttribArray(info.pos);
glEnableVertexAttribArray(info.texcoord);
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &info.texid);
glBindTexture(GL_TEXTURE_2D, info.texid);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
return info;
}
Diamond setup_diamond_import(EGLImageKHR img, int use_shim)
{
Diamond diamond = setup_diamond_common();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (use_shim)
{
future_driver_glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, img);
}
else
{
PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES =
(PFNGLEGLIMAGETARGETTEXTURE2DOESPROC) eglGetProcAddress("glEGLImageTargetTexture2DOES");
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, img);
}
return diamond;
}
Diamond setup_diamond()
{
Diamond diamond = setup_diamond_common();
static unsigned char data[] = {
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x00, 0x00, 0xFF,
0xFF, 0x00, 0x00, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF
};
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(
GL_TEXTURE_2D, 0, GL_RGBA,
2, 2, 0,
GL_RGBA, GL_UNSIGNED_BYTE,
data);
return diamond;
}
void destroy_diamond(Diamond* info)
{
glDeleteTextures(1, &info->texid);
glDisableVertexAttribArray(info->pos);
glDisableVertexAttribArray(info->texcoord);
glDeleteShader(info->vertex_shader);
glDeleteShader(info->fragment_shader);
glDeleteProgram(info->program);
}
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