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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 "GrTexture.h"
     21 #include "SkHalf.h"
     22 
     23 static const int DEV_W = 100, DEV_H = 100;
     24 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
     25 
     26 template <typename T>
     27 void runFPTest(skiatest::Reporter* reporter, GrContext* context,
     28                T min, T max, T epsilon, T maxInt, int arraySize, GrPixelConfig config) {
     29     SkTDArray<T> controlPixelData, readBuffer;
     30     controlPixelData.setCount(arraySize);
     31     readBuffer.setCount(arraySize);
     32 
     33     for (int i = 0; i < arraySize; i += 4) {
     34         controlPixelData[i + 0] = min;
     35         controlPixelData[i + 1] = max;
     36         controlPixelData[i + 2] = epsilon;
     37         controlPixelData[i + 3] = maxInt;
     38     }
     39 
     40     for (int origin = 0; origin < 2; ++origin) {
     41         GrSurfaceDesc desc;
     42         desc.fFlags = kRenderTarget_GrSurfaceFlag;
     43         desc.fWidth = DEV_W;
     44         desc.fHeight = DEV_H;
     45         desc.fConfig = config;
     46         desc.fOrigin = 0 == origin ?
     47             kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
     48         SkAutoTUnref<GrTexture> fpTexture(context->textureProvider()->createTexture(
     49             desc, SkBudgeted::kNo, controlPixelData.begin(), 0));
     50         // Floating point textures are NOT supported everywhere
     51         if (nullptr == fpTexture) {
     52             continue;
     53         }
     54         fpTexture->readPixels(0, 0, DEV_W, DEV_H, desc.fConfig, readBuffer.begin(), 0);
     55         REPORTER_ASSERT(reporter,
     56                         0 == memcmp(readBuffer.begin(), controlPixelData.begin(), readBuffer.bytes()));
     57     }
     58 }
     59 
     60 static const int FP_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4/*RGBA*/;
     61 static const float kMaxIntegerRepresentableInSPFloatingPoint = 16777216;  // 2 ^ 24
     62 
     63 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest, reporter, context) {
     64     runFPTest<float>(reporter, context, FLT_MIN, FLT_MAX, FLT_EPSILON,
     65                      kMaxIntegerRepresentableInSPFloatingPoint,
     66                      FP_CONTROL_ARRAY_SIZE, kRGBA_float_GrPixelConfig);
     67 }
     68 
     69 static const int HALF_ALPHA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 1 /*alpha-only*/;
     70 static const SkHalf kMaxIntegerRepresentableInHalfFloatingPoint = 0x6800;  // 2 ^ 11
     71 
     72 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatAlphaTextureTest, reporter, context) {
     73     runFPTest<SkHalf>(reporter, context, SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
     74         kMaxIntegerRepresentableInHalfFloatingPoint,
     75         HALF_ALPHA_CONTROL_ARRAY_SIZE, kAlpha_half_GrPixelConfig);
     76 }
     77 
     78 static const int HALF_RGBA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4 /*RGBA*/;
     79 
     80 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatRGBATextureTest, reporter, context) {
     81     runFPTest<SkHalf>(reporter, context, SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
     82         kMaxIntegerRepresentableInHalfFloatingPoint,
     83         HALF_RGBA_CONTROL_ARRAY_SIZE, kRGBA_half_GrPixelConfig);
     84 }
     85 
     86 #endif
     87