render.h

   1 #ifndef RENDER_H
   2 #define RENDER_H
   3 #define VG_3D
   4 #include "vg/vg.h"
   5
   6 static struct pipeline
   7 {
   8    float fov;
   9 }
  10 gpipeline;
  11
  12 static void render_water_texture( m4x3f camera );
  13 static void render_water_surface( m4x4f pv );
  14 static void render_world( m4x4f projection, m4x3f camera );
  15
  16 /*
  17  * http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
  18  */
  19 static void plane_clip_projection( m4x4f mat, v4f plane )
  20 {
  21    v4f c =
  22    {
  23       (vg_signf(plane[0]) + mat[2][0]) / mat[0][0],
  24       (vg_signf(plane[1]) + mat[2][1]) / mat[1][1],
  25       -1.0f,
  26       (1.0f + mat[2][2]) / mat[3][2]
  27    };
  28
  29    v4_muls( plane, 2.0f / v4_dot(plane,c), c );
  30
  31    mat[0][2] = c[0];
  32    mat[1][2] = c[1];
  33    mat[2][2] = c[2] + 1.0f;
  34    mat[3][2] = c[3];
  35 }
  36
  37 static void pipeline_projection( m4x4f mat, float nearz, float farz )
  38 {
  39    m4x4_projection( mat,
  40          gpipeline.fov,
  41          (float)vg_window_x / (float)vg_window_y,
  42          nearz, farz );
  43 }
  44
  45 static void create_renderbuffer_std( GLuint *fb, GLuint *rgb, GLuint *rb )
  46 {
  47    glGenFramebuffers( 1, fb );
  48    glBindFramebuffer( GL_FRAMEBUFFER, *fb );
  49
  50    glGenTextures( 1, rgb );
  51    glBindTexture( GL_TEXTURE_2D, *rgb );
  52    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, vg_window_x, vg_window_y,
  53          0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
  54
  55    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
  56    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
  57    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  58          GL_TEXTURE_2D, *rgb, 0);
  59
  60    /* TODO: Check for DEPTH32f availiblity and use if possible */
  61
  62    glGenRenderbuffers( 1, rb );
  63    glBindRenderbuffer( GL_RENDERBUFFER, *rb );
  64    glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH24_STENCIL8,
  65          vg_window_x, vg_window_y );
  66
  67    glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
  68          GL_RENDERBUFFER, *rb );
  69 }
  70
  71 static void resize_renderbuffer_std( GLuint *fb, GLuint *rgb, GLuint *rb )
  72 {
  73    glBindTexture( GL_TEXTURE_2D, *rgb );
  74    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, vg_window_x, vg_window_y, 0,
  75          GL_RGB, GL_UNSIGNED_BYTE, NULL );
  76
  77    glBindRenderbuffer( GL_RENDERBUFFER, *rb );
  78    glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH24_STENCIL8,
  79          vg_window_x, vg_window_y );
  80 }
  81
  82 #endif /* RENDER_H */