Add color space conversions on input and output.
[movit] / effect_chain.cpp
index 50fe599..5d9eaa3 100644 (file)
 #include "util.h"
 #include "effect_chain.h"
 #include "gamma_expansion_effect.h"
+#include "gamma_compression_effect.h"
 #include "lift_gamma_gain_effect.h"
 #include "colorspace_conversion_effect.h"
+#include "saturation_effect.h"
+#include "texture_enum.h"
 
 EffectChain::EffectChain(unsigned width, unsigned height)
-       : width(width), height(height), finalized(false) {}
+       : width(width), height(height), use_srgb_texture_format(false), finalized(false) {}
 
 void EffectChain::add_input(const ImageFormat &format)
 {
@@ -31,34 +34,51 @@ void EffectChain::add_output(const ImageFormat &format)
 Effect *instantiate_effect(EffectId effect)
 {
        switch (effect) {
-       case GAMMA_CONVERSION:
+       case EFFECT_GAMMA_EXPANSION:
                return new GammaExpansionEffect();
-       case RGB_PRIMARIES_CONVERSION:
-               return new GammaExpansionEffect();
-       case LIFT_GAMMA_GAIN:
+       case EFFECT_GAMMA_COMPRESSION:
+               return new GammaCompressionEffect();
+       case EFFECT_LIFT_GAMMA_GAIN:
                return new LiftGammaGainEffect();
+       case EFFECT_SATURATION:
+               return new SaturationEffect();
        }
        assert(false);
 }
 
+void EffectChain::normalize_to_linear_gamma()
+{
+       if (current_gamma_curve == GAMMA_sRGB) {
+               // TODO: check if the extension exists
+               use_srgb_texture_format = true;
+       } else {
+               GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
+               gamma_conversion->set_int("source_curve", current_gamma_curve);
+               effects.push_back(gamma_conversion);
+       }
+       current_gamma_curve = GAMMA_LINEAR;
+}
+
+void EffectChain::normalize_to_srgb()
+{
+       assert(current_gamma_curve == GAMMA_LINEAR);
+       ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
+       colorspace_conversion->set_int("source_space", current_color_space);
+       colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
+       effects.push_back(colorspace_conversion);
+       current_color_space = COLORSPACE_sRGB;
+}
+
 Effect *EffectChain::add_effect(EffectId effect_id)
 {
        Effect *effect = instantiate_effect(effect_id);
 
        if (effect->needs_linear_light() && current_gamma_curve != GAMMA_LINEAR) {
-               GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
-               gamma_conversion->set_int("source_curve", current_gamma_curve);
-               effects.push_back(gamma_conversion);
-               current_gamma_curve = GAMMA_LINEAR;
+               normalize_to_linear_gamma();
        }
 
        if (effect->needs_srgb_primaries() && current_color_space != COLORSPACE_sRGB) {
-               assert(current_gamma_curve == GAMMA_LINEAR);
-               ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
-               colorspace_conversion->set_int("source_space", current_color_space);
-               colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
-               effects.push_back(colorspace_conversion);
-               current_color_space = COLORSPACE_sRGB;
+               normalize_to_srgb();
        }
 
        // not handled yet
@@ -112,6 +132,25 @@ std::string replace_prefix(const std::string &text, const std::string &prefix)
 
 void EffectChain::finalize()
 {
+       if (current_color_space != output_format.color_space) {
+               ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
+               colorspace_conversion->set_int("source_space", current_color_space);
+               colorspace_conversion->set_int("destination_space", output_format.color_space);
+               effects.push_back(colorspace_conversion);
+               current_color_space = output_format.color_space;
+       }
+
+       if (current_gamma_curve != output_format.gamma_curve) {
+               if (current_gamma_curve != GAMMA_LINEAR) {
+                       normalize_to_linear_gamma();
+               }
+               assert(current_gamma_curve == GAMMA_LINEAR);
+               GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
+               gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
+               effects.push_back(gamma_conversion);
+               current_gamma_curve = output_format.gamma_curve;
+       }
+
        std::string frag_shader = read_file("header.glsl");
 
        for (unsigned i = 0; i < effects.size(); ++i) {
@@ -124,18 +163,86 @@ void EffectChain::finalize()
                frag_shader += replace_prefix(effects[i]->output_glsl(), effect_id);
                frag_shader += "#undef PREFIX\n";
                frag_shader += "#undef FUNCNAME\n";
+               frag_shader += "#undef LAST_INPUT\n";
                frag_shader += std::string("#define LAST_INPUT ") + effect_id + "\n";
                frag_shader += "\n";
        }
+       frag_shader.append(read_file("footer.glsl"));
        printf("%s\n", frag_shader.c_str());
        
        glsl_program_num = glCreateProgram();
        GLhandleARB vs_obj = compile_shader(read_file("vs.glsl"), GL_VERTEX_SHADER);
        GLhandleARB fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
-       glAttachObjectARB(glsl_program_num, vs_obj);
+       glAttachShader(glsl_program_num, vs_obj);
        check_error();
-       glAttachObjectARB(glsl_program_num, fs_obj);
+       glAttachShader(glsl_program_num, fs_obj);
        check_error();
        glLinkProgram(glsl_program_num);
        check_error();
+
+       finalized = true;
+}
+
+void EffectChain::render_to_screen(unsigned char *src)
+{
+       assert(finalized);
+
+       check_error();
+       glUseProgram(glsl_program_num);
+       check_error();
+
+       glActiveTexture(GL_TEXTURE0);
+       glBindTexture(GL_TEXTURE_2D, SOURCE_IMAGE);
+
+       GLenum internal_format = GL_RGBA8;
+       if (use_srgb_texture_format) {
+               internal_format = GL_SRGB8;
+       }
+
+       if (input_format.pixel_format == FORMAT_RGB) {
+               glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, src);
+       } else if (input_format.pixel_format == FORMAT_RGBA) {
+               glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, src);
+       } else {
+               assert(false);
+       }
+       check_error();
+       glUniform1i(glGetUniformLocation(glsl_program_num, "input_tex"), 0);
+
+       for (unsigned i = 0; i < effects.size(); ++i) {
+               char effect_id[256];
+               sprintf(effect_id, "eff%d", i);
+               effects[i]->set_uniforms(glsl_program_num, effect_id);
+       }
+
+       glDisable(GL_BLEND);
+       check_error();
+       glDisable(GL_DEPTH_TEST);
+       check_error();
+       glDepthMask(GL_FALSE);
+       check_error();
+
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+       glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
+
+       glMatrixMode(GL_MODELVIEW);
+       glLoadIdentity();
+
+       glBegin(GL_QUADS);
+
+       glTexCoord2f(0.0f, 1.0f);
+       glVertex2f(0.0f, 0.0f);
+
+       glTexCoord2f(1.0f, 1.0f);
+       glVertex2f(1.0f, 0.0f);
+
+       glTexCoord2f(1.0f, 0.0f);
+       glVertex2f(1.0f, 1.0f);
+
+       glTexCoord2f(0.0f, 0.0f);
+       glVertex2f(0.0f, 1.0f);
+
+       glEnd();
+       check_error();
 }