Fixed D3D coord. system and ignoring guest CB alpha

nucleus/graphics/backend/direct3d12/direct3d12_shader.cpp

@@ -131,6 +131,9 @@ void Direct3D12Shader::appendOutput(Literal typeId, Literal resultId) {
             if (builtinType == BUILTIN_VERTEXID || builtinType == BUILTIN_INSTANCEID) {
                 type = "uint";
             }
+            if (builtinType == BUILTIN_POSITION) {
+                idBuiltinPosition = resultId;
+            }
             sourceOutput += format(PADDING "%s v%d : %s;\n", type.c_str(), resultId, getBuiltin(builtinType));
             return;
         }
@@ -515,6 +518,12 @@ std::string Direct3D12Shader::compile(Function* function) {
         source += compile(block);
     }
     if (idEntryPoint == funcId) {
+        if (shaderType == SHADER_TYPE_VERTEX) {
+            // Correct coordinate system on Z-axis (TODO: Implement proper system to detect BUILTIN_POSITION's)
+            if (idBuiltinPosition != 0) {
+                source += format(PADDING "output.v%d.z *= -1.0f;\n", idBuiltinPosition);
+            }
+        }
         source += PADDING "return output;\n";
     }
     source += "}\n\n";
@@ -599,7 +608,7 @@ bool Direct3D12Shader::initialize(const ShaderDesc& desc) {
     idCache.resize(module->idInstructions.size());
 
     std::string source = compile(module);
-    std::cout << source << std::endl;
+    // std::cout << source << std::endl;
 
     LPCSTR target;
     switch (desc.type) {

nucleus/graphics/backend/direct3d12/direct3d12_shader.h

@@ -36,6 +36,7 @@ class Direct3D12Shader : public Shader {
     int countArbitraryOutput;
     int countArbitraryCBV;
     hir::Literal idEntryPoint;
+    hir::Literal idBuiltinPosition;
     std::unordered_map<hir::Literal, std::vector<hir::Instruction*>> idDecoration;
     const char* getBuiltin(hir::Literal builtinDecoration);
 

nucleus/ui/screens/screen_emulator.cpp

@@ -19,6 +19,7 @@ ScreenEmulator::ScreenEmulator(UI* manager) : Screen(manager) {
     app->manager = manager;
     app->style.width = 100_pct;
     app->style.height = 100_pct;
+    app->opacityMin = 1.0f;
     body.addElement(app);
 }
 

nucleus/ui/widget.h

@@ -46,6 +46,7 @@ struct WidgetImageInput {
         float texcoord[2];
         float zindex;
         float opacity;
+        float opacityMin;
     } vertex[4];
 };
 struct WidgetTextInput {

nucleus/ui/widgets/widget_image.cpp

@@ -39,6 +39,7 @@ gfx::Pipeline* WidgetImage::createPipeline(gfx::IBackend& backend) {
         { 1, gfx::FORMAT_R32G32_FLOAT,  0,  8, 0, 0, gfx::INPUT_CLASSIFICATION_PER_VERTEX, 0 }, // TexCoord
         { 2, gfx::FORMAT_R32_FLOAT,     0, 16, 0, 0, gfx::INPUT_CLASSIFICATION_PER_VERTEX, 0 }, // Z-Index
         { 3, gfx::FORMAT_R32_FLOAT,     0, 20, 0, 0, gfx::INPUT_CLASSIFICATION_PER_VERTEX, 0 }, // Opacity
+        { 4, gfx::FORMAT_R32_FLOAT,     0, 24, 0, 0, gfx::INPUT_CLASSIFICATION_PER_VERTEX, 0 }, // OpacityMin
     };
     pipelineDesc.cbState.colorTarget[0] = {
         true, false,
@@ -151,6 +152,10 @@ void WidgetImage::render() {
     V1.opacity = style.opacity;
     V2.opacity = style.opacity;
     V3.opacity = style.opacity;
+    V0.opacityMin = opacityMin;
+    V1.opacityMin = opacityMin;
+    V2.opacityMin = opacityMin;
+    V3.opacityMin = opacityMin;
 
     // Texture coordinates assume top-left is (0,0) and bottom-right is (1,1)
     V0.texcoord[0] = 0.0; V0.texcoord[1] = 1.0;

nucleus/ui/widgets/widget_image.h

@@ -28,6 +28,11 @@ private:
 public:
     bool isColorTarget = false;
 
+    // Minimum opacity value
+    // The alpha channel of some images (e.g. guest GPU render targets)
+    // should be ignored while displaying the buffer on screen.
+    float opacityMin = 0.0;
+
     WidgetImage() {}
     WidgetImage(const std::string& id) : Widget(id) {}
     WidgetImage(Widget* parent, const std::string& id = "") : Widget(parent, id) {}

resources/shaders/ui_widget_image_ps.glsl

@@ -5,6 +5,7 @@ in vec4 gl_FragCoord;
 layout (location = 0) in vec2 iTexcoord;
 layout (location = 1) in float iZindex;
 layout (location = 2) in float iOpacity;
+layout (location = 3) in float iOpacityMin;
 
 // Outputs
 layout (location = 0) out vec4 result;
@@ -15,4 +16,5 @@ layout (binding = 0) uniform sampler2D s;
 void main() {
     result = texture(s, iTexcoord.xy);
     result.a *= iOpacity;
+    result.a += iOpacityMin;
 }

resources/shaders/ui_widget_image_vs.glsl

@@ -4,14 +4,17 @@ layout (location = 0) in vec2 iPosition;
 layout (location = 1) in vec2 iTexcoord;
 layout (location = 2) in float iZindex;
 layout (location = 3) in float iOpacity;
+layout (location = 4) in float iOpacityMin;
 
 layout (location = 0) out vec2 oTexcoord;
 layout (location = 1) out float oZindex;
 layout (location = 2) out float oOpacity;
+layout (location = 3) out float oOpacityMin;
 
 void main() {
     gl_Position = vec4(iPosition, 0.0, 1.0);
     oTexcoord = iTexcoord;
     oZindex = iZindex;
     oOpacity = iOpacity;
+    oOpacityMin = iOpacityMin;
 }