Update documentation, add example and install script.

[bold.git] / examples / flow2 / flow2.c

diff --git a/examples/flow2/flow2.c b/examples/flow2/flow2.c
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+
+// Linux x86_64 port of flow2, to be linked with the bold linker.
+// Ported by Amand Tihon (alrj).
+// Original comments in flow2 source code copied verbatim
+
+
+// Chris Thornborrow (auld/sek/taj/copabars)
+// If you use this code please credit...blahblah
+// Example OGL + shaders in 1k
+// Requires crinkler - magnificent tool
+// VS2005 modifications by benny!weltenkonstrukteur.de from dbf
+//    Greets!
+// NOTE: DX will beat this no problem at all due to OpenGL forced
+// to import shader calls as variables..nontheless we dont need
+// d3dxblahblah to be loaded on users machine.
+
+#include "GL/gl.h"
+#include "SDL.h"
+
+// NOTE: in glsl it is legal to have a fragment shader without a vertex shader
+//  Infact ATi/AMD  drivers allow this but unwisely forget to set up variables for
+// the fragment shader - thus all GLSL programs must have a vertex shader :-(
+// Thanks ATI/AMD
+
+// This is pretty dirty...note we do not transform the rectangle but we do use
+// glRotatef to pass in a value we can use to animate...avoids one more getProcAddress later
+const GLchar *vsh="\
+varying vec4 p;\
+void main(){\
+p=sin(gl_ModelViewMatrix[1]*9.0);\
+gl_Position=gl_Vertex;\
+}";
+
+// an iterative function for colour
+const GLchar *fsh="\
+varying vec4 p;\
+void main(){\
+float r,t,j;\
+vec4 v=gl_FragCoord/400.0-1.0;\
+r=v.x*p.r;\
+for(int j=0;j<7;j++){\
+t=v.x+p.r*p.g;\
+v.x=t*t-v.y*v.y+r;\
+v.y=p.g*3.0*t*v.y+v.y;\
+}\
+gl_FragColor=vec4(mix(p,vec4(t),max(t,v.x)));\
+}";
+//p.g*3.0*t*v.y+i;\
+
+static void setShaders() {
+
+  GLuint v = glCreateShader(GL_VERTEX_SHADER);
+  GLuint f = glCreateShader(GL_FRAGMENT_SHADER);
+  GLuint p = glCreateProgram();
+
+  glShaderSource(v, 1, &vsh, NULL);
+  glCompileShader(v);
+  glAttachShader(p, v);
+  glShaderSource(f, 1, &fsh, NULL);
+  glCompileShader(f);
+  glAttachShader(p, f);
+  glLinkProgram(p);
+  glUseProgram(p);
+}
+
+int main()
+{
+  static SDL_Event e;
+  SDL_Init(SDL_INIT_VIDEO);
+  SDL_SetVideoMode(1024, 768, 0, SDL_OPENGL);
+
+  SDL_ShowCursor(SDL_DISABLE);
+  setShaders();
+   //**********************
+   // NOW THE MAIN LOOP...
+   //**********************
+   // there is no depth test or clear screen...as we draw in order and cover
+   // the whole area of the screen.
+  do
+  {
+    glRotatef(0.3f, 1, 1, 1);
+    glRecti(-1, -1, 1, 1);
+    SDL_GL_SwapBuffers();
+    
+    SDL_PollEvent(&e);
+    
+    if (e.type == SDL_KEYDOWN)
+      break;
+  } while (e.type != SDL_QUIT);
+
+  return 0;
+}
+