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/*
* Copyright © 2012 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 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/>.
*
* Authored by: Kevin DuBois <kevin.dubois@canonical.com>
*/
#include "graphics.h"
#include "mir_image.h"
#include <cmath>
#include <chrono>
namespace md=mir::draw;
static const GLchar *vtex_shader_src =
{
"attribute vec4 vPosition;\n"
"attribute vec4 uvCoord;\n"
"varying vec2 texcoord;\n"
"uniform float slide;\n"
"void main() {\n"
" gl_Position = vPosition;\n"
" texcoord = uvCoord.xy + vec2(slide);\n"
"}\n"
};
static const GLchar *frag_shader_src =
{
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D tex;\n"
"varying vec2 texcoord;\n"
"void main() {\n"
" gl_FragColor = texture2D(tex, texcoord);\n"
"}\n"
};
const GLint num_vertex = 4;
GLfloat vertex_data[] =
{
-0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, 0.0f, 1.0f,
};
GLfloat uv_data[] =
{
1.0f, 1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 0.0f
};
md::glAnimationBasic::glAnimationBasic()
: program(-1),
vPositionAttr(-1),
uvCoord(-1),
slideUniform(-1),
slide(0.0)
{
}
int md::glAnimationBasic::texture_width()
{
return mir_image.width;
}
int md::glAnimationBasic::texture_height()
{
return mir_image.height;
}
void md::glAnimationBasic::init_gl()
{
glClearColor(0.0, 1.0, 0.0, 1.0);
GLuint vtex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vtex_shader, 1, &vtex_shader_src, 0);
glCompileShader(vtex_shader);
GLuint frag_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(frag_shader, 1, &frag_shader_src, 0);
glCompileShader(frag_shader);
program = glCreateProgram();
glAttachShader(program, vtex_shader);
glAttachShader(program, frag_shader);
glLinkProgram(program);
vPositionAttr = glGetAttribLocation(program, "vPosition");
glVertexAttribPointer(vPositionAttr, 4, GL_FLOAT, GL_FALSE, 0, vertex_data);
uvCoord = glGetAttribLocation(program, "uvCoord");
glVertexAttribPointer(uvCoord, 4, GL_FLOAT, GL_FALSE, 0, uv_data);
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(
GL_TEXTURE_2D, 0, GL_RGBA,
mir_image.width, mir_image.height, 0,
GL_RGBA, GL_UNSIGNED_BYTE,
mir_image.pixel_data);
slideUniform = glGetUniformLocation(program, "slide");
}
void md::glAnimationBasic::render_gl()
{
glUseProgram(program);
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
glUniform1fv(slideUniform, 1, &slide);
glActiveTexture(GL_TEXTURE0);
glEnableVertexAttribArray(vPositionAttr);
glEnableVertexAttribArray(uvCoord);
glDrawArrays(GL_TRIANGLE_STRIP, 0, num_vertex);
glDisableVertexAttribArray(uvCoord);
glDisableVertexAttribArray(vPositionAttr);
}
void md::glAnimationBasic::step()
{
typedef std::chrono::high_resolution_clock hr_clock;
typedef std::chrono::duration<double> seconds_double;
auto elapsed = hr_clock::now().time_since_epoch();
auto elapsed_seconds = std::chrono::duration_cast<seconds_double>(elapsed).count();
double i;
/* slide increases 0.01 per 1/60s */
slide = modf(0.6 * elapsed_seconds, &i);
}
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