client/shaders/second_stage/opengl_vertex.glsl

   1 #ifdef ENABLE_AUTO_EXPOSURE
   2 #define exposureMap texture2
   3
   4 uniform sampler2D exposureMap;
   5
   6 varying float exposure;
   7 #endif
   8
   9 #ifdef GL_ES
  10 varying mediump vec2 varTexCoord;
  11 #else
  12 centroid varying vec2 varTexCoord;
  13 #endif
  14
  15 void main(void)
  16 {
  17 #ifdef ENABLE_AUTO_EXPOSURE
  18         // value in the texture is on a logarithtmic scale
  19         exposure = texture2D(exposureMap, vec2(0.5)).r;
  20         exposure = pow(2., exposure);
  21 #endif
  22
  23         varTexCoord.st = inTexCoord0.st;
  24         gl_Position = inVertexPosition;
  25 }