+void EffectChain::find_color_spaces_for_inputs()
+{
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ if (node->incoming_links.size() == 0) {
+ Input *input = static_cast<Input *>(node->effect);
+ node->output_color_space = input->get_color_space();
+ node->output_gamma_curve = input->get_gamma_curve();
+
+ Effect::AlphaHandling alpha_handling = input->alpha_handling();
+ switch (alpha_handling) {
+ case Effect::OUTPUT_BLANK_ALPHA:
+ node->output_alpha_type = ALPHA_BLANK;
+ break;
+ case Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA:
+ node->output_alpha_type = ALPHA_PREMULTIPLIED;
+ break;
+ case Effect::OUTPUT_POSTMULTIPLIED_ALPHA:
+ node->output_alpha_type = ALPHA_POSTMULTIPLIED;
+ break;
+ case Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK:
+ case Effect::DONT_CARE_ALPHA_TYPE:
+ default:
+ assert(false);
+ }
+
+ if (node->output_alpha_type == ALPHA_PREMULTIPLIED) {
+ assert(node->output_gamma_curve == GAMMA_LINEAR);
+ }
+ }
+ }
+}
+
+// Propagate gamma and color space information as far as we can in the graph.
+// The rules are simple: Anything where all the inputs agree, get that as
+// output as well. Anything else keeps having *_INVALID.
+void EffectChain::propagate_gamma_and_color_space()
+{
+ // We depend on going through the nodes in order.
+ sort_all_nodes_topologically();
+
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ assert(node->incoming_links.size() == node->effect->num_inputs());
+ if (node->incoming_links.size() == 0) {
+ assert(node->output_color_space != COLORSPACE_INVALID);
+ assert(node->output_gamma_curve != GAMMA_INVALID);
+ continue;
+ }
+
+ Colorspace color_space = node->incoming_links[0]->output_color_space;
+ GammaCurve gamma_curve = node->incoming_links[0]->output_gamma_curve;
+ for (unsigned j = 1; j < node->incoming_links.size(); ++j) {
+ if (node->incoming_links[j]->output_color_space != color_space) {
+ color_space = COLORSPACE_INVALID;
+ }
+ if (node->incoming_links[j]->output_gamma_curve != gamma_curve) {
+ gamma_curve = GAMMA_INVALID;
+ }
+ }
+
+ // The conversion effects already have their outputs set correctly,
+ // so leave them alone.
+ if (node->effect->effect_type_id() != "ColorspaceConversionEffect") {
+ node->output_color_space = color_space;
+ }
+ if (node->effect->effect_type_id() != "GammaCompressionEffect" &&
+ node->effect->effect_type_id() != "GammaExpansionEffect") {
+ node->output_gamma_curve = gamma_curve;
+ }
+ }
+}
+
+// Propagate alpha information as far as we can in the graph.
+// Similar to propagate_gamma_and_color_space().
+void EffectChain::propagate_alpha()
+{
+ // We depend on going through the nodes in order.
+ sort_all_nodes_topologically();
+
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ assert(node->incoming_links.size() == node->effect->num_inputs());
+ if (node->incoming_links.size() == 0) {
+ assert(node->output_alpha_type != ALPHA_INVALID);
+ continue;
+ }
+
+ // The alpha multiplication/division effects are special cases.
+ if (node->effect->effect_type_id() == "AlphaMultiplicationEffect") {
+ assert(node->incoming_links.size() == 1);
+ assert(node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED);
+ node->output_alpha_type = ALPHA_PREMULTIPLIED;
+ continue;
+ }
+ if (node->effect->effect_type_id() == "AlphaDivisionEffect") {
+ assert(node->incoming_links.size() == 1);
+ assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
+ node->output_alpha_type = ALPHA_POSTMULTIPLIED;
+ continue;
+ }
+
+ // GammaCompressionEffect and GammaExpansionEffect are also a special case,
+ // because they are the only one that _need_ postmultiplied alpha.
+ if (node->effect->effect_type_id() == "GammaCompressionEffect" ||
+ node->effect->effect_type_id() == "GammaExpansionEffect") {
+ assert(node->incoming_links.size() == 1);
+ if (node->incoming_links[0]->output_alpha_type == ALPHA_BLANK) {
+ node->output_alpha_type = ALPHA_BLANK;
+ } else if (node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED) {
+ node->output_alpha_type = ALPHA_POSTMULTIPLIED;
+ } else {
+ node->output_alpha_type = ALPHA_INVALID;
+ }
+ continue;
+ }
+
+ // Only inputs can have unconditional alpha output (OUTPUT_BLANK_ALPHA
+ // or OUTPUT_POSTMULTIPLIED_ALPHA), and they have already been
+ // taken care of above. Rationale: Even if you could imagine
+ // e.g. an effect that took in an image and set alpha=1.0
+ // unconditionally, it wouldn't make any sense to have it as
+ // e.g. OUTPUT_BLANK_ALPHA, since it wouldn't know whether it
+ // got its input pre- or postmultiplied, so it wouldn't know
+ // whether to divide away the old alpha or not.
+ Effect::AlphaHandling alpha_handling = node->effect->alpha_handling();
+ assert(alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
+ alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK ||
+ alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
+
+ // If the node has multiple inputs, check that they are all valid and
+ // the same.
+ bool any_invalid = false;
+ bool any_premultiplied = false;
+ bool any_postmultiplied = false;
+
+ for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
+ switch (node->incoming_links[j]->output_alpha_type) {
+ case ALPHA_INVALID:
+ any_invalid = true;
+ break;
+ case ALPHA_BLANK:
+ // Blank is good as both pre- and postmultiplied alpha,
+ // so just ignore it.
+ break;
+ case ALPHA_PREMULTIPLIED:
+ any_premultiplied = true;
+ break;
+ case ALPHA_POSTMULTIPLIED:
+ any_postmultiplied = true;
+ break;
+ default:
+ assert(false);
+ }
+ }
+
+ if (any_invalid) {
+ node->output_alpha_type = ALPHA_INVALID;
+ continue;
+ }
+
+ // Inputs must be of the same type.
+ if (any_premultiplied && any_postmultiplied) {
+ node->output_alpha_type = ALPHA_INVALID;
+ continue;
+ }
+
+ if (alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
+ alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
+ // If the effect has asked for premultiplied alpha, check that it has got it.
+ if (any_postmultiplied) {
+ node->output_alpha_type = ALPHA_INVALID;
+ } else if (!any_premultiplied &&
+ alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
+ // Blank input alpha, and the effect preserves blank alpha.
+ node->output_alpha_type = ALPHA_BLANK;
+ } else {
+ node->output_alpha_type = ALPHA_PREMULTIPLIED;
+ }
+ } else {
+ // OK, all inputs are the same, and this effect is not going
+ // to change it.
+ assert(alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
+ if (any_premultiplied) {
+ node->output_alpha_type = ALPHA_PREMULTIPLIED;
+ } else if (any_postmultiplied) {
+ node->output_alpha_type = ALPHA_POSTMULTIPLIED;
+ } else {
+ node->output_alpha_type = ALPHA_BLANK;
+ }
+ }
+ }
+}
+
+bool EffectChain::node_needs_colorspace_fix(Node *node)
+{
+ if (node->disabled) {
+ return false;
+ }
+ if (node->effect->num_inputs() == 0) {
+ return false;
+ }
+
+ // propagate_gamma_and_color_space() has already set our output
+ // to COLORSPACE_INVALID if the inputs differ, so we can rely on that.
+ if (node->output_color_space == COLORSPACE_INVALID) {
+ return true;
+ }
+ return (node->effect->needs_srgb_primaries() && node->output_color_space != COLORSPACE_sRGB);
+}
+
+// Fix up color spaces so that there are no COLORSPACE_INVALID nodes left in
+// the graph. Our strategy is not always optimal, but quite simple:
+// Find an effect that's as early as possible where the inputs are of
+// unacceptable colorspaces (that is, either different, or, if the effect only
+// wants sRGB, not sRGB.) Add appropriate conversions on all its inputs,
+// propagate the information anew, and repeat until there are no more such
+// effects.
+void EffectChain::fix_internal_color_spaces()
+{
+ unsigned colorspace_propagation_pass = 0;
+ bool found_any;
+ do {
+ found_any = false;
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (!node_needs_colorspace_fix(node)) {
+ continue;
+ }
+
+ // Go through each input that is not sRGB, and insert
+ // a colorspace conversion after it.
+ for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
+ Node *input = node->incoming_links[j];
+ assert(input->output_color_space != COLORSPACE_INVALID);
+ if (input->output_color_space == COLORSPACE_sRGB) {
+ continue;
+ }
+ Node *conversion = add_node(new ColorspaceConversionEffect());
+ CHECK(conversion->effect->set_int("source_space", input->output_color_space));
+ CHECK(conversion->effect->set_int("destination_space", COLORSPACE_sRGB));
+ conversion->output_color_space = COLORSPACE_sRGB;
+ replace_sender(input, conversion);
+ connect_nodes(input, conversion);
+ }
+
+ // Re-sort topologically, and propagate the new information.
+ propagate_gamma_and_color_space();
+
+ found_any = true;
+ break;
+ }
+
+ char filename[256];
+ sprintf(filename, "step5-colorspacefix-iter%u.dot", ++colorspace_propagation_pass);
+ output_dot(filename);
+ assert(colorspace_propagation_pass < 100);
+ } while (found_any);
+
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ assert(node->output_color_space != COLORSPACE_INVALID);
+ }
+}
+
+bool EffectChain::node_needs_alpha_fix(Node *node)
+{
+ if (node->disabled) {
+ return false;
+ }
+
+ // propagate_alpha() has already set our output to ALPHA_INVALID if the
+ // inputs differ or we are otherwise in mismatch, so we can rely on that.
+ return (node->output_alpha_type == ALPHA_INVALID);
+}
+
+// Fix up alpha so that there are no ALPHA_INVALID nodes left in
+// the graph. Similar to fix_internal_color_spaces().
+void EffectChain::fix_internal_alpha(unsigned step)
+{
+ unsigned alpha_propagation_pass = 0;
+ bool found_any;
+ do {
+ found_any = false;
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (!node_needs_alpha_fix(node)) {
+ continue;
+ }
+
+ // If we need to fix up GammaExpansionEffect, then clearly something
+ // is wrong, since the combination of premultiplied alpha and nonlinear inputs
+ // is meaningless.
+ assert(node->effect->effect_type_id() != "GammaExpansionEffect");
+
+ AlphaType desired_type = ALPHA_PREMULTIPLIED;
+
+ // GammaCompressionEffect is special; it needs postmultiplied alpha.
+ if (node->effect->effect_type_id() == "GammaCompressionEffect") {
+ assert(node->incoming_links.size() == 1);
+ assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
+ desired_type = ALPHA_POSTMULTIPLIED;
+ }
+
+ // Go through each input that is not premultiplied alpha, and insert
+ // a conversion before it.
+ for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
+ Node *input = node->incoming_links[j];
+ assert(input->output_alpha_type != ALPHA_INVALID);
+ if (input->output_alpha_type == desired_type ||
+ input->output_alpha_type == ALPHA_BLANK) {
+ continue;
+ }
+ Node *conversion;
+ if (desired_type == ALPHA_PREMULTIPLIED) {
+ conversion = add_node(new AlphaMultiplicationEffect());
+ } else {
+ conversion = add_node(new AlphaDivisionEffect());
+ }
+ conversion->output_alpha_type = desired_type;
+ replace_sender(input, conversion);
+ connect_nodes(input, conversion);
+ }
+
+ // Re-sort topologically, and propagate the new information.
+ propagate_gamma_and_color_space();
+ propagate_alpha();
+
+ found_any = true;
+ break;
+ }
+
+ char filename[256];
+ sprintf(filename, "step%u-alphafix-iter%u.dot", step, ++alpha_propagation_pass);
+ output_dot(filename);
+ assert(alpha_propagation_pass < 100);
+ } while (found_any);
+
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ assert(node->output_alpha_type != ALPHA_INVALID);
+ }
+}
+
+// Make so that the output is in the desired color space.
+void EffectChain::fix_output_color_space()
+{
+ Node *output = find_output_node();
+ if (output->output_color_space != output_format.color_space) {
+ Node *conversion = add_node(new ColorspaceConversionEffect());
+ CHECK(conversion->effect->set_int("source_space", output->output_color_space));
+ CHECK(conversion->effect->set_int("destination_space", output_format.color_space));
+ conversion->output_color_space = output_format.color_space;
+ connect_nodes(output, conversion);
+ propagate_alpha();
+ propagate_gamma_and_color_space();
+ }
+}
+
+// Make so that the output is in the desired pre-/postmultiplication alpha state.
+void EffectChain::fix_output_alpha()
+{
+ Node *output = find_output_node();
+ assert(output->output_alpha_type != ALPHA_INVALID);
+ if (output->output_alpha_type == ALPHA_BLANK) {
+ // No alpha output, so we don't care.
+ return;
+ }
+ if (output->output_alpha_type == ALPHA_PREMULTIPLIED &&
+ output_alpha_format == OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED) {
+ Node *conversion = add_node(new AlphaDivisionEffect());
+ connect_nodes(output, conversion);
+ propagate_alpha();
+ propagate_gamma_and_color_space();
+ }
+ if (output->output_alpha_type == ALPHA_POSTMULTIPLIED &&
+ output_alpha_format == OUTPUT_ALPHA_FORMAT_PREMULTIPLIED) {
+ Node *conversion = add_node(new AlphaMultiplicationEffect());
+ connect_nodes(output, conversion);
+ propagate_alpha();
+ propagate_gamma_and_color_space();
+ }
+}
+
+bool EffectChain::node_needs_gamma_fix(Node *node)
+{
+ if (node->disabled) {
+ return false;
+ }
+
+ // Small hack since the output is not an explicit node:
+ // If we are the last node and our output is in the wrong
+ // space compared to EffectChain's output, we need to fix it.
+ // This will only take us to linear, but fix_output_gamma()
+ // will come and take us to the desired output gamma
+ // if it is needed.
+ //
+ // This needs to be before everything else, since it could
+ // even apply to inputs (if they are the only effect).
+ if (node->outgoing_links.empty() &&
+ node->output_gamma_curve != output_format.gamma_curve &&
+ node->output_gamma_curve != GAMMA_LINEAR) {
+ return true;
+ }
+
+ if (node->effect->num_inputs() == 0) {
+ return false;
+ }
+
+ // propagate_gamma_and_color_space() has already set our output
+ // to GAMMA_INVALID if the inputs differ, so we can rely on that,
+ // except for GammaCompressionEffect.
+ if (node->output_gamma_curve == GAMMA_INVALID) {
+ return true;
+ }
+ if (node->effect->effect_type_id() == "GammaCompressionEffect") {
+ assert(node->incoming_links.size() == 1);
+ return node->incoming_links[0]->output_gamma_curve != GAMMA_LINEAR;
+ }
+
+ return (node->effect->needs_linear_light() && node->output_gamma_curve != GAMMA_LINEAR);
+}
+
+// Very similar to fix_internal_color_spaces(), but for gamma.
+// There is one difference, though; before we start adding conversion nodes,
+// we see if we can get anything out of asking the sources to deliver
+// linear gamma directly. fix_internal_gamma_by_asking_inputs()
+// does that part, while fix_internal_gamma_by_inserting_nodes()
+// inserts nodes as needed afterwards.
+void EffectChain::fix_internal_gamma_by_asking_inputs(unsigned step)
+{
+ unsigned gamma_propagation_pass = 0;
+ bool found_any;
+ do {
+ found_any = false;
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (!node_needs_gamma_fix(node)) {
+ continue;
+ }
+
+ // See if all inputs can give us linear gamma. If not, leave it.
+ std::vector<Node *> nonlinear_inputs;
+ find_all_nonlinear_inputs(node, &nonlinear_inputs);
+ assert(!nonlinear_inputs.empty());
+
+ bool all_ok = true;
+ for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
+ Input *input = static_cast<Input *>(nonlinear_inputs[i]->effect);
+ all_ok &= input->can_output_linear_gamma();
+ }
+
+ if (!all_ok) {
+ continue;
+ }
+
+ for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
+ CHECK(nonlinear_inputs[i]->effect->set_int("output_linear_gamma", 1));
+ nonlinear_inputs[i]->output_gamma_curve = GAMMA_LINEAR;
+ }
+
+ // Re-sort topologically, and propagate the new information.
+ propagate_gamma_and_color_space();
+
+ found_any = true;
+ break;
+ }
+
+ char filename[256];
+ sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
+ output_dot(filename);
+ assert(gamma_propagation_pass < 100);
+ } while (found_any);
+}
+
+void EffectChain::fix_internal_gamma_by_inserting_nodes(unsigned step)
+{
+ unsigned gamma_propagation_pass = 0;
+ bool found_any;
+ do {
+ found_any = false;
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (!node_needs_gamma_fix(node)) {
+ continue;
+ }
+
+ // Special case: We could be an input and still be asked to
+ // fix our gamma; if so, we should be the only node
+ // (as node_needs_gamma_fix() would only return true in
+ // for an input in that case). That means we should insert
+ // a conversion node _after_ ourselves.
+ if (node->incoming_links.empty()) {
+ assert(node->outgoing_links.empty());
+ Node *conversion = add_node(new GammaExpansionEffect());
+ CHECK(conversion->effect->set_int("source_curve", node->output_gamma_curve));
+ conversion->output_gamma_curve = GAMMA_LINEAR;
+ connect_nodes(node, conversion);
+ }
+
+ // If not, go through each input that is not linear gamma,
+ // and insert a gamma conversion after it.
+ for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
+ Node *input = node->incoming_links[j];
+ assert(input->output_gamma_curve != GAMMA_INVALID);
+ if (input->output_gamma_curve == GAMMA_LINEAR) {
+ continue;
+ }
+ Node *conversion = add_node(new GammaExpansionEffect());
+ CHECK(conversion->effect->set_int("source_curve", input->output_gamma_curve));
+ conversion->output_gamma_curve = GAMMA_LINEAR;
+ replace_sender(input, conversion);
+ connect_nodes(input, conversion);
+ }
+
+ // Re-sort topologically, and propagate the new information.
+ propagate_alpha();
+ propagate_gamma_and_color_space();
+
+ found_any = true;
+ break;
+ }
+
+ char filename[256];
+ sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
+ output_dot(filename);
+ assert(gamma_propagation_pass < 100);
+ } while (found_any);
+
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ assert(node->output_gamma_curve != GAMMA_INVALID);
+ }
+}
+
+// Make so that the output is in the desired gamma.
+// Note that this assumes linear input gamma, so it might create the need
+// for another pass of fix_internal_gamma().
+void EffectChain::fix_output_gamma()
+{
+ Node *output = find_output_node();
+ if (output->output_gamma_curve != output_format.gamma_curve) {
+ Node *conversion = add_node(new GammaCompressionEffect());
+ CHECK(conversion->effect->set_int("destination_curve", output_format.gamma_curve));
+ conversion->output_gamma_curve = output_format.gamma_curve;
+ connect_nodes(output, conversion);
+ }
+}
+
+// If the user has requested dither, add a DitherEffect right at the end
+// (after GammaCompressionEffect etc.). This needs to be done after everything else,
+// since dither is about the only effect that can _not_ be done in linear space.
+void EffectChain::add_dither_if_needed()
+{
+ if (num_dither_bits == 0) {
+ return;
+ }
+ Node *output = find_output_node();
+ Node *dither = add_node(new DitherEffect());
+ CHECK(dither->effect->set_int("num_bits", num_dither_bits));
+ connect_nodes(output, dither);
+
+ dither_effect = dither->effect;
+}
+
+// Find the output node. This is, simply, one that has no outgoing links.
+// If there are multiple ones, the graph is malformed (we do not support
+// multiple outputs right now).
+Node *EffectChain::find_output_node()
+{
+ std::vector<Node *> output_nodes;
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ Node *node = nodes[i];
+ if (node->disabled) {
+ continue;
+ }
+ if (node->outgoing_links.empty()) {
+ output_nodes.push_back(node);
+ }
+ }
+ assert(output_nodes.size() == 1);
+ return output_nodes[0];
+}
+
+void EffectChain::finalize()
+{
+ // Save the current locale, and set it to C, so that we can output decimal
+ // numbers with printf and be sure to get them in the format mandated by GLSL.
+ char *saved_locale = setlocale(LC_NUMERIC, "C");
+
+ // Output the graph as it is before we do any conversions on it.
+ output_dot("step0-start.dot");
+
+ // Give each effect in turn a chance to rewrite its own part of the graph.
+ // Note that if more effects are added as part of this, they will be
+ // picked up as part of the same for loop, since they are added at the end.
+ for (unsigned i = 0; i < nodes.size(); ++i) {
+ nodes[i]->effect->rewrite_graph(this, nodes[i]);
+ }
+ output_dot("step1-rewritten.dot");
+
+ find_color_spaces_for_inputs();
+ output_dot("step2-input-colorspace.dot");
+
+ propagate_alpha();
+ output_dot("step3-propagated-alpha.dot");
+
+ propagate_gamma_and_color_space();
+ output_dot("step4-propagated-all.dot");
+
+ fix_internal_color_spaces();
+ fix_internal_alpha(6);
+ fix_output_color_space();
+ output_dot("step7-output-colorspacefix.dot");
+ fix_output_alpha();
+ output_dot("step8-output-alphafix.dot");
+
+ // Note that we need to fix gamma after colorspace conversion,
+ // because colorspace conversions might create needs for gamma conversions.
+ // Also, we need to run an extra pass of fix_internal_gamma() after
+ // fixing the output gamma, as we only have conversions to/from linear,
+ // and fix_internal_alpha() since GammaCompressionEffect needs
+ // postmultiplied input.
+ fix_internal_gamma_by_asking_inputs(9);
+ fix_internal_gamma_by_inserting_nodes(10);
+ fix_output_gamma();
+ output_dot("step11-output-gammafix.dot");
+ propagate_alpha();
+ output_dot("step12-output-alpha-propagated.dot");
+ fix_internal_alpha(13);
+ output_dot("step14-output-alpha-fixed.dot");
+ fix_internal_gamma_by_asking_inputs(15);
+ fix_internal_gamma_by_inserting_nodes(16);
+
+ output_dot("step17-before-dither.dot");
+
+ add_dither_if_needed();
+
+ output_dot("step18-final.dot");
+
+ // Construct all needed GLSL programs, starting at the output.
+ construct_glsl_programs(find_output_node());
+
+ output_dot("step19-split-to-phases.dot");
+
+ // 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);
+
+ for (unsigned i = 0; i < phases.size() - 1; ++i) {
+ inform_input_sizes(phases[i]);
+ find_output_size(phases[i]);
+
+ Node *output_node = phases[i]->effects.back();
+ glGenTextures(1, &output_node->output_texture);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, output_node->output_texture);
+ 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();
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, phases[i]->output_width, phases[i]->output_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ check_error();
+
+ output_node->output_texture_width = phases[i]->output_width;
+ output_node->output_texture_height = phases[i]->output_height;
+ }
+ inform_input_sizes(phases.back());
+ }
+
+ for (unsigned i = 0; i < inputs.size(); ++i) {
+ inputs[i]->finalize();
+ }
+
+ assert(phases[0]->inputs.empty());
+
+ finalized = true;
+ setlocale(LC_NUMERIC, saved_locale);
+}
+
+void EffectChain::render_to_fbo(GLuint dest_fbo, unsigned width, unsigned height)
+{
+ assert(finalized);
+
+ // Save original viewport.
+ GLuint x = 0, y = 0;
+
+ if (width == 0 && height == 0) {
+ GLint viewport[4];
+ glGetIntegerv(GL_VIEWPORT, viewport);
+ x = viewport[0];
+ y = viewport[1];
+ width = viewport[2];
+ height = viewport[3];
+ }
+
+ // Basic state.