plugins/gamma/aggregated.h

   1 #ifndef GAMMA_AGGREGATED
   2 #define GAMMA_AGGREGATED
   3
   4 // Gamma sections performed by other plugins
   5
   6 // Functions to get pixel from either previous effect or texture
   7 static char *gamma_get_pixel1 =
   8         "vec4 gamma_get_pixel()\n"
   9         "{\n"
  10         "       return gl_FragColor;\n"
  11         "}\n";
  12
  13 static char *gamma_get_pixel2 =
  14         "uniform sampler2D tex;\n"
  15         "vec4 gamma_get_pixel()\n"
  16         "{\n"
  17         "       return texture2D(tex, gl_TexCoord[0].st);\n"
  18         "}\n";
  19
  20 static char *gamma_pow_frag =
  21         "float my_pow(float x, float y, float max)\n"
  22         "{\n"
  23         "       return (x > 0.0) ? pow(x * 2.0 / max, y) : 0.0;\n"
  24         "}\n";
  25
  26 static char *gamma_rgb_frag =
  27         "uniform float gamma_scale;\n"
  28         "uniform float gamma_gamma;\n"
  29         "uniform float gamma_max;\n"
  30         "void main()\n"
  31         "{\n"
  32         "       vec4 pixel = gamma_get_pixel();\n"
  33         "       pixel.r = pixel.r * gamma_scale * my_pow(pixel.r, gamma_gamma, gamma_max);\n"
  34         "       pixel.g = pixel.g * gamma_scale * my_pow(pixel.g, gamma_gamma, gamma_max);\n"
  35         "       pixel.b = pixel.b * gamma_scale * my_pow(pixel.b, gamma_gamma, gamma_max);\n"
  36         "       gl_FragColor = pixel;\n"
  37         "}\n";
  38
  39 static char *gamma_yuv_frag =
  40         "uniform float gamma_scale;\n"
  41         "uniform float gamma_gamma;\n"
  42         "uniform float gamma_max;\n"
  43         "void main()\n"
  44         "{\n"
  45         "       vec4 pixel = gamma_get_pixel();\n"
  46                 YUV_TO_RGB_FRAG("pixel")
  47         "       pixel.r = pixel.r * gamma_scale * my_pow(pixel.r, gamma_gamma, gamma_max);\n"
  48         "       pixel.g = pixel.g * gamma_scale * my_pow(pixel.g, gamma_gamma, gamma_max);\n"
  49         "       pixel.b = pixel.b * gamma_scale * my_pow(pixel.b, gamma_gamma, gamma_max);\n"
  50                 RGB_TO_YUV_FRAG("pixel")
  51         "       gl_FragColor = pixel;\n"
  52         "}\n";
  53
  54 #define GAMMA_COMPILE(shader_stack, current_shader, aggregate_interpolation) \
  55 { \
  56         if(aggregate_interpolation) \
  57                 shader_stack[current_shader++] = gamma_get_pixel1; \
  58         else \
  59                 shader_stack[current_shader++] = gamma_get_pixel2; \
  60  \
  61         switch(get_output()->get_color_model()) \
  62         { \
  63                 case BC_YUV888: \
  64                 case BC_YUVA8888: \
  65                         shader_stack[current_shader++] = gamma_pow_frag; \
  66                         shader_stack[current_shader++] = gamma_yuv_frag; \
  67                         break; \
  68                 default: \
  69                         shader_stack[current_shader++] = gamma_pow_frag; \
  70                         shader_stack[current_shader++] = gamma_rgb_frag; \
  71                         break; \
  72         } \
  73 }
  74
  75 #define GAMMA_UNIFORMS(frag) \
  76 { \
  77         float max = get_output()->get_params()->get("GAMMA_MAX", (float)1); \
  78         float gamma = get_output()->get_params()->get("GAMMA_GAMMA", (float)1) - 1.0; \
  79         float scale = 1.0 / max; \
  80         glUniform1f(glGetUniformLocation(frag, "gamma_scale"), scale); \
  81         glUniform1f(glGetUniformLocation(frag, "gamma_gamma"), gamma); \
  82         glUniform1f(glGetUniformLocation(frag, "gamma_max"), max); \
  83 printf("GAMMA_UNIFORMS %f %f\n", max, gamma); \
  84 }
  85
  86
  87
  88
  89
  90 #endif