git.sesse.net Git - movit/blob - effect_chain.h

   1 #ifndef _EFFECT_CHAIN_H
   2 #define _EFFECT_CHAIN_H 1
   3
   4 #include <vector>
   5
   6 #include "effect.h"
   7 #include "effect_id.h"
   8
   9 enum PixelFormat { FORMAT_RGB, FORMAT_RGBA, FORMAT_BGR, FORMAT_BGRA };
  10
  11 enum ColorSpace {
  12         COLORSPACE_sRGB = 0,
  13         COLORSPACE_REC_709 = 0,  // Same as sRGB.
  14         COLORSPACE_REC_601_525 = 1,
  15         COLORSPACE_REC_601_625 = 2,
  16 };
  17
  18 enum GammaCurve {
  19         GAMMA_LINEAR = 0,
  20         GAMMA_sRGB = 1,
  21         GAMMA_REC_601 = 2,
  22         GAMMA_REC_709 = 2,  // Same as Rec. 601.
  23 };
  24
  25 struct ImageFormat {
  26         PixelFormat pixel_format;
  27         ColorSpace color_space;
  28         GammaCurve gamma_curve;
  29 };
  30
  31 class EffectChain {
  32 public:
  33         EffectChain(unsigned width, unsigned height);
  34
  35         // input, effects, output, finalize need to come in that specific order.
  36
  37         void add_input(const ImageFormat &format);
  38
  39         // The returned pointer is owned by EffectChain.
  40         Effect *add_effect(EffectId effect);
  41
  42         void add_output(const ImageFormat &format);
  43         void finalize();
  44
  45         //void render(unsigned char *src, unsigned char *dst);
  46         void render_to_screen(unsigned char *src);
  47
  48 private:
  49         struct Phase {
  50                 GLint glsl_program_num;
  51                 bool input_needs_mipmaps;
  52                 unsigned start, end;
  53         };
  54
  55         void normalize_to_linear_gamma();
  56         void normalize_to_srgb();
  57
  58         // Create a GLSL program computing effects [start, end>.
  59         Phase compile_glsl_program(unsigned start_index, unsigned end_index);
  60
  61         unsigned width, height;
  62         ImageFormat input_format, output_format;
  63         std::vector<Effect *> effects;
  64
  65         GLuint source_image_num;
  66         bool use_srgb_texture_format;
  67
  68         GLuint fbo;
  69         GLuint temp_textures[2];
  70
  71         std::vector<Phase> phases;
  72
  73         GLenum format, bytes_per_pixel;
  74         bool finalized;
  75
  76         // Used during the building of the effect chain.
  77         ColorSpace current_color_space;
  78         GammaCurve current_gamma_curve;
  79 };
  80
  81
  82 #endif // !defined(_EFFECT_CHAIN_H)