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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 /*
      9  * This is a straightforward test of floating point textures, which are
     10  * supported on some platforms.  As of right now, this test only supports
     11  * 32 bit floating point textures, and indeed floating point test values
     12  * have been selected to require 32 bits of precision and full IEEE conformance
     13  */
     14 
     15 #include <float.h>
     16 #include "Test.h"
     17 
     18 #if SK_SUPPORT_GPU
     19 #include "GrContext.h"
     20 #include "GrResourceProvider.h"
     21 #include "GrTexture.h"
     22 #include "SkHalf.h"
     23 
     24 static const int DEV_W = 100, DEV_H = 100;
     25 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
     26 
     27 template <typename T>
     28 void runFPTest(skiatest::Reporter* reporter, GrContext* context,
     29                T min, T max, T epsilon, T maxInt, int arraySize, GrPixelConfig config) {
     30     if (0 != arraySize % 4) {
     31         REPORT_FAILURE(reporter, "(0 != arraySize % 4)",
     32                        SkString("arraySize must be divisible by 4."));
     33         return;
     34     }
     35 
     36     SkTDArray<T> controlPixelData, readBuffer;
     37     controlPixelData.setCount(arraySize);
     38     readBuffer.setCount(arraySize);
     39 
     40     for (int i = 0; i < arraySize; i += 4) {
     41         controlPixelData[i + 0] = min;
     42         controlPixelData[i + 1] = max;
     43         controlPixelData[i + 2] = epsilon;
     44         controlPixelData[i + 3] = maxInt;
     45     }
     46 
     47     for (int origin = 0; origin < 2; ++origin) {
     48         GrSurfaceDesc desc;
     49         desc.fFlags = kRenderTarget_GrSurfaceFlag;
     50         desc.fWidth = DEV_W;
     51         desc.fHeight = DEV_H;
     52         desc.fConfig = config;
     53         desc.fOrigin = 0 == origin ? kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
     54         sk_sp<GrTexture> fpTexture(context->resourceProvider()->createTexture(
     55             desc, SkBudgeted::kNo, controlPixelData.begin(), 0));
     56         // Floating point textures are NOT supported everywhere
     57         if (nullptr == fpTexture) {
     58             continue;
     59         }
     60         REPORTER_ASSERT(reporter,
     61                         fpTexture->readPixels(0, 0, DEV_W, DEV_H, desc.fConfig, readBuffer.begin(), 0));
     62         REPORTER_ASSERT(reporter,
     63                         0 == memcmp(readBuffer.begin(), controlPixelData.begin(), readBuffer.bytes()));
     64     }
     65 }
     66 
     67 static const int RGBA32F_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4;
     68 static const float kMaxIntegerRepresentableInSPFloatingPoint = 16777216;  // 2 ^ 24
     69 
     70 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest, reporter, ctxInfo) {
     71     runFPTest<float>(reporter, ctxInfo.grContext(), FLT_MIN, FLT_MAX, FLT_EPSILON,
     72                      kMaxIntegerRepresentableInSPFloatingPoint,
     73                      RGBA32F_CONTROL_ARRAY_SIZE, kRGBA_float_GrPixelConfig);
     74 }
     75 
     76 static const int RG32F_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 2;
     77 
     78 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest_RG, reporter, ctxInfo) {
     79     runFPTest<float>(reporter, ctxInfo.grContext(), FLT_MIN, FLT_MAX, FLT_EPSILON,
     80                      kMaxIntegerRepresentableInSPFloatingPoint,
     81                      RG32F_CONTROL_ARRAY_SIZE, kRG_float_GrPixelConfig);
     82 }
     83 
     84 static const int HALF_ALPHA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 1 /*alpha-only*/;
     85 static const SkHalf kMaxIntegerRepresentableInHalfFloatingPoint = 0x6800;  // 2 ^ 11
     86 
     87 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatAlphaTextureTest, reporter, ctxInfo) {
     88     runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
     89         kMaxIntegerRepresentableInHalfFloatingPoint,
     90         HALF_ALPHA_CONTROL_ARRAY_SIZE, kAlpha_half_GrPixelConfig);
     91 }
     92 
     93 static const int HALF_RGBA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4 /*RGBA*/;
     94 
     95 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatRGBATextureTest, reporter, ctxInfo) {
     96     runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
     97         kMaxIntegerRepresentableInHalfFloatingPoint,
     98         HALF_RGBA_CONTROL_ARRAY_SIZE, kRGBA_half_GrPixelConfig);
     99 }
    100 
    101 #endif
    102