rendergraph: use opengl node and add shaders

CMakeLists.txt

@@ -4573,7 +4573,9 @@ if(VINYLCONTROL)
 endif()
 
 # rendergraph
-add_subdirectory(src/rendergraph/opengl)
+add_subdirectory(src/rendergraph)
+target_link_libraries(mixxx-lib PUBLIC rendergraph_gl)
+target_compile_definitions(mixxx-lib PUBLIC rendergraph=rendergraph_gl)
 
 # WavPack audio file support
 find_package(wavpack)

src/rendergraph/CMakeLists.txt

@@ -39,5 +39,8 @@ set(
 )
 
 add_subdirectory(opengl)
-add_subdirectory(scenegraph)
+#################################
+# TODO: uncomment in follow-up PR
+# add_subdirectory(scenegraph)
+#################################
 add_subdirectory(shaders)

src/rendergraph/opengl/rendergraph/nodeinterface.h

@@ -7,14 +7,17 @@ namespace rendergraph {
 template<class T_Node>
 class NodeInterface : public T_Node {
   public:
-    void appendChildNode(std::unique_ptr<BaseNode> pNode) {
+    template<class T_AppendNode>
+    T_AppendNode* appendChildNode(std::unique_ptr<T_AppendNode> pNode) {
         // Transfers ownership to this.
-        BaseNode* pRawNode = pNode.release();
+        T_AppendNode* pRawNode = pNode.release();
         // Note: Ideally we would use unique_ptrs internally, but
         // Qt uses raw pointers for QSGNode hierarchy. For simplicity
         // we mimic this.
 
         T_Node::appendChildNode(pRawNode);
+
+        return pRawNode;
     }
 
     std::unique_ptr<BaseNode> detachChildNode(BaseNode* pNode) {

src/rendergraph/scenegraph/rendergraph/nodeinterface.h

@@ -8,11 +8,13 @@ namespace rendergraph {
 template<class T_Node>
 class NodeInterface : public T_Node {
   public:
-    void appendChildNode(std::unique_ptr<BaseNode> pNode) {
-        BaseNode* pRawNode = pNode.release();
+    template<class T_AppendNode>
+    T_AppendNode* appendChildNode(std::unique_ptr<T_AppendNode> pNode) {
+        T_AppendNode* pRawNode = pNode.release();
         pRawNode->setFlag(QSGNode::OwnedByParent, true);
         T_Node::appendChildNode(pRawNode);
         DEBUG_ASSERT(pRawNode->flags() & QSGNode::OwnedByParent);
+        return pRawNode;
     }
     std::unique_ptr<BaseNode> detachChildNode(BaseNode* pNode) {
         DEBUG_ASSERT(pNode->flags() & QSGNode::OwnedByParent);

src/rendergraph/shaders/CMakeLists.txt

@@ -0,0 +1,57 @@
+# included from src/rendergraph/CMakeLists.txt
+
+set(
+  shaders
+  pattern.frag
+  pattern.vert
+  rgb.frag
+  rgb.vert
+  rgba.frag
+  rgba.vert
+  texture.frag
+  texture.vert
+  unicolor.frag
+  unicolor.vert
+)
+
+if(TARGET rendergraph_sg)
+  qt6_add_shaders(rendergraph_sg "shaders-qsb"
+      BATCHABLE
+      PRECOMPILE
+      OPTIMIZED
+      PREFIX
+          /shaders/rendergraph
+      FILES
+          ${shaders}
+  )
+endif()
+
+if(TARGET rendergraph_gl)
+  # USE_QSHADER_FOR_GL is set in src/rendergraph/CMakeLists.txt when Qt >= 6.6
+  if(USE_QSHADER_FOR_GL)
+    # Add the .qsb shader bundles; rendergraph::MaterialShader will use
+    # QShader to extract the GLSL shader from the bundle.
+    message(STATUS "Adding qsb shaders to rendergraph_gl")
+    qt6_add_shaders(rendergraph_gl "shaders-qsb"
+          BATCHABLE
+          PRECOMPILE
+          OPTIMIZED
+          PREFIX
+              /shaders/rendergraph
+          FILES
+              ${shaders}
+    )
+  else()
+    # Use GLSL shaders extracted from the .qsb shader bundles using
+    # generate_shaders_gl.pl
+    message(STATUS "Adding gl shaders to rendergraph_gl")
+    include(generated_shaders_gl.cmake)
+
+    qt_add_resources(rendergraph_gl "shaders-gl"
+          PREFIX
+              /shaders/rendergraph
+          FILES
+              ${generated_shaders_gl}
+    )
+  endif()
+endif()

src/rendergraph/shaders/README.md

@@ -0,0 +1,34 @@
+# rendergraph shaders
+
+The CMakeLists.txt in this folder generates qsb shader bundles from spirv shaders, to
+be used by `rendergraph::MaterialShader`.
+
+## For use with QML / Qt scene graph
+
+The qsb files can be used directly through `QSGShader`. This includes the scenegraph
+implementation of rendergraph.
+
+## For use with OpenGL
+
+Depending on the Qt version, the opengl implementation of `rendergraph::MaterialShader`
+uses either the .qsb shader bundles directly, or the extracted GLSL shaders:
+
+### Qt >= 6.6
+
+The GLSL shaders are extracted programmatically with `QShader` and then used with
+`QOpenGLShader`.
+
+### Qt < 6.6
+
+The GLSL shader have to extracted from the qsb shader bundles to be used by `QOpenGLShader`.
+This can be done using the script `rg_generate_shaders_gl.py` in the mixxx/tools directory:
+
+```console
+$ ../../../tools/rg_generate_shaders_gl.py --cmake generated_shaders_gl.cmake *.vert *.frag
+```
+
+To use this script, make sure that the qsb and spirv commands are in your path. qsb is part
+of Qt. spirv is part of the Vulkan SDK and can be downloaded from <https://vulkan.org>
+
+The script also generates the file `generated_shaders_gl.cmake` which sets a cmake
+variable containing a list of all GLSL shaders, used by the CMakeLists.txt in this folder.

src/rendergraph/shaders/generated_shaders_gl.cmake

@@ -0,0 +1,13 @@
+set(
+  generated_shaders_gl
+  pattern.frag.gl
+  pattern.vert.gl
+  rgb.frag.gl
+  rgb.vert.gl
+  rgba.frag.gl
+  rgba.vert.gl
+  texture.frag.gl
+  texture.vert.gl
+  unicolor.frag.gl
+  unicolor.vert.gl
+)

src/rendergraph/shaders/pattern.frag

@@ -0,0 +1,9 @@
+#version 440
+
+layout(binding = 1) uniform sampler2D texture1;
+layout(location = 0) in vec2 vTexcoord;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    fragColor = texture(texture1, fract(vTexcoord));
+}

src/rendergraph/shaders/pattern.frag.gl

@@ -0,0 +1,11 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+uniform sampler2D texture1;
+
+varying vec2 vTexcoord;
+
+void main()
+{
+    gl_FragData[0] = texture2D(texture1, fract(vTexcoord));
+}

src/rendergraph/shaders/pattern.vert

@@ -0,0 +1,15 @@
+#version 440
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+}
+ubuf;
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec2 texcoord;
+layout(location = 0) out vec2 vTexcoord;
+
+void main() {
+    vTexcoord = texcoord;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/pattern.vert.gl

@@ -0,0 +1,19 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+struct buf
+{
+    mat4 matrix;
+};
+
+uniform buf ubuf;
+
+varying vec2 vTexcoord;
+attribute vec2 texcoord;
+attribute vec4 position;
+
+void main()
+{
+    vTexcoord = texcoord;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/rgb.frag

@@ -0,0 +1,8 @@
+#version 440
+
+layout(location = 0) in vec3 vColor;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    fragColor = vec4(vColor, 1.0);
+}

src/rendergraph/shaders/rgb.frag.gl

@@ -0,0 +1,9 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+varying vec3 vColor;
+
+void main()
+{
+    gl_FragData[0] = vec4(vColor, 1.0);
+}

src/rendergraph/shaders/rgb.vert

@@ -0,0 +1,15 @@
+#version 440
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+}
+ubuf;
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec3 color;
+layout(location = 0) out vec3 vColor;
+
+void main() {
+    vColor = color;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/rgb.vert.gl

@@ -0,0 +1,19 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+struct buf
+{
+    mat4 matrix;
+};
+
+uniform buf ubuf;
+
+varying vec3 vColor;
+attribute vec3 color;
+attribute vec4 position;
+
+void main()
+{
+    vColor = color;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/rgba.frag

@@ -0,0 +1,8 @@
+#version 440
+
+layout(location = 0) in vec4 vColor;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    fragColor = vec4(vColor.xyz * vColor.w, vColor.w); // premultiple alpha
+}

src/rendergraph/shaders/rgba.frag.gl

@@ -0,0 +1,9 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+varying vec4 vColor;
+
+void main()
+{
+    gl_FragData[0] = vec4(vColor.xyz * vColor.w, vColor.w);
+}

src/rendergraph/shaders/rgba.vert

@@ -0,0 +1,15 @@
+#version 440
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+}
+ubuf;
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec4 color;
+layout(location = 0) out vec4 vColor;
+
+void main() {
+    vColor = color;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/rgba.vert.gl

@@ -0,0 +1,19 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+struct buf
+{
+    mat4 matrix;
+};
+
+uniform buf ubuf;
+
+varying vec4 vColor;
+attribute vec4 color;
+attribute vec4 position;
+
+void main()
+{
+    vColor = color;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/texture.frag

@@ -0,0 +1,9 @@
+#version 440
+
+layout(binding = 1) uniform sampler2D texture1;
+layout(location = 0) in vec2 vTexcoord;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    fragColor = texture(texture1, vTexcoord);
+}

src/rendergraph/shaders/texture.frag.gl

@@ -0,0 +1,11 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+uniform sampler2D texture1;
+
+varying vec2 vTexcoord;
+
+void main()
+{
+    gl_FragData[0] = texture2D(texture1, vTexcoord);
+}

src/rendergraph/shaders/texture.vert

@@ -0,0 +1,15 @@
+#version 440
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+}
+ubuf;
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec2 texcoord;
+layout(location = 0) out vec2 vTexcoord;
+
+void main() {
+    vTexcoord = texcoord;
+    gl_Position = ubuf.matrix * position;
+}

src/rendergraph/shaders/texture.vert.gl

@@ -0,0 +1,19 @@
+#version 120
+//// GENERATED - EDITS WILL BE OVERWRITTEN
+
+struct buf
+{
+    mat4 matrix;
+};
+
+uniform buf ubuf;
+
+varying vec2 vTexcoord;
+attribute vec2 texcoord;
+attribute vec4 position;
+
+void main()
+{
+    vTexcoord = texcoord;
+    gl_Position = ubuf.matrix * position;
+}