Re-enable downsampling for non-sparse textures

libraries/gpu-gl/src/gpu/gl/GLTexture.cpp

@@ -116,7 +116,7 @@ float GLTexture::getMemoryPressure() {
     }
 
     // Return the consumed texture memory divided by the available texture memory.
-    auto consumedGpuMemory = Context::getTextureGPUSparseMemoryUsage();
+    auto consumedGpuMemory = Context::getTextureGPUMemoryUsage() - Context::getTextureGPUFramebufferMemoryUsage();
     float memoryPressure = (float)consumedGpuMemory / (float)availableTextureMemory;
     static Context::Size lastConsumedGpuMemory = 0;
     if (memoryPressure > 1.0f && lastConsumedGpuMemory != consumedGpuMemory) {

libraries/gpu-gl/src/gpu/gl45/GL45Backend.h

@@ -94,6 +94,7 @@ public:
         TransferState _transferState;
         uint32_t _allocatedPages { 0 };
         uint32_t _lastMipAllocatedPages { 0 };
+        uint16_t _mipOffset { 0 };
         friend class GL45Backend;
     };
 

libraries/gpu-gl/src/gpu/gl45/GL45BackendTexture.cpp

@@ -282,10 +282,9 @@ GL45Texture::~GL45Texture() {
     if (!_gpuObject.getUsage().isExternal()) {
         qCDebug(gpugl45logging) << "Destroying texture " << _id << " from source " << _source.c_str();
     }
-    if (_sparseInfo.sparse) {
+
-        Backend::decrementTextureGPUSparseCount();
     // Remove this texture from the candidate list of derezzable textures
-        {
+    if (_transferrable) {
         auto mipLevels = usedMipLevels();
         Lock lock(texturesByMipCountsMutex);
         if (texturesByMipCounts.count(mipLevels)) {
@@ -297,6 +296,9 @@ GL45Texture::~GL45Texture() {
         }
     }
 
+    if (_sparseInfo.sparse) {
+        Backend::decrementTextureGPUSparseCount();
+
         // Experimenation suggests that allocating sparse textures on one context/thread and deallocating 
         // them on another is buggy.  So for sparse textures we need to queue a lambda with the deallocation 
         // callls to the transfer thread
@@ -355,7 +357,7 @@ void GL45Texture::allocateStorage() const {
     glTextureParameteri(_id, GL_TEXTURE_BASE_LEVEL, 0);
     glTextureParameteri(_id, GL_TEXTURE_MAX_LEVEL, _maxMip - _minMip);
     // Get the dimensions, accounting for the downgrade level
-    Vec3u dimensions = _gpuObject.evalMipDimensions(_minMip);
+    Vec3u dimensions = _gpuObject.evalMipDimensions(_minMip + _mipOffset);
     glTextureStorage2D(_id, usedMipLevels(), _internalFormat, dimensions.x, dimensions.y);
     (void)CHECK_GL_ERROR();
 }
@@ -370,7 +372,7 @@ void GL45Texture::updateSize() const {
         Backend::updateTextureGPUSparseMemoryUsage(_size, size);
         setSize(_allocatedPages * _sparseInfo.pageBytes);
     } else {
-        setSize(_virtualSize);
+        setSize(_gpuObject.evalTotalSize(_mipOffset));
     }
 }
 
@@ -481,35 +483,30 @@ void GL45Texture::syncSampler() const {
     glTextureParameteri(_id, GL_TEXTURE_WRAP_T, WRAP_MODES[sampler.getWrapModeV()]);
     glTextureParameteri(_id, GL_TEXTURE_WRAP_R, WRAP_MODES[sampler.getWrapModeW()]);
     glTextureParameterfv(_id, GL_TEXTURE_BORDER_COLOR, (const float*)&sampler.getBorderColor());
+    // FIXME account for mip offsets here
     auto baseMip = std::max<uint16_t>(sampler.getMipOffset(), _minMip);
     glTextureParameteri(_id, GL_TEXTURE_BASE_LEVEL, baseMip);
     glTextureParameterf(_id, GL_TEXTURE_MIN_LOD, (float)sampler.getMinMip());
-    glTextureParameterf(_id, GL_TEXTURE_MAX_LOD, (sampler.getMaxMip() == Sampler::MAX_MIP_LEVEL ? 1000.f : sampler.getMaxMip()));
+    glTextureParameterf(_id, GL_TEXTURE_MAX_LOD, (sampler.getMaxMip() == Sampler::MAX_MIP_LEVEL ? 1000.f : sampler.getMaxMip() - _mipOffset));
     glTextureParameterf(_id, GL_TEXTURE_MAX_ANISOTROPY_EXT, sampler.getMaxAnisotropy());
 }
 
 void GL45Texture::postTransfer() {
     Parent::postTransfer();
-    if (_sparseInfo.sparse) {
     auto mipLevels = usedMipLevels();
-        if (mipLevels > 1 && _minMip < _sparseInfo.maxSparseLevel) {
+    if (_transferrable && mipLevels > 1 && _minMip < _sparseInfo.maxSparseLevel) {
         Lock lock(texturesByMipCountsMutex);
         texturesByMipCounts[mipLevels].insert(this);
     }
-    }
 }
 
 void GL45Texture::stripToMip(uint16_t newMinMip) {
-    if (!_sparseInfo.sparse) {
-        return;
-    }
-
     if (newMinMip < _minMip) {
         qCWarning(gpugl45logging) << "Cannot decrease the min mip";
         return;
     }
 
-    if (newMinMip > _sparseInfo.maxSparseLevel) {
+    if (_sparseInfo.sparse && newMinMip > _sparseInfo.maxSparseLevel) {
         qCWarning(gpugl45logging) << "Cannot increase the min mip into the mip tail";
         return;
     }
@@ -533,6 +530,7 @@ void GL45Texture::stripToMip(uint16_t newMinMip) {
 
 
     uint8_t maxFace = (uint8_t)((_target == GL_TEXTURE_CUBE_MAP) ? GLTexture::CUBE_NUM_FACES : 1);
+    if (_sparseInfo.sparse) {
         for (uint16_t mip = _minMip; mip < newMinMip; ++mip) {
             auto id = _id;
             auto mipDimensions = _gpuObject.evalMipDimensions(mip);
@@ -544,8 +542,41 @@ void GL45Texture::stripToMip(uint16_t newMinMip) {
             assert(deallocatedPages < _allocatedPages);
             _allocatedPages -= deallocatedPages;
         }
-
         _minMip = newMinMip;
+    } else {
+        GLuint oldId = _id;
+        // Find the distance between the old min mip and the new one
+        uint16 mipDelta = newMinMip - _minMip;
+        _mipOffset += mipDelta;
+        const_cast<uint16&>(_maxMip) -= mipDelta;
+        auto newLevels = usedMipLevels();
+
+        // Create and setup the new texture (allocate)
+        glCreateTextures(_target, 1, &const_cast<GLuint&>(_id));
+        glTextureParameteri(_id, GL_TEXTURE_BASE_LEVEL, 0);
+        glTextureParameteri(_id, GL_TEXTURE_MAX_LEVEL, _maxMip - _minMip);
+        Vec3u newDimensions = _gpuObject.evalMipDimensions(_mipOffset);
+        glTextureStorage2D(_id, newLevels, _internalFormat, newDimensions.x, newDimensions.y);
+
+        // Copy the contents of the old texture to the new
+        GLuint fbo { 0 };
+        glCreateFramebuffers(1, &fbo);
+        glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
+        for (uint16 targetMip = _minMip; targetMip <= _maxMip; ++targetMip) {
+            uint16 sourceMip = targetMip + mipDelta;
+            Vec3u mipDimensions = _gpuObject.evalMipDimensions(targetMip + _mipOffset);
+            for (GLenum target : getFaceTargets(_target)) {
+                glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, oldId, sourceMip);
+                (void)CHECK_GL_ERROR();
+                glCopyTextureSubImage2D(_id, targetMip, 0, 0, 0, 0, mipDimensions.x, mipDimensions.y);
+                (void)CHECK_GL_ERROR();
+            }
+        }
+        glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+        glDeleteFramebuffers(1, &fbo);
+        glDeleteTextures(1, &oldId);
+    }
+
     // Re-sync the sampler to force access to the new mip level
     syncSampler();
     updateSize();
@@ -553,7 +584,7 @@ void GL45Texture::stripToMip(uint16_t newMinMip) {
 
     // Re-insert into the texture-by-mips map if appropriate
     mipLevels = usedMipLevels();
-    if (_sparseInfo.sparse && mipLevels > 1 && _minMip < _sparseInfo.maxSparseLevel) {
+    if (mipLevels > 1 && (!_sparseInfo.sparse || _minMip < _sparseInfo.maxSparseLevel)) {
         Lock lock(texturesByMipCountsMutex);
         texturesByMipCounts[mipLevels].insert(this);
     }
@@ -570,8 +601,9 @@ void GL45Texture::updateMips() {
 }
 
 void GL45Texture::derez() {
-    assert(_sparseInfo.sparse);
+    if (_sparseInfo.sparse) {
         assert(_minMip < _sparseInfo.maxSparseLevel);
+    }
     assert(_minMip < _maxMip);
     assert(_transferrable);
     stripToMip(_minMip + 1);
@@ -595,7 +627,7 @@ void GL45Backend::derezTextures() const {
     }
 
     qCDebug(gpugl45logging) << "Allowed texture memory " << Texture::getAllowedGPUMemoryUsage();
-    qCDebug(gpugl45logging) << "Used texture memory " << Context::getTextureGPUMemoryUsage();
+    qCDebug(gpugl45logging) << "Used texture memory " << (Context::getTextureGPUMemoryUsage() - Context::getTextureGPUFramebufferMemoryUsage());
 
     GL45Texture* targetTexture = nullptr;
     {
@@ -605,5 +637,5 @@ void GL45Backend::derezTextures() const {
     }
     lock.unlock();
     targetTexture->derez();
-    qCDebug(gpugl45logging) << "New Used texture memory " << Context::getTextureGPUMemoryUsage();
+    qCDebug(gpugl45logging) << "New Used texture memory " << (Context::getTextureGPUMemoryUsage() - Context::getTextureGPUFramebufferMemoryUsage());
 }

libraries/gpu/src/gpu/Texture.cpp

@@ -15,6 +15,7 @@
 #include "Texture.h"
 
 #include <glm/gtc/constants.hpp>
+#include <glm/gtx/component_wise.hpp>
 
 #include <NumericalConstants.h>
 
@@ -418,12 +419,18 @@ uint16 Texture::evalDimNumMips(uint16 size) {
     return 1 + (uint16) val;
 }
 
+static const double LOG_2 = log(2.0);
+
+uint16 Texture::evalNumMips(const Vec3u& dimensions) {
+    double largerDim = glm::compMax(dimensions);
+    double val = log(largerDim) / LOG_2;
+    return 1 + (uint16)val;
+}
+
 // The number mips that the texture could have if all existed
 // = log2(max(width, height, depth))
 uint16 Texture::evalNumMips() const {
-    double largerDim = std::max(std::max(_width, _height), _depth);
+    return evalNumMips({ _width, _height, _depth });
-    double val = log(largerDim)/log(2.0);
-    return 1 + (uint16) val;
 }
 
 bool Texture::assignStoredMip(uint16 level, const Element& format, Size size, const Byte* bytes) {

libraries/gpu/src/gpu/Texture.h

@@ -369,9 +369,12 @@ public:
     // = 1 + log2(max(width, height, depth))
     uint16 evalNumMips() const;
 
+    static uint16 evalNumMips(const Vec3u& dimnsions);
+
     // Eval the size that the mips level SHOULD have
     // not the one stored in the Texture
     static const uint MIN_DIMENSION = 1;
+
     Vec3u evalMipDimensions(uint16 level) const;
     uint16 evalMipWidth(uint16 level) const { return std::max(_width >> level, 1); }
     uint16 evalMipHeight(uint16 level) const { return std::max(_height >> level, 1); }
@@ -388,9 +391,9 @@ public:
     uint32 evalStoredMipFaceSize(uint16 level, const Element& format) const { return evalMipFaceNumTexels(level) * format.getSize(); }
     uint32 evalStoredMipSize(uint16 level, const Element& format) const { return evalMipNumTexels(level) * format.getSize(); }
 
-    uint32 evalTotalSize() const {
+    uint32 evalTotalSize(uint16 startingMip = 0) const {
         uint32 size = 0;
-        uint16 minMipLevel = minMip();
+        uint16 minMipLevel = std::max(minMip(), startingMip);
         uint16 maxMipLevel = maxMip();
         for (uint16 l = minMipLevel; l <= maxMipLevel; l++) {
             size += evalMipSize(l);

tests/render-perf/src/main.cpp

@@ -599,7 +599,7 @@ protected:
             return;
 
         case Qt::Key_End:
-            gpu::Texture::setAllowedGPUMemoryUsage(MB_TO_BYTES(256));
+            gpu::Texture::setAllowedGPUMemoryUsage(MB_TO_BYTES(64));
             return;