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#if SK_SUPPORT_GPU
15#include <float.h>
16#include "Test.h"
17#include "GrContext.h"
18#include "GrTexture.h"
19#include "GrContextFactory.h"
20#include "SkGpuDevice.h"
21
22static const int DEV_W = 100, DEV_H = 100;
23static const int FP_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * sizeof(float);
24static const float kMaxIntegerRepresentableInSPFloatingPoint = 16777216;  // 2 ^ 24
25
26static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
27
28DEF_GPUTEST(FloatingPointTextureTest, reporter, factory) {
29    float controlPixelData[FP_CONTROL_ARRAY_SIZE];
30    float readBuffer[FP_CONTROL_ARRAY_SIZE];
31    for (int i = 0; i < FP_CONTROL_ARRAY_SIZE; i += 4) {
32        controlPixelData[i] = FLT_MIN;
33        controlPixelData[i + 1] = FLT_MAX;
34        controlPixelData[i + 2] = FLT_EPSILON;
35        controlPixelData[i + 3] = kMaxIntegerRepresentableInSPFloatingPoint;
36    }
37
38    for (int origin = 0; origin < 2; ++origin) {
39        int glCtxTypeCnt = 1;
40        glCtxTypeCnt = GrContextFactory::kGLContextTypeCnt;
41        for (int glCtxType = 0; glCtxType < glCtxTypeCnt; ++glCtxType) {
42            GrTextureDesc desc;
43            desc.fFlags = kRenderTarget_GrTextureFlagBit;
44            desc.fWidth = DEV_W;
45            desc.fHeight = DEV_H;
46            desc.fConfig = kRGBA_float_GrPixelConfig;
47            desc.fOrigin = 0 == origin ?
48                kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
49
50            GrContext* context = NULL;
51            GrContextFactory::GLContextType type =
52                    static_cast<GrContextFactory::GLContextType>(glCtxType);
53            if (!GrContextFactory::IsRenderingGLContext(type)) {
54                continue;
55            }
56            context = factory->get(type);
57            if (NULL == context){
58                continue;
59            }
60
61            SkAutoTUnref<GrTexture> fpTexture(context->createUncachedTexture(desc,
62                                                                             NULL,
63                                                                             0));
64
65            // Floating point textures are NOT supported everywhere
66            if (NULL == fpTexture) {
67                continue;
68            }
69
70            // write square
71            context->writeTexturePixels(fpTexture, 0, 0, DEV_W, DEV_H, desc.fConfig,
72                    controlPixelData, 0);
73            context->readTexturePixels(fpTexture, 0, 0, DEV_W, DEV_H, desc.fConfig, readBuffer, 0);
74            for (int j = 0; j < FP_CONTROL_ARRAY_SIZE; ++j) {
75                REPORTER_ASSERT(reporter, readBuffer[j] == controlPixelData[j]);
76            }
77        }
78    }
79}
80
81#endif
82