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

   1 #define GL_GLEXT_PROTOTYPES 1
   2
   3 #include <stdio.h>
   4 #include <assert.h>
   5
   6 #include <GL/gl.h>
   7 #include <GL/glext.h>
   8
   9 #include "util.h"
  10 #include "effect_chain.h"
  11 #include "gamma_expansion_effect.h"
  12 #include "lift_gamma_gain_effect.h"
  13 #include "colorspace_conversion_effect.h"
  14
  15 EffectChain::EffectChain(unsigned width, unsigned height)
  16         : width(width), height(height), finalized(false) {}
  17
  18 void EffectChain::add_input(const ImageFormat &format)
  19 {
  20         input_format = format;
  21         current_color_space = format.color_space;
  22         current_gamma_curve = format.gamma_curve;
  23 }
  24
  25 void EffectChain::add_output(const ImageFormat &format)
  26 {
  27         output_format = format;
  28 }
  29
  30 Effect *instantiate_effect(EffectId effect)
  31 {
  32         switch (effect) {
  33         case GAMMA_CONVERSION:
  34                 return new GammaExpansionEffect();
  35         case RGB_PRIMARIES_CONVERSION:
  36                 return new GammaExpansionEffect();
  37         case LIFT_GAMMA_GAIN:
  38                 return new LiftGammaGainEffect();
  39         }
  40         assert(false);
  41 }
  42
  43 Effect *EffectChain::add_effect(EffectId effect_id)
  44 {
  45         Effect *effect = instantiate_effect(effect_id);
  46
  47         if (effect->needs_linear_light() && current_gamma_curve != GAMMA_LINEAR) {
  48                 GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
  49                 gamma_conversion->set_int("source_curve", current_gamma_curve);
  50                 effects.push_back(gamma_conversion);
  51                 current_gamma_curve = GAMMA_LINEAR;
  52         }
  53
  54         if (effect->needs_srgb_primaries() && current_color_space != COLORSPACE_sRGB) {
  55                 assert(current_gamma_curve == GAMMA_LINEAR);
  56                 ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
  57                 colorspace_conversion->set_int("source_space", current_color_space);
  58                 colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
  59                 effects.push_back(colorspace_conversion);
  60                 current_color_space = COLORSPACE_sRGB;
  61         }
  62
  63         // not handled yet
  64         assert(!effect->needs_many_samples());
  65         assert(!effect->needs_mipmaps());
  66
  67         effects.push_back(effect);
  68         return effect;
  69 }
  70
  71 void EffectChain::finalize()
  72 {
  73         std::string frag_shader = read_file("header.glsl");
  74
  75         for (unsigned i = 0; i < effects.size(); ++i) {
  76                 char effect_id[256];
  77                 sprintf(effect_id, "eff%d", i);
  78
  79                 frag_shader += "\n";
  80                 frag_shader += std::string("#define PREFIX(x) ") + effect_id + "_ ## x\n";
  81                 frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n";
  82                 frag_shader += effects[i]->output_glsl();
  83                 frag_shader += "#undef PREFIX\n";
  84                 frag_shader += "#undef FUNCNAME\n";
  85                 frag_shader += std::string("#define LAST_INPUT ") + effect_id + "\n";
  86                 frag_shader += "\n";
  87         }
  88         printf("%s\n", frag_shader.c_str());
  89
  90         glsl_program_num = glCreateProgram();
  91         GLhandleARB vs_obj = compile_shader(read_file("vs.glsl"), GL_VERTEX_SHADER);
  92         GLhandleARB fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
  93         glAttachObjectARB(glsl_program_num, vs_obj);
  94         check_error();
  95         glAttachObjectARB(glsl_program_num, fs_obj);
  96         check_error();
  97         glLinkProgram(glsl_program_num);
  98         check_error();
  99 }