#include <GL/gl.h>
#include <GL/glext.h>
+#include <algorithm>
+#include <set>
+
#include "util.h"
#include "effect_chain.h"
#include "gamma_expansion_effect.h"
#include "mirror_effect.h"
#include "vignette_effect.h"
#include "blur_effect.h"
+#include "diffusion_effect.h"
EffectChain::EffectChain(unsigned width, unsigned height)
- : width(width), height(height), use_srgb_texture_format(false), finalized(false) {}
+ : width(width),
+ height(height),
+ last_added_effect(NULL),
+ use_srgb_texture_format(false),
+ finalized(false) {}
void EffectChain::add_input(const ImageFormat &format)
{
input_format = format;
- current_color_space = format.color_space;
- current_gamma_curve = format.gamma_curve;
+ output_color_space.insert(std::make_pair(static_cast<Effect *>(NULL), format.color_space));
+ output_gamma_curve.insert(std::make_pair(static_cast<Effect *>(NULL), format.gamma_curve));
+ effect_ids.insert(std::make_pair(static_cast<Effect *>(NULL), "src_image"));
}
void EffectChain::add_output(const ImageFormat &format)
{
output_format = format;
}
-
+
+void EffectChain::add_effect_raw(Effect *effect, const std::vector<Effect *> &inputs)
+{
+ char effect_id[256];
+ sprintf(effect_id, "eff%u", (unsigned)effects.size());
+
+ effects.push_back(effect);
+ effect_ids.insert(std::make_pair(effect, effect_id));
+ assert(inputs.size() == effect->num_inputs());
+ for (unsigned i = 0; i < inputs.size(); ++i) {
+ if (inputs[i] != NULL) {
+ assert(std::find(effects.begin(), effects.end(), inputs[i]) != effects.end());
+ }
+ outgoing_links[inputs[i]].push_back(effect);
+ }
+ incoming_links.insert(std::make_pair(effect, inputs));
+ last_added_effect = effect;
+}
+
Effect *instantiate_effect(EffectId effect)
{
switch (effect) {
return new VignetteEffect();
case EFFECT_BLUR:
return new BlurEffect();
+ case EFFECT_DIFFUSION:
+ return new DiffusionEffect();
}
assert(false);
}
-void EffectChain::normalize_to_linear_gamma()
+Effect *EffectChain::normalize_to_linear_gamma(Effect *input)
{
+ GammaCurve current_gamma_curve = output_gamma_curve[input];
if (current_gamma_curve == GAMMA_sRGB) {
// TODO: check if the extension exists
use_srgb_texture_format = true;
+ current_gamma_curve = GAMMA_LINEAR;
+ return input;
} else {
GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
gamma_conversion->set_int("source_curve", current_gamma_curve);
- gamma_conversion->add_self_to_effect_chain(&effects);
+ std::vector<Effect *> inputs;
+ inputs.push_back(input);
+ gamma_conversion->add_self_to_effect_chain(this, inputs);
+ current_gamma_curve = GAMMA_LINEAR;
+ return gamma_conversion;
}
- current_gamma_curve = GAMMA_LINEAR;
}
-void EffectChain::normalize_to_srgb()
+Effect *EffectChain::normalize_to_srgb(Effect *input)
{
+ GammaCurve current_gamma_curve = output_gamma_curve[input];
+ ColorSpace current_color_space = output_color_space[input];
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);
- colorspace_conversion->add_self_to_effect_chain(&effects);
+ std::vector<Effect *> inputs;
+ inputs.push_back(input);
+ colorspace_conversion->add_self_to_effect_chain(this, inputs);
current_color_space = COLORSPACE_sRGB;
+ return colorspace_conversion;
}
-Effect *EffectChain::add_effect(EffectId effect_id)
+Effect *EffectChain::add_effect(EffectId effect_id, const std::vector<Effect *> &inputs)
{
Effect *effect = instantiate_effect(effect_id);
- if (effect->needs_linear_light() && current_gamma_curve != GAMMA_LINEAR) {
- normalize_to_linear_gamma();
- }
+ assert(inputs.size() == effect->num_inputs());
- if (effect->needs_srgb_primaries() && current_color_space != COLORSPACE_sRGB) {
- normalize_to_srgb();
+ std::vector<Effect *> normalized_inputs = inputs;
+ for (unsigned i = 0; i < normalized_inputs.size(); ++i) {
+ if (effect->needs_linear_light() && output_gamma_curve[normalized_inputs[i]] != GAMMA_LINEAR) {
+ normalized_inputs[i] = normalize_to_linear_gamma(normalized_inputs[i]);
+ }
+ if (effect->needs_srgb_primaries() && output_color_space[normalized_inputs[i]] != COLORSPACE_sRGB) {
+ normalized_inputs[i] = normalize_to_srgb(normalized_inputs[i]);
+ }
}
- effect->add_self_to_effect_chain(&effects);
+ effect->add_self_to_effect_chain(this, normalized_inputs);
return effect;
}
return output;
}
-EffectChain::Phase EffectChain::compile_glsl_program(unsigned start_index, unsigned end_index)
+EffectChain::Phase EffectChain::compile_glsl_program(const std::vector<Effect *> &inputs, const std::vector<Effect *> &effects)
{
+ assert(!inputs.empty());
+ assert(!effects.empty());
+
+ // Figure out the true set of inputs to this phase. These are the ones
+ // that we need somehow but don't calculate ourselves.
+ std::set<Effect *> effect_set(effects.begin(), effects.end());
+ std::set<Effect *> input_set(inputs.begin(), inputs.end());
+ std::vector<Effect *> true_inputs;
+ std::set_difference(input_set.begin(), input_set.end(),
+ effect_set.begin(), effect_set.end(),
+ std::back_inserter(true_inputs));
+
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);
+
+ // Create functions for all the texture inputs that we need.
+ for (unsigned i = 0; i < true_inputs.size(); ++i) {
+ Effect *effect = true_inputs[i];
+ assert(effect_ids.count(effect) != 0);
+ std::string effect_id = effect_ids[effect];
+
+ frag_shader += std::string("uniform sampler2D tex_") + effect_id + ";\n";
+ frag_shader += std::string("vec4 ") + effect_id + "(vec2 tc) {\n";
+ if (effect == NULL) {
+ // OpenGL's origin is bottom-left, but most graphics software assumes
+ // a top-left origin. Thus, for inputs that come from the user,
+ // we flip the y coordinate. However, for FBOs, the origin
+ // is all correct, so don't do anything.
+ frag_shader += "\ttc.y = 1.0f - tc.y;\n";
+ }
+ frag_shader += "\treturn texture2D(tex_" + effect_id + ", tc);\n";
+ frag_shader += "}\n";
+ frag_shader += "\n";
+ }
+
+ std::string last_effect_id;
+ for (unsigned i = 0; i < effects.size(); ++i) {
+ Effect *effect = effects[i];
+ assert(effect != NULL);
+ assert(effect_ids.count(effect) != 0);
+ std::string effect_id = effect_ids[effect];
+ last_effect_id = effect_id;
+
+ if (incoming_links[effect].size() == 1) {
+ frag_shader += std::string("#define INPUT ") + effect_ids[incoming_links[effect][0]] + "\n";
+ } else {
+ for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
+ char buf[256];
+ sprintf(buf, "#define INPUT%d %s\n", j + 1, effect_ids[incoming_links[effect][j]].c_str());
+ frag_shader += buf;
+ }
+ }
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_fragment_shader(), effect_id);
+ frag_shader += replace_prefix(effect->output_convenience_uniforms(), effect_id);
+ frag_shader += replace_prefix(effect->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";
+ if (incoming_links[effect].size() == 1) {
+ frag_shader += "#undef INPUT\n";
+ } else {
+ for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
+ char buf[256];
+ sprintf(buf, "#undef INPUT%d\n", j + 1);
+ frag_shader += buf;
+ }
+ }
frag_shader += "\n";
- input_needs_mipmaps |= effects[i]->needs_mipmaps();
+ input_needs_mipmaps |= effect->needs_mipmaps();
}
+ assert(!last_effect_id.empty());
+ frag_shader += std::string("#define INPUT ") + last_effect_id + "\n";
frag_shader.append(read_file("footer.frag"));
printf("%s\n", frag_shader.c_str());
Phase phase;
phase.glsl_program_num = glsl_program_num;
phase.input_needs_mipmaps = input_needs_mipmaps;
- phase.start = start_index;
- phase.end = end_index;
+ phase.inputs = true_inputs;
+ phase.effects = effects;
return phase;
}
+// Construct GLSL programs, starting at the given effect and following
+// the chain from there. We end a program every time we come to an effect
+// marked as "needs texture bounce", one that is used by multiple other
+// effects, and of course at the end.
+void EffectChain::construct_glsl_programs(Effect *start, std::set<Effect *> *completed_effects)
+{
+ if (completed_effects->count(start) != 0) {
+ // This has already been done for us.
+ return;
+ }
+
+ std::vector<Effect *> this_phase_inputs; // Also includes all intermediates; these will be filtered away later.
+ std::vector<Effect *> this_phase_effects;
+ Effect *node = start;
+ for ( ;; ) { // Termination condition within loop.
+ if (node == NULL) {
+ this_phase_inputs.push_back(node);
+ } else {
+ // Check that we have all the inputs we need for this effect.
+ // If not, we end the phase here right away; the other side
+ // of the input chain will eventually come and pick the effect up.
+ assert(incoming_links.count(node) != 0);
+ std::vector<Effect *> deps = incoming_links[node];
+ assert(!deps.empty());
+ bool have_all_deps = true;
+ for (unsigned i = 0; i < deps.size(); ++i) {
+ if (completed_effects->count(deps[i]) == 0) {
+ have_all_deps = false;
+ break;
+ }
+ }
+
+ if (!have_all_deps) {
+ if (!this_phase_effects.empty()) {
+ phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
+ }
+ return;
+ }
+ this_phase_inputs.insert(this_phase_inputs.end(), deps.begin(), deps.end());
+ this_phase_effects.push_back(node);
+ }
+ completed_effects->insert(node);
+
+ // Find all the effects that use this one as a direct input.
+ if (outgoing_links.count(node) == 0) {
+ // End of the line; output.
+ phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
+ return;
+ }
+
+ std::vector<Effect *> next = outgoing_links[node];
+ assert(!next.empty());
+ if (next.size() > 1) {
+ // More than one effect uses this as the input.
+ // The easiest thing to do (and probably also the safest
+ // performance-wise in most cases) is to bounce it to a texture
+ // and then let the next passes read from that.
+ if (node != NULL) {
+ phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
+ }
+
+ // Start phases for all the effects that need us (in arbitrary order).
+ for (unsigned i = 0; i < next.size(); ++i) {
+ construct_glsl_programs(next[i], completed_effects);
+ }
+ return;
+ }
+
+ // OK, only one effect uses this as the input. Keep iterating,
+ // but first see if it requires a texture bounce; if so, give it
+ // one by starting a new phase.
+ node = next[0];
+ if (node->needs_texture_bounce()) {
+ phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
+ this_phase_inputs.clear();
+ this_phase_effects.clear();
+ }
+ }
+}
+
void EffectChain::finalize()
{
// Add normalizers to get the output format right.
+ GammaCurve current_gamma_curve = output_gamma_curve[last_added_effect]; // FIXME
+ ColorSpace current_color_space = output_color_space[last_added_effect]; // FIXME
if (current_color_space != output_format.color_space) {
ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
colorspace_conversion->set_int("source_space", current_color_space);
}
if (current_gamma_curve != output_format.gamma_curve) {
if (current_gamma_curve != GAMMA_LINEAR) {
- normalize_to_linear_gamma();
+ normalize_to_linear_gamma(last_added_effect); // FIXME
}
assert(current_gamma_curve == GAMMA_LINEAR);
GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
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()));
+ // Construct all needed GLSL programs, starting at the input.
+ std::set<Effect *> completed_effects;
+ construct_glsl_programs(NULL, &completed_effects);
// If we have more than one phase, we need intermediate render-to-texture.
// Construct an FBO, and then as many textures as we need.
+ // We choose the simplest option of having one texture per output,
+ // since otherwise this turns into an (albeit simple)
+ // register allocation problem.
if (phases.size() > 1) {
glGenFramebuffers(1, &fbo);
- unsigned num_textures = std::max<int>(phases.size() - 1, 2);
- glGenTextures(num_textures, temp_textures);
-
- for (unsigned i = 0; i < num_textures; ++i) {
- glBindTexture(GL_TEXTURE_2D, temp_textures[i]);
+ for (unsigned i = 0; i < phases.size() - 1; ++i) {
+ Effect *output_effect = phases[i].effects.back();
+ GLuint temp_texture;
+ glGenTextures(1, &temp_texture);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, temp_texture);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
check_error();
check_error();
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
check_error();
+ effect_output_textures.insert(std::make_pair(output_effect, temp_texture));
}
}
check_error();
}
+ std::set<Effect *> generated_mipmaps;
+ generated_mipmaps.insert(NULL); // Already done further up.
+
for (unsigned phase = 0; phase < phases.size(); ++phase) {
- // Set up inputs and outputs for this phase.
- glActiveTexture(GL_TEXTURE0);
- 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) {
- if (phase != 0) {
- // For phase 0, it's done further up.
- glGenerateMipmap(GL_TEXTURE_2D);
+ glUseProgram(phases[phase].glsl_program_num);
+ check_error();
+
+ // Set up inputs for this phase.
+ assert(!phases[phase].inputs.empty());
+ for (unsigned sampler = 0; sampler < phases[phase].inputs.size(); ++sampler) {
+ glActiveTexture(GL_TEXTURE0 + sampler);
+ Effect *input = phases[phase].inputs[sampler];
+ if (input == NULL) {
+ glBindTexture(GL_TEXTURE_2D, source_image_num);
+ check_error();
+ } else {
+ assert(effect_output_textures.count(input) != 0);
+ glBindTexture(GL_TEXTURE_2D, effect_output_textures[input]);
check_error();
}
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
- check_error();
- } else {
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ if (phases[phase].input_needs_mipmaps) {
+ if (generated_mipmaps.count(input) == 0) {
+ glGenerateMipmap(GL_TEXTURE_2D);
+ check_error();
+ generated_mipmaps.insert(input);
+ }
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+ check_error();
+ } else {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+ }
+
+ assert(effect_ids.count(input));
+ std::string texture_name = std::string("tex_") + effect_ids[input];
+ glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, texture_name.c_str()), sampler);
check_error();
}
+ // And now the output.
if (phase == phases.size() - 1) {
// Last phase goes directly to the screen.
glBindFramebuffer(GL_FRAMEBUFFER, 0);
check_error();
} else {
+ Effect *last_effect = phases[phase].effects.back();
+ assert(effect_output_textures.count(last_effect) != 0);
glFramebufferTexture2D(
GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
- temp_textures[phase % 2],
+ effect_output_textures[last_effect],
0);
check_error();
}
- // 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);
- }
-
// Give the required parameters to all the effects.
- glUseProgram(phases[phase].glsl_program_num);
- check_error();
-
- glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, "input_tex"), 0);
- check_error();
-
- 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);
+ unsigned sampler_num = phases[phase].inputs.size();
+ for (unsigned i = 0; i < phases[phase].effects.size(); ++i) {
+ Effect *effect = phases[phase].effects[i];
+ effect->set_uniforms(phases[phase].glsl_program_num, effect_ids[effect], &sampler_num);
}
// Now draw!
glBegin(GL_QUADS);
- glTexCoord2f(0.0f, 1.0f);
+ glTexCoord2f(0.0f, 0.0f);
glVertex2f(0.0f, 0.0f);
- glTexCoord2f(1.0f, 1.0f);
+ glTexCoord2f(1.0f, 0.0f);
glVertex2f(1.0f, 0.0f);
- glTexCoord2f(1.0f, 0.0f);
+ glTexCoord2f(1.0f, 1.0f);
glVertex2f(1.0f, 1.0f);
- glTexCoord2f(0.0f, 0.0f);
+ glTexCoord2f(0.0f, 1.0f);
glVertex2f(0.0f, 1.0f);
glEnd();
projects / movit / blobdiff