X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=effect_chain.cpp;h=899c6a3f4ca9335e518cd3939a452cafe6955801;hp=a8381505109affe8ade2becd09009c58b15b1233;hb=75c27c449aabb27ed0b028b57b20d70005a6e447;hpb=f250ae0ffd74c401511e9db448b86c19f7720f02 diff --git a/effect_chain.cpp b/effect_chain.cpp index a838150..899c6a3 100644 --- a/effect_chain.cpp +++ b/effect_chain.cpp @@ -10,12 +10,16 @@ #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 "texture_enum.h" +#include "saturation_effect.h" +#include "mirror_effect.h" +#include "vignette_effect.h" +#include "blur_effect.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) { @@ -32,40 +36,61 @@ 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_COLOR_SPACE_CONVERSION: + return new ColorSpaceConversionEffect(); + case EFFECT_LIFT_GAMMA_GAIN: return new LiftGammaGainEffect(); + case EFFECT_SATURATION: + return new SaturationEffect(); + case EFFECT_MIRROR: + return new MirrorEffect(); + case EFFECT_VIGNETTE: + return new VignetteEffect(); + case EFFECT_BLUR: + return new BlurEffect(); } 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 - assert(!effect->needs_many_samples()); - assert(!effect->needs_mipmaps()); - effects.push_back(effect); return effect; } @@ -111,30 +136,32 @@ std::string replace_prefix(const std::string &text, const std::string &prefix) return output; } -void EffectChain::finalize() +EffectChain::Phase EffectChain::compile_glsl_program(unsigned start_index, unsigned end_index) { - std::string frag_shader = read_file("header.glsl"); - - for (unsigned i = 0; i < effects.size(); ++i) { + bool input_needs_mipmaps = false; + std::string frag_shader = read_file("header.frag"); + for (unsigned i = start_index; i < end_index; ++i) { char effect_id[256]; sprintf(effect_id, "eff%d", i); frag_shader += "\n"; frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n"; frag_shader += replace_prefix(effects[i]->output_convenience_uniforms(), effect_id); - frag_shader += replace_prefix(effects[i]->output_glsl(), effect_id); + frag_shader += replace_prefix(effects[i]->output_fragment_shader(), 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"; + + input_needs_mipmaps |= effects[i]->needs_mipmaps(); } - frag_shader.append(read_file("footer.glsl")); + frag_shader.append(read_file("footer.frag")); 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); + GLuint glsl_program_num = glCreateProgram(); + GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER); + GLuint fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER); glAttachShader(glsl_program_num, vs_obj); check_error(); glAttachShader(glsl_program_num, fs_obj); @@ -142,6 +169,111 @@ void EffectChain::finalize() glLinkProgram(glsl_program_num); check_error(); + Phase phase; + phase.glsl_program_num = glsl_program_num; + phase.input_needs_mipmaps = input_needs_mipmaps; + phase.start = start_index; + phase.end = end_index; + + return phase; +} + +void EffectChain::finalize() +{ + // Add normalizers to get the output format right. + 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; + } + + // Construct the GLSL programs. We end a program every time we come + // to an effect marked as "needs many samples" (ie. "please let me + // sample directly from a texture, with no arithmetic in-between"), + // and of course at the end. + unsigned start = 0; + for (unsigned i = 0; i < effects.size(); ++i) { + if (effects[i]->needs_many_samples() && i != start) { + phases.push_back(compile_glsl_program(start, i)); + start = i; + } + } + phases.push_back(compile_glsl_program(start, effects.size())); + + // If we have more than one phase, we need intermediate render-to-texture. + // Construct an FBO, and then as many textures as we need. + if (phases.size() > 1) { + glGenFramebuffers(1, &fbo); + + unsigned num_textures = std::max(phases.size() - 1, 2); + glGenTextures(num_textures, temp_textures); + + unsigned char *empty = new unsigned char[width * height * 4]; + for (unsigned i = 0; i < num_textures; ++i) { + glBindTexture(GL_TEXTURE_2D, temp_textures[i]); + check_error(); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, empty); + check_error(); + } + delete[] empty; + } + + // Translate the input format to OpenGL's enums. + GLenum internal_format; + if (use_srgb_texture_format) { + internal_format = GL_SRGB8; + } else { + internal_format = GL_RGBA8; + } + if (input_format.pixel_format == FORMAT_RGB) { + format = GL_RGB; + bytes_per_pixel = 3; + } else if (input_format.pixel_format == FORMAT_RGBA) { + format = GL_RGBA; + bytes_per_pixel = 4; + } else if (input_format.pixel_format == FORMAT_BGR) { + format = GL_BGR; + bytes_per_pixel = 3; + } else if (input_format.pixel_format == FORMAT_BGRA) { + format = GL_BGRA; + bytes_per_pixel = 4; + } else { + assert(false); + } + + // Create PBO to hold the texture holding the input image, and then the texture itself. + glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 2); + check_error(); + glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, width * height * bytes_per_pixel, NULL, GL_STREAM_DRAW); + check_error(); + + void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY); + memset(mapped_pbo, 0, width * height * bytes_per_pixel); + glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB); + + glGenTextures(1, &source_image_num); + check_error(); + glBindTexture(GL_TEXTURE_2D, source_image_num); + check_error(); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + check_error(); + glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0)); + check_error(); + glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0); + check_error(); + finalized = true; } @@ -149,28 +281,29 @@ void EffectChain::render_to_screen(unsigned char *src) { assert(finalized); + // Copy the pixel data into the PBO. + glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 2); check_error(); - glUseProgram(glsl_program_num); + void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY); + memcpy(mapped_pbo, src, width * height * bytes_per_pixel); + glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB); check_error(); + // Re-upload the texture from the PBO. glActiveTexture(GL_TEXTURE0); - glBindTexture(GL_TEXTURE_2D, SOURCE_IMAGE); - - // TODO: use sRGB textures if applicable - if (input_format.pixel_format == FORMAT_RGB) { - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, src); - } else if (input_format.pixel_format == FORMAT_RGBA) { - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 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) { - // effects[i]->set_uniforms(); - //} + glBindTexture(GL_TEXTURE_2D, source_image_num); + check_error(); + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0)); + check_error(); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + check_error(); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + check_error(); + glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0); + check_error(); + // Basic state. glDisable(GL_BLEND); check_error(); glDisable(GL_DEPTH_TEST); @@ -185,20 +318,81 @@ void EffectChain::render_to_screen(unsigned char *src) glMatrixMode(GL_MODELVIEW); glLoadIdentity(); - glBegin(GL_QUADS); + if (phases.size() > 1) { + glBindFramebuffer(GL_FRAMEBUFFER, fbo); + check_error(); + } + + for (unsigned phase = 0; phase < phases.size(); ++phase) { + // Set up inputs and outputs for this phase. + if (phase == 0) { + // First phase reads from the input texture (which is already bound). + } else { + glBindTexture(GL_TEXTURE_2D, temp_textures[(phase + 1) % 2]); + check_error(); + } + if (phases[phase].input_needs_mipmaps) { + glGenerateMipmap(GL_TEXTURE_2D); + check_error(); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + check_error(); + } else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + check_error(); + } + + if (phase == phases.size() - 1) { + // Last phase goes directly to the screen. + glBindFramebuffer(GL_FRAMEBUFFER, 0); + check_error(); + } else { + glFramebufferTexture2D( + GL_FRAMEBUFFER, + GL_COLOR_ATTACHMENT0, + GL_TEXTURE_2D, + temp_textures[phase % 2], + 0); + } + + // We have baked an upside-down transform into the quad coordinates, + // since the typical graphics program will have the origin at the upper-left, + // while OpenGL uses lower-left. In the next ones, however, the origin + // is all right, and we need to reverse that. + if (phase == 1) { + glTranslatef(0.0f, 1.0f, 0.0f); + glScalef(1.0f, -1.0f, 1.0f); + } - glTexCoord2f(0.0f, 1.0f); - glVertex2f(0.0f, 0.0f); + // Give the required parameters to all the effects. + glUseProgram(phases[phase].glsl_program_num); + check_error(); - glTexCoord2f(1.0f, 1.0f); - glVertex2f(1.0f, 0.0f); + glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, "input_tex"), 0); + check_error(); - glTexCoord2f(1.0f, 0.0f); - glVertex2f(1.0f, 1.0f); + unsigned sampler_num = 1; + for (unsigned i = phases[phase].start; i < phases[phase].end; ++i) { + char effect_id[256]; + sprintf(effect_id, "eff%d", i); + effects[i]->set_uniforms(phases[phase].glsl_program_num, effect_id, &sampler_num); + } - glTexCoord2f(0.0f, 0.0f); - glVertex2f(0.0f, 1.0f); + // Now draw! + glBegin(GL_QUADS); - glEnd(); - check_error(); + 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(); + } }