Add GrMtlTexture classes

Adds support for basic Texture creation.

Bug: skia:
Change-Id: I9a3f15bef1c88054c19e952e231cad94ad69f296
Reviewed-on: https://skia-review.googlesource.com/30781
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

7 files changed, 218 insertions, 4 deletions

diff --git a/gn/gpu.gni b/gn/gpu.gni
index 9bd28e19f1..e9b33ed58c 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -585,6 +585,8 @@ skia_metal_sources = [
   "$_src/gpu/mtl/GrMtlCaps.mm",
   "$_src/gpu/mtl/GrMtlGpu.h",
   "$_src/gpu/mtl/GrMtlGpu.mm",
+  "$_src/gpu/mtl/GrMtlTexture.mm",
+  "$_src/gpu/mtl/GrMtlTexture.h",
   "$_src/gpu/mtl/GrMtlTrampoline.h",
   "$_src/gpu/mtl/GrMtlTrampoline.mm",
   "$_src/gpu/mtl/GrMtlUtil.h",
diff --git a/src/gpu/mtl/GrMtlGpu.h b/src/gpu/mtl/GrMtlGpu.h
index c812843950..06c2b2fc5e 100644
--- a/src/gpu/mtl/GrMtlGpu.h
+++ b/src/gpu/mtl/GrMtlGpu.h
@@ -26,9 +26,11 @@ public:
                          id<MTLDevice> device, id<MTLCommandQueue> queue);
 
     ~GrMtlGpu() override {}
- 
+
     const GrMtlCaps& mtlCaps() const { return *fMtlCaps.get(); }
 
+    id<MTLDevice> device() const { return fDevice; }
+
     bool onGetReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight, size_t rowBytes,
                              GrPixelConfig readConfig, DrawPreference*,
                              ReadPixelTempDrawInfo*) override { return false; }
@@ -72,9 +74,7 @@ private:
     void xferBarrier(GrRenderTarget*, GrXferBarrierType) override {}
 
     sk_sp<GrTexture> onCreateTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted,
-                                     const GrMipLevel texels[], int mipLevelCount) override {
-        return nullptr;
-    }
+                                     const GrMipLevel texels[], int mipLevelCount) override;
 
     sk_sp<GrTexture> onWrapBackendTexture(const GrBackendTexture&,
                                           GrSurfaceOrigin,
diff --git a/src/gpu/mtl/GrMtlGpu.mm b/src/gpu/mtl/GrMtlGpu.mm
index 7a9a673d69..a830959bdd 100644
--- a/src/gpu/mtl/GrMtlGpu.mm
+++ b/src/gpu/mtl/GrMtlGpu.mm
@@ -7,6 +7,8 @@
 
 #include "GrMtlGpu.h"
 
+#include "GrMtlTexture.h"
+
 #if !__has_feature(objc_arc)
 #error This file must be compiled with Arc. Use -fobjc-arc flag
 #endif
@@ -103,3 +105,42 @@ GrMtlGpu::GrMtlGpu(GrContext* context, const GrContextOptions& options,
     // Unused queue warning fix
     SkDebugf("ptr to queue: %p\n", fQueue);
 }
+
+sk_sp<GrTexture> GrMtlGpu::onCreateTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted,
+                                           const GrMipLevel texels[], int mipLevelCount) {
+    int mipLevels = !mipLevelCount ? 1 : mipLevelCount;
+
+    if (!fMtlCaps->isConfigTexturable(desc.fConfig)) {
+        return nullptr;
+    }
+
+    bool renderTarget = SkToBool(desc.fFlags & kRenderTarget_GrSurfaceFlag);
+    if (renderTarget) {
+        // Current we don't have render target support
+        return nullptr;
+    }
+
+    sk_sp<GrMtlTexture> tex;
+    if (renderTarget) {
+        // Enable once we have render target support
+#if 0
+        tex = GrMtlTextureRenderTarget::CreateNewTextureRenderTarget(this, budgeted,
+                                                                    desc, mipLevels);
+#endif
+    } else {
+        tex = GrMtlTexture::CreateNewTexture(this, budgeted, desc, mipLevels);
+    }
+
+    if (!tex) {
+        return nullptr;
+    }
+
+    if (mipLevelCount) {
+        // Perform initial data upload here
+    }
+
+    if (desc.fFlags & kPerformInitialClear_GrSurfaceFlag) {
+        // Do initial clear of the texture
+    }
+    return tex;
+}
diff --git a/src/gpu/mtl/GrMtlTexture.h b/src/gpu/mtl/GrMtlTexture.h
new file mode 100644
index 0000000000..2d3580ef71
--- /dev/null
+++ b/src/gpu/mtl/GrMtlTexture.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrMtlTexture_DEFINED
+#define GrMtlTexture_DEFINED
+
+#include "GrTexture.h"
+
+#import <Metal/Metal.h>
+
+class GrMtlGpu;
+
+class GrMtlTexture : public GrTexture {
+public:
+    static sk_sp<GrMtlTexture> CreateNewTexture(GrMtlGpu*, SkBudgeted budgeted,
+                                                const GrSurfaceDesc&, int mipLevels);
+
+    static sk_sp<GrMtlTexture> MakeWrappedTexture(GrMtlGpu*, const GrSurfaceDesc&,
+                                                  GrWrapOwnership);
+
+    ~GrMtlTexture() override;
+
+    id<MTLTexture> mtlTexture() const { return fTexture; }
+
+    GrBackendObject getTextureHandle() const override;
+
+    void textureParamsModified() override {}
+
+    bool reallocForMipmap(GrMtlGpu* gpu, uint32_t mipLevels);
+
+    void setRelease(GrTexture::ReleaseProc proc, GrTexture::ReleaseCtx ctx) override {
+        // Since all MTLResources are inherently ref counted, we can call the Release proc when we
+        // delete the GrMtlTexture without worry of the MTLTexture getting deleted before it is done
+        // on the GPU.
+        fReleaseProc = proc;
+        fReleaseCtx = ctx;
+    }
+
+protected:
+    GrMtlTexture(GrMtlGpu*, const GrSurfaceDesc&);
+
+    GrMtlGpu* getMtlGpu() const;
+
+    void onAbandon() override {
+        fTexture = nil;
+    }
+    void onRelease() override {
+        fTexture = nil;
+    }
+
+private:
+    enum Wrapped { kWrapped };
+    GrMtlTexture(GrMtlGpu*, SkBudgeted, const GrSurfaceDesc&, id<MTLTexture>, bool isMipMapped);
+   // GrMtlTexture(GrMtlGpu*, Wrapped, const GrSurfaceDesc&, GrMtlImage::Wrapped wrapped);
+
+    id<MTLTexture> fTexture;
+
+    ReleaseProc fReleaseProc = nullptr;
+    ReleaseCtx fReleaseCtx = nullptr;
+
+    typedef GrTexture INHERITED;
+};
+
+#endif
diff --git a/src/gpu/mtl/GrMtlTexture.mm b/src/gpu/mtl/GrMtlTexture.mm
new file mode 100644
index 0000000000..ec7f3b1750
--- /dev/null
+++ b/src/gpu/mtl/GrMtlTexture.mm
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrMtlTexture.h"
+
+#include "GrMtlGpu.h"
+#include "GrMtlUtil.h"
+#include "GrTexturePriv.h"
+
+sk_sp<GrMtlTexture> GrMtlTexture::CreateNewTexture(GrMtlGpu* gpu, SkBudgeted budgeted,
+                                                   const GrSurfaceDesc& desc, int mipLevels) {
+    MTLPixelFormat format;
+    if (!GrPixelConfigToMTLFormat(desc.fConfig, &format)) {
+        return nullptr;
+    }
+
+    MTLTextureDescriptor* descriptor = [[MTLTextureDescriptor alloc] init];
+    descriptor.textureType = MTLTextureType2D;
+    descriptor.pixelFormat = format;
+    descriptor.width = desc.fWidth;
+    descriptor.height = desc.fHeight;
+    descriptor.depth = 1;
+    descriptor.mipmapLevelCount = mipLevels;
+    descriptor.sampleCount = 1;
+    descriptor.arrayLength = 1;
+    // descriptor.resourceOptions This looks to be set by setting cpuCacheMode and storageModes
+    descriptor.cpuCacheMode = MTLCPUCacheModeWriteCombined;
+    // Shared is not available on MacOS. Is there a reason to want managed to allow mapping?
+    descriptor.storageMode = MTLStorageModePrivate;
+
+    MTLTextureUsage texUsage = MTLTextureUsageShaderRead;
+    if (GrMTLFormatIsSRGB(format, nullptr)) {
+        texUsage |= MTLTextureUsagePixelFormatView;
+    }
+    descriptor.usage = texUsage;
+
+    id<MTLTexture> texture = [gpu->device() newTextureWithDescriptor:descriptor];
+
+    return sk_sp<GrMtlTexture>(new GrMtlTexture(gpu, budgeted, desc, texture, mipLevels > 1));
+}
+
+// This method parallels GrTextureProxy::highestFilterMode
+static inline GrSamplerParams::FilterMode highest_filter_mode(GrPixelConfig config) {
+    if (GrPixelConfigIsSint(config)) {
+        // We only ever want to nearest-neighbor sample signed int textures.
+        return GrSamplerParams::kNone_FilterMode;
+    }
+    return GrSamplerParams::kMipMap_FilterMode;
+}
+
+GrMtlTexture::GrMtlTexture(GrMtlGpu* gpu,
+                           SkBudgeted budgeted,
+                           const GrSurfaceDesc& desc,
+                           id<MTLTexture> texture,
+                           bool isMipMapped)
+        : GrSurface(gpu, desc)
+        , INHERITED(gpu, desc, kTexture2DSampler_GrSLType, highest_filter_mode(desc.fConfig),
+                    isMipMapped)
+        , fTexture(texture) {
+}
+
+GrMtlTexture::~GrMtlTexture() {
+    SkASSERT(nil == fTexture);
+}
+
+GrMtlGpu* GrMtlTexture::getMtlGpu() const {
+    SkASSERT(!this->wasDestroyed());
+    return static_cast<GrMtlGpu*>(this->getGpu());
+}
+
+GrBackendObject GrMtlTexture::getTextureHandle() const {
+    void* voidTex = (__bridge_retained void*)fTexture;
+    return (GrBackendObject)voidTex;
+}
diff --git a/src/gpu/mtl/GrMtlUtil.h b/src/gpu/mtl/GrMtlUtil.h
index 78af7bf89f..a84a636511 100644
--- a/src/gpu/mtl/GrMtlUtil.h
+++ b/src/gpu/mtl/GrMtlUtil.h
@@ -22,5 +22,10 @@ bool GrPixelConfigToMTLFormat(GrPixelConfig config, MTLPixelFormat* format);
 */
 GrPixelConfig GrMTLFormatToPixelConfig(MTLPixelFormat format);
 
+/**
+ * Returns true if the given vulkan texture format is sRGB encoded.
+ * Also provides the non-sRGB version, if there is one.
+ */
+bool GrMTLFormatIsSRGB(MTLPixelFormat format, MTLPixelFormat* linearFormat);
 
 #endif
diff --git a/src/gpu/mtl/GrMtlUtil.mm b/src/gpu/mtl/GrMtlUtil.mm
index 9c6e3f0eca..d1bbf6e6bc 100644
--- a/src/gpu/mtl/GrMtlUtil.mm
+++ b/src/gpu/mtl/GrMtlUtil.mm
@@ -101,3 +101,23 @@ GrPixelConfig GrMTLFormatToPixelConfig(MTLPixelFormat format) {
             return kUnknown_GrPixelConfig;
     }
 }
+
+bool GrMTLFormatIsSRGB(MTLPixelFormat format, MTLPixelFormat* linearFormat) {
+    MTLPixelFormat linearFmt = format;
+    switch (format) {
+        case MTLPixelFormatRGBA8Unorm_sRGB:
+            linearFmt = MTLPixelFormatRGBA8Unorm;
+            break;
+        case MTLPixelFormatBGRA8Unorm_sRGB:
+            linearFmt = MTLPixelFormatBGRA8Unorm;
+            break;
+        default:
+            break;
+    }
+
+    if (linearFormat) {
+        *linearFormat = linearFmt;
+    }
+    return (linearFmt != format);
+}
+