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>
runFPTest(skiatest::Reporter * reporter,GrContext * context,T min,T max,T epsilon,T maxInt,int arraySize,GrPixelConfig config)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
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest,reporter,context)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
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatAlphaTextureTest,reporter,context)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
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatRGBATextureTest,reporter,context)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