//
// Lol Engine - Fractal tutorial
//
// Copyright: (c) 2011 Sam Hocevar <sam@hocevar.net>
// This program is free software; you can redistribute it and/or
// modify it under the terms of the Do What The Fuck You Want To
// Public License, Version 2, as published by Sam Hocevar. See
// http://sam.zoy.org/projects/COPYING.WTFPL for more details.
//
#if defined HAVE_CONFIG_H
# include "config.h"
#endif
#include <cstring>
#include "core.h"
#include "lolgl.h"
#include "loldebug.h"
using namespace std;
using namespace lol;
#if USE_SDL && defined __APPLE__
# include <SDL_main.h>
#endif
#if defined _WIN32
# undef main /* FIXME: still needed? */
# include <direct.h>
#endif
class Fractal : public WorldEntity
{
public:
Fractal(ivec2 const &size)
{
m_size = size;
m_pixels = new u8vec4[size.x * size.y];
m_angle = 0.0f;
m_ready = false;
}
~Fractal()
{
delete m_pixels;
}
virtual void TickGame(float deltams)
{
WorldEntity::TickGame(deltams);
m_angle += deltams * 0.0005f;
cmplx r0(cosf(m_angle), 0.8f * sinf(m_angle));
for (int j = 0; j < m_size.y; j++)
for (int i = 0; i < m_size.x; i++)
{
float const maxlen = 32.0f;
int const colors = 16;
int const maxiter = 30;
cmplx x0(4.0f / m_size.x * i - 2.0f, 3.0f / m_size.y * j - 1.5f);
cmplx r = x0 * r0;
cmplx z;
int iter = maxiter;
for (z = r; iter && z.sqlen() < maxlen * maxlen; z = z * z + r)
--iter;
float f = iter % colors;
float n = z.len();
f += logf(logf(n) / logf(maxlen)) / logf(2.0f);
if (iter)
{
uint8_t red = 255 - f * (255.0f / (colors + 1));
uint8_t green = 255 - f * (255.0f / (colors + 1));
uint8_t blue = (f * 512.0f / (colors + 1) > 255)
? 511 - (f * 512.0f / (colors + 1)) : 255;
m_pixels[j * m_size.x + i] = u8vec4(red, green, blue, 0);
}
else
{
m_pixels[j * m_size.x + i] = u8vec4(0, 0, 0, 0);
}
}
}
virtual void TickDraw(float deltams)
{
WorldEntity::TickDraw(deltams);
static float const vertices[] =
{
-1.0f, -1.0f,
1.0f, -1.0f,
1.0f, 1.0f,
1.0f, 1.0f,
-1.0f, 1.0f,
-1.0f, -1.0f,
};
static float const texcoords[] =
{
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f,
};
if (!m_ready)
{
glGenTextures(1, &m_texid);
glBindTexture(GL_TEXTURE_2D, m_texid);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_size.x, m_size.y, 0,
GL_RGBA, GL_UNSIGNED_BYTE, m_pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
m_shader = Shader::Create(
#if !defined __CELLOS_LV2__
"#version 120\n"
"attribute vec2 in_TexCoord;\n"
"attribute vec2 in_Vertex;"
"void main(void) {"
" gl_Position = vec4(in_Vertex, 0.0, 1.0);"
" gl_TexCoord[0] = vec4(in_TexCoord, 0.0, 0.0);\n"
"}",
"#version 120\n"
"uniform sampler2D in_Texture;\n"
"void main(void) {"
" gl_FragColor = texture2D(in_Texture, gl_TexCoord[0].xy);"
"}"
#else
"void main(float4 in_Position : POSITION,"
" float2 in_TexCoord : TEXCOORD0,"
" out float4 out_Position : POSITION,"
" out float2 out_TexCoord : TEXCOORD0)"
"{"
" out_TexCoord = in_TexCoord;"
" out_Position = in_Position;"
"}",
"void main(float2 in_TexCoord : TEXCOORD0,"
" uniform sampler2D tex,"
" out float4 out_FragColor : COLOR)"
"{"
" out_FragColor = tex2D(tex, in_TexCoord);"
"}"
#endif
);
m_vertexattrib = m_shader->GetAttribLocation("in_Vertex");
m_texattrib = m_shader->GetAttribLocation("in_TexCoord");
m_ready = true;
#if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
/* Method 1: store vertex buffer on the GPU memory */
glGenBuffers(1, &m_vbo);
glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices,
GL_STATIC_DRAW);
glGenBuffers(1, &m_tbo);
glBindBuffer(GL_ARRAY_BUFFER, m_tbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(texcoords), texcoords,
GL_STATIC_DRAW);
#elif !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
/* Method 2: upload vertex information at each frame */
#else
#endif
/* FIXME: this object never cleans up */
}
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_texid);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_size.x, m_size.y,
#if !defined __CELLOS_LV2__
GL_RGBA, GL_UNSIGNED_BYTE,
#else
/* The PS3 is big-endian */
GL_RGBA, GL_UNSIGNED_INT_8_8_8_8,
#endif
m_pixels);
m_shader->Bind();
#if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
glEnableVertexAttribArray(m_vertexattrib);
glVertexAttribPointer(m_vertexattrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, m_tbo);
glEnableVertexAttribArray(m_texattrib);
glVertexAttribPointer(m_texattrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
#elif !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
/* Never used for now */
//glEnableVertexAttribArray(m_vertexattrib);
//glVertexAttribPointer(m_vertexattrib, 2, GL_FLOAT, GL_FALSE, 0, vertices);
#else
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, vertices);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, texcoords);
#endif
glDrawArrays(GL_TRIANGLES, 0, 6);
#if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
glDisableVertexAttribArray(m_vertexattrib);
glDisableVertexAttribArray(m_texattrib);
glBindBuffer(GL_ARRAY_BUFFER, 0);
#elif !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
/* Never used for now */
//glDisableVertexAttribArray(m_vertexattrib);
//glDisableVertexAttribArray(m_texattrib);
#else
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
#endif
}
private:
ivec2 m_size;
u8vec4 *m_pixels;
Shader *m_shader;
GLuint m_texid;
#if !defined __CELLOS_LV2__ && !defined __ANDROID__ && !defined __APPLE__
GLuint m_vbo, m_tbo;
GLuint m_tco;
#endif
int m_vertexattrib, m_texattrib;
float m_angle;
bool m_ready;
};
int main()
{
#if defined _WIN32
_chdir("../..");
#endif
Application app("Tutorial 3: Fractal", ivec2(640, 480), 60.0f);
new DebugFps(5, 5);
new Fractal(ivec2(640, 480));
app.Run();
return EXIT_SUCCESS;
}