Add input support for packed 10-bit Y'CbCr.

[movit] / effect_chain.cpp

diff --git a/effect_chain.cpp b/effect_chain.cpp
index fa7340d7a456839f7ef2563d76c5a872182491ff..4d13d3f8d30c6f24c0520f4c4633e864b9d12904 100644 (file)
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -32,13 +32,14 @@ using namespace std;
 
 namespace movit {
 
-EffectChain::EffectChain(float aspect_nom, float aspect_denom, ResourcePool *resource_pool, GLenum intermediate_format)
+EffectChain::EffectChain(float aspect_nom, float aspect_denom, ResourcePool *resource_pool)
        : aspect_nom(aspect_nom),
          aspect_denom(aspect_denom),
          output_color_rgba(false),
          output_color_ycbcr(false),
          dither_effect(NULL),
-         intermediate_format(intermediate_format),
+         intermediate_format(GL_RGBA16F),
+         intermediate_transformation(NO_FRAMEBUFFER_TRANSFORMATION),
          num_dither_bits(0),
          output_origin(OUTPUT_ORIGIN_BOTTOM_LEFT),
          finalized(false),
@@ -109,6 +110,29 @@ void EffectChain::add_ycbcr_output(const ImageFormat &format, OutputAlphaFormat
        assert(ycbcr_format.chroma_subsampling_y == 1);
 }
 
+void EffectChain::change_ycbcr_output_format(const YCbCrFormat &ycbcr_format)
+{
+       assert(output_color_ycbcr);
+       assert(output_ycbcr_format.chroma_subsampling_x == ycbcr_format.chroma_subsampling_x);
+       assert(output_ycbcr_format.chroma_subsampling_y == ycbcr_format.chroma_subsampling_y);
+       assert(fabs(output_ycbcr_format.cb_x_position - ycbcr_format.cb_x_position) < 1e-3);
+       assert(fabs(output_ycbcr_format.cb_y_position - ycbcr_format.cb_y_position) < 1e-3);
+       assert(fabs(output_ycbcr_format.cr_x_position - ycbcr_format.cr_x_position) < 1e-3);
+       assert(fabs(output_ycbcr_format.cr_y_position - ycbcr_format.cr_y_position) < 1e-3);
+
+       output_ycbcr_format = ycbcr_format;
+       if (finalized) {
+               // Find the YCbCrConversionEffect node. We don't store it to avoid
+               // an unneeded ABI break (this can be fixed on next break).
+               for (Node *node : nodes) {
+                       if (node->effect->effect_type_id() == "YCbCrConversionEffect") {
+                               YCbCrConversionEffect *effect = (YCbCrConversionEffect *)(node->effect);
+                               effect->change_output_format(ycbcr_format);
+                       }
+               }
+       }
+}
+
 Node *EffectChain::add_node(Effect *effect)
 {
        for (unsigned i = 0; i < nodes.size(); ++i) {
@@ -332,7 +356,14 @@ void EffectChain::compile_glsl_program(Phase *phase)
        
                frag_shader += string("uniform sampler2D tex_") + effect_id + ";\n";
                frag_shader += string("vec4 ") + effect_id + "(vec2 tc) {\n";
-               frag_shader += "\treturn tex2D(tex_" + string(effect_id) + ", tc);\n";
+               frag_shader += "\tvec4 tmp = tex2D(tex_" + string(effect_id) + ", tc);\n";
+
+               if (intermediate_transformation == SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION &&
+                   phase->inputs[i]->output_node->output_gamma_curve == GAMMA_LINEAR) {
+                       frag_shader += "\ttmp.rgb *= tmp.rgb;\n";
+               }
+
+               frag_shader += "\treturn tmp;\n";
                frag_shader += "}\n";
                frag_shader += "\n";
 
@@ -415,6 +446,15 @@ void EffectChain::compile_glsl_program(Phase *phase)
                        frag_shader_outputs.push_back("RGBA");
                }
        }
+
+       // If we're bouncing to a temporary texture, signal transformation if desired.
+       if (!phase->output_node->outgoing_links.empty()) {
+               if (intermediate_transformation == SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION &&
+                   phase->output_node->output_gamma_curve == GAMMA_LINEAR) {
+                       frag_shader += "#define SQUARE_ROOT_TRANSFORMATION 1\n";
+               }
+       }
+
        frag_shader.append(read_file("footer.frag"));
 
        // Collect uniforms from all effects and output them. Note that this needs
@@ -1176,6 +1216,11 @@ void EffectChain::propagate_alpha()
 
                if (alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
                    alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
+                       // This combination (requiring premultiplied alpha, but _not_ requiring
+                       // linear light) is illegal, since the combination of premultiplied alpha
+                       // and nonlinear inputs is meaningless.
+                       assert(node->effect->needs_linear_light());
+
                        // If the effect has asked for premultiplied alpha, check that it has got it.
                        if (any_postmultiplied) {
                                node->output_alpha_type = ALPHA_INVALID;
@@ -1860,9 +1905,6 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase,
                output_textures->insert(make_pair(phase, tex_num));
        }
 
-       glUseProgram(phase->glsl_program_num);
-       check_error();
-
        // Set up RTT inputs for this phase.
        for (unsigned sampler = 0; sampler < phase->inputs.size(); ++sampler) {
                glActiveTexture(GL_TEXTURE0 + sampler);
@@ -1886,12 +1928,15 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase,
                glViewport(0, 0, phase->output_width, phase->output_height);
        }
 
+       GLuint instance_program_num = resource_pool->use_glsl_program(phase->glsl_program_num);
+       check_error();
+
        // Give the required parameters to all the effects.
        unsigned sampler_num = phase->inputs.size();
        for (unsigned i = 0; i < phase->effects.size(); ++i) {
                Node *node = phase->effects[i];
                unsigned old_sampler_num = sampler_num;
-               node->effect->set_gl_state(phase->glsl_program_num, phase->effect_ids[node], &sampler_num);
+               node->effect->set_gl_state(instance_program_num, phase->effect_ids[node], &sampler_num);
                check_error();
 
                if (node->effect->is_single_texture()) {
@@ -1939,6 +1984,8 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase,
                node->effect->clear_gl_state();
        }
 
+       resource_pool->unuse_glsl_program(instance_program_num);
+
        if (!last_phase) {
                resource_pool->release_fbo(fbo);
        }