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robertphillips@google.com69950682012-04-06 18:06:10 +00001
2/*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
bsalomon@google.comcf8fb1f2012-08-02 14:03:32 +00009// This test is specific to the GPU backend.
djsollen@google.comefbe8e92013-02-07 18:58:35 +000010#if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
bsalomon@google.comcf8fb1f2012-08-02 14:03:32 +000011
robertphillips@google.com69950682012-04-06 18:06:10 +000012#include "Test.h"
13#include "SkGpuDevice.h"
bsalomon@google.com67b915d2013-02-04 16:13:32 +000014#include "GrContextFactory.h"
robertphillips@google.com69950682012-04-06 18:06:10 +000015
16static const int X_SIZE = 12;
17static const int Y_SIZE = 12;
18
bsalomon@google.com67b915d2013-02-04 16:13:32 +000019static void ReadWriteAlphaTest(skiatest::Reporter* reporter, GrContextFactory* factory) {
20 for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
21 GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
22 if (!GrContextFactory::IsRenderingGLContext(glType)) {
23 continue;
robertphillips@google.com69950682012-04-06 18:06:10 +000024 }
bsalomon@google.com67b915d2013-02-04 16:13:32 +000025 GrContext* context = factory->get(glType);
26 if (NULL == context) {
27 continue;
28 }
robertphillips@google.com69950682012-04-06 18:06:10 +000029
bsalomon@google.com67b915d2013-02-04 16:13:32 +000030 unsigned char textureData[X_SIZE][Y_SIZE];
robertphillips@google.com69950682012-04-06 18:06:10 +000031
bsalomon@google.com67b915d2013-02-04 16:13:32 +000032 memset(textureData, 0, X_SIZE * Y_SIZE);
robertphillips@google.com69950682012-04-06 18:06:10 +000033
bsalomon@google.com67b915d2013-02-04 16:13:32 +000034 GrTextureDesc desc;
robertphillips@google.com69950682012-04-06 18:06:10 +000035
bsalomon@google.com67b915d2013-02-04 16:13:32 +000036 // let Skia know we will be using this texture as a render target
37 desc.fFlags = kRenderTarget_GrTextureFlagBit;
38 // it is a single channel texture
39 desc.fConfig = kAlpha_8_GrPixelConfig;
40 desc.fWidth = X_SIZE;
41 desc.fHeight = Y_SIZE;
robertphillips@google.com69950682012-04-06 18:06:10 +000042
bsalomon@google.com67b915d2013-02-04 16:13:32 +000043 // We are initializing the texture with zeros here
44 GrTexture* texture = context->createUncachedTexture(desc, textureData, 0);
45 if (!texture) {
46 return;
47 }
robertphillips@google.com69950682012-04-06 18:06:10 +000048
bsalomon@google.com67b915d2013-02-04 16:13:32 +000049 GrAutoUnref au(texture);
50
51 // create a distinctive texture
52 for (int y = 0; y < Y_SIZE; ++y) {
53 for (int x = 0; x < X_SIZE; ++x) {
54 textureData[x][y] = x*Y_SIZE+y;
robertphillips@google.com69950682012-04-06 18:06:10 +000055 }
56 }
robertphillips@google.com69950682012-04-06 18:06:10 +000057
bsalomon@google.com67b915d2013-02-04 16:13:32 +000058 // upload the texture
59 texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
60 textureData, 0);
robertphillips@google.com69950682012-04-06 18:06:10 +000061
bsalomon@google.com67b915d2013-02-04 16:13:32 +000062 unsigned char readback[X_SIZE][Y_SIZE];
robertphillips@google.com69950682012-04-06 18:06:10 +000063
bsalomon@google.com67b915d2013-02-04 16:13:32 +000064 // clear readback to something non-zero so we can detect readback failures
65 memset(readback, 0x1, X_SIZE * Y_SIZE);
robertphillips@google.com69950682012-04-06 18:06:10 +000066
bsalomon@google.com67b915d2013-02-04 16:13:32 +000067 // read the texture back
68 texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
69 readback, 0);
robertphillips@google.com69950682012-04-06 18:06:10 +000070
bsalomon@google.com67b915d2013-02-04 16:13:32 +000071 // make sure the original & read back versions match
72 bool match = true;
robertphillips@google.com69950682012-04-06 18:06:10 +000073
bsalomon@google.com67b915d2013-02-04 16:13:32 +000074 for (int y = 0; y < Y_SIZE; ++y) {
75 for (int x = 0; x < X_SIZE; ++x) {
76 if (textureData[x][y] != readback[x][y]) {
77 match = false;
78 }
robertphillips@google.com69950682012-04-06 18:06:10 +000079 }
80 }
robertphillips@google.com69950682012-04-06 18:06:10 +000081
bsalomon@google.com67b915d2013-02-04 16:13:32 +000082 REPORTER_ASSERT(reporter, match);
83
84 // Now try writing on the single channel texture
85 SkAutoTUnref<SkDevice> device(new SkGpuDevice(context, texture->asRenderTarget()));
86 SkCanvas canvas(device);
87
88 SkPaint paint;
89
90 const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
91
92 paint.setColor(SK_ColorWHITE);
93
94 canvas.drawRect(rect, paint);
95
96 texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
97 readback, 0);
98
99 match = true;
100
101 for (int y = 0; y < Y_SIZE; ++y) {
102 for (int x = 0; x < X_SIZE; ++x) {
103 if (0xFF != readback[x][y]) {
104 match = false;
105 }
106 }
107 }
108
109 REPORTER_ASSERT(reporter, match);
110 }
robertphillips@google.com69950682012-04-06 18:06:10 +0000111}
112
113#include "TestClassDef.h"
114DEFINE_GPUTESTCLASS("ReadWriteAlpha", ReadWriteAlphaTestClass, ReadWriteAlphaTest)
115
bsalomon@google.comcf8fb1f2012-08-02 14:03:32 +0000116#endif