feat(shaders): sistema de shaders runtime amb presets externs
- Afegir GpuShaderPreset i ShaderManager per carregar shaders des de data/shaders/ - Implementar preset ntsc-md-rainbows (2 passos: encode + decode MAME NTSC) - Render loop multi-pass per shaders externs (targets intermedis R16G16B16A16_FLOAT) - cycleShader(): cicla OFF→PostFX natius→shaders externs amb tecla X - --shader <nom> per arrancar directament amb un preset extern - CMake auto-descubreix i compila data/shaders/**/*.vert/.frag → .spv - HUD F1 mostra 'Shader: <nom>' quan hi ha shader extern actiu Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@@ -336,7 +336,9 @@ void UIManager::renderDebugHUD(const Engine* engine,
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lines.push_back(refresh_text);
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lines.push_back(theme_text);
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std::string postfx_text;
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if (!engine->isPostFXEnabled()) {
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if (engine->isExternalShaderActive()) {
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postfx_text = "Shader: " + engine->getActiveShaderName();
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} else if (!engine->isPostFXEnabled()) {
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postfx_text = "PostFX: OFF";
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} else {
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static constexpr const char* preset_names[4] = {
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