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 "GrContextPriv.h"
21#include "GrProxyProvider.h"
22#include "GrTextureProxy.h"
23#include "SkHalf.h"
24
25static const int DEV_W = 100, DEV_H = 100;
26
27template <typename T>
28void 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    GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
37    SkTDArray<T> controlPixelData, readBuffer;
38    controlPixelData.setCount(arraySize);
39    readBuffer.setCount(arraySize);
40
41    for (int i = 0; i < arraySize; i += 4) {
42        controlPixelData[i + 0] = min;
43        controlPixelData[i + 1] = max;
44        controlPixelData[i + 2] = epsilon;
45        controlPixelData[i + 3] = maxInt;
46    }
47
48    for (int origin = 0; origin < 2; ++origin) {
49        GrSurfaceDesc desc;
50        desc.fFlags = kRenderTarget_GrSurfaceFlag;
51        desc.fOrigin = 0 == origin ? kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
52        desc.fWidth = DEV_W;
53        desc.fHeight = DEV_H;
54        desc.fConfig = config;
55
56        sk_sp<GrTextureProxy> fpProxy = proxyProvider->createTextureProxy(
57                                           desc, SkBudgeted::kNo, controlPixelData.begin(), 0);
58        // Floating point textures are NOT supported everywhere
59        if (!fpProxy) {
60            continue;
61        }
62
63        sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
64                                                                            std::move(fpProxy));
65        REPORTER_ASSERT(reporter, sContext);
66
67        bool result = context->contextPriv().readSurfacePixels(sContext.get(),
68                                                               0, 0, DEV_W, DEV_H,
69                                                               desc.fConfig, nullptr,
70                                                               readBuffer.begin(), 0);
71        REPORTER_ASSERT(reporter, result);
72        REPORTER_ASSERT(reporter,
73                        0 == memcmp(readBuffer.begin(), controlPixelData.begin(), readBuffer.bytes()));
74    }
75}
76
77static const int RGBA32F_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4;
78static const float kMaxIntegerRepresentableInSPFloatingPoint = 16777216;  // 2 ^ 24
79
80DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest, reporter, ctxInfo) {
81    runFPTest<float>(reporter, ctxInfo.grContext(), FLT_MIN, FLT_MAX, FLT_EPSILON,
82                     kMaxIntegerRepresentableInSPFloatingPoint,
83                     RGBA32F_CONTROL_ARRAY_SIZE, kRGBA_float_GrPixelConfig);
84}
85
86static const int RG32F_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 2;
87
88DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest_RG, reporter, ctxInfo) {
89    runFPTest<float>(reporter, ctxInfo.grContext(), FLT_MIN, FLT_MAX, FLT_EPSILON,
90                     kMaxIntegerRepresentableInSPFloatingPoint,
91                     RG32F_CONTROL_ARRAY_SIZE, kRG_float_GrPixelConfig);
92}
93
94static const int HALF_ALPHA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 1 /*alpha-only*/;
95static const SkHalf kMaxIntegerRepresentableInHalfFloatingPoint = 0x6800;  // 2 ^ 11
96
97DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatAlphaTextureTest, reporter, ctxInfo) {
98    runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
99        kMaxIntegerRepresentableInHalfFloatingPoint,
100        HALF_ALPHA_CONTROL_ARRAY_SIZE, kAlpha_half_GrPixelConfig);
101}
102
103static const int HALF_RGBA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4 /*RGBA*/;
104
105DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatRGBATextureTest, reporter, ctxInfo) {
106    runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
107        kMaxIntegerRepresentableInHalfFloatingPoint,
108        HALF_RGBA_CONTROL_ARRAY_SIZE, kRGBA_half_GrPixelConfig);
109}
110
111#endif
112