Adding the support for the subregion in the blur passes to apply it correctly to mini mirror

libraries/render-utils/src/deferred_light.slv

@@ -28,8 +28,8 @@ void main(void) {
 
     _texCoord0 = (pos.xy + 1) * 0.5;
 
-    _texCoord0 += texcoordFrameTransform.xy;
     _texCoord0 *= texcoordFrameTransform.zw;
+    _texCoord0 += texcoordFrameTransform.xy;
 
     gl_Position = pos;
 }

libraries/render-utils/src/point_light.slf

@@ -36,8 +36,8 @@ void main(void) {
 
     // Grab the fragment data from the uv
     vec2 texCoord = _texCoord0.st / _texCoord0.q;
-    texCoord += texcoordFrameTransform.xy;
     texCoord *= texcoordFrameTransform.zw;
+    texCoord += texcoordFrameTransform.xy;
 
     DeferredFragment frag = unpackDeferredFragment(deferredTransform, texCoord);
 

libraries/render-utils/src/spot_light.slf

@@ -36,8 +36,8 @@ void main(void) {
 
     // Grab the fragment data from the uv
     vec2 texCoord = _texCoord0.st / _texCoord0.q;
-    texCoord += texcoordFrameTransform.xy;
     texCoord *= texcoordFrameTransform.zw;
+    texCoord += texcoordFrameTransform.xy;
 
     DeferredFragment frag = unpackDeferredFragment(deferredTransform, texCoord);
 

libraries/render/src/render/BlurTask.cpp

@@ -49,6 +49,13 @@ void BlurParams::setWidthHeight(int width, int height, bool isStereo) {
     }
 }
 
+void BlurParams::setTexcoordTransform(const glm::vec4 texcoordTransformViewport) {
+    auto texcoordTransform = _parametersBuffer.get<Params>().texcoordTransform;
+    if (texcoordTransformViewport != texcoordTransform) {
+        _parametersBuffer.edit<Params>().texcoordTransform = texcoordTransform;
+    }
+}
+
 void BlurParams::setFilterRadiusScale(float scale) {
     auto filterInfo = _parametersBuffer.get<Params>().filterInfo;
     if (scale != filterInfo.x) {
@@ -211,6 +218,8 @@ void BlurGaussian::run(const SceneContextPointer& sceneContext, const RenderCont
     auto blurHPipeline = getBlurHPipeline();
 
     _parameters->setWidthHeight(args->_viewport.z, args->_viewport.w, args->_context->isStereo());
+    glm::ivec2 textureSize(blurringResources.sourceTexture->getDimensions());
+    _parameters->setTexcoordTransform(gpu::Framebuffer::evalSubregionTexcoordTransformCoefficients(textureSize, args->_viewport));
 
     gpu::doInBatch(args->_context, [=](gpu::Batch& batch) {
         batch.enableStereo(false);
@@ -320,6 +329,8 @@ void BlurGaussianDepthAware::run(const SceneContextPointer& sceneContext, const
     auto blurHPipeline = getBlurHPipeline();
 
     _parameters->setWidthHeight(args->_viewport.z, args->_viewport.w, args->_context->isStereo());
+    glm::ivec2 textureSize(blurringResources.sourceTexture->getDimensions());
+    _parameters->setTexcoordTransform(gpu::Framebuffer::evalSubregionTexcoordTransformCoefficients(textureSize, args->_viewport));
     _parameters->setDepthPerspective(args->getViewFrustum().getProjection()[1][1]);
 
     gpu::doInBatch(args->_context, [=](gpu::Batch& batch) {

libraries/render/src/render/BlurTask.h

@@ -22,6 +22,8 @@ public:
 
     void setWidthHeight(int width, int height, bool isStereo);
 
+    void setTexcoordTransform(const glm::vec4 texcoordTransformViewport);
+
     void setFilterRadiusScale(float scale);
 
     void setDepthPerspective(float oneOverTan2FOV);
@@ -33,6 +35,9 @@ public:
         // Resolution info (width, height, inverse of width, inverse of height)
         glm::vec4 resolutionInfo{ 0.0f, 0.0f, 0.0f, 0.0f };
 
+        // Viewport to Texcoord info, if the region of the blur (viewport) is smaller than the full frame
+        glm::vec4 texcoordTransform{ 0.0f, 0.0f, 1.0f, 1.0f };
+
         // Filter info (radius scale
         glm::vec4 filterInfo{ 1.0f, 0.0f, 0.0f, 0.0f };
 

libraries/render/src/render/BlurTask.slh

@@ -23,6 +23,7 @@ const float gaussianDistributionOffset[NUM_TAPS] = float[](
 
 struct BlurParameters {
     vec4 resolutionInfo;
+    vec4 texcoordTransform;
     vec4 filterInfo;
     vec4 depthInfo;
     vec4 stereoInfo;
@@ -36,6 +37,10 @@ vec2 getViewportInvWidthHeight() {
     return parameters.resolutionInfo.zw;
 }
 
+vec2 evalTexcoordTransformed(vec2 texcoord) {
+    return (texcoord * parameters.texcoordTransform.zw + parameters.texcoordTransform.xy);
+}
+
 float getFilterScale() {
     return parameters.filterInfo.x;
 }
@@ -59,7 +64,7 @@ float getDepthPerspective() {
 uniform sampler2D sourceMap;
 
 vec4 pixelShaderGaussian(vec2 texcoord, vec2 direction, vec2 pixelStep) {
-
+    texcoord = evalTexcoordTransformed(texcoord);
     vec4 sampleCenter = texture(sourceMap, texcoord);
 
     vec2 finalStep = getFilterScale() * direction * pixelStep;
@@ -86,7 +91,7 @@ uniform sampler2D sourceMap;
 uniform sampler2D depthMap;
 
 vec4 pixelShaderGaussianDepthAware(vec2 texcoord, vec2 direction, vec2 pixelStep) {
-
+    texcoord = evalTexcoordTransformed(texcoord);
     float sampleDepth = texture(depthMap, texcoord).x;
     vec4 sampleCenter = texture(sourceMap, texcoord);