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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* This is a straightforward test of floating point textures, which are
* supported on some platforms. As of right now, this test only supports
* 32 bit floating point textures, and indeed floating point test values
* have been selected to require 32 bits of precision and full IEEE conformance
*/
#include <float.h>
#include "Test.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrTexture.h"
#include "SkHalf.h"
static const int DEV_W = 100, DEV_H = 100;
static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
template <typename T>
void runFPTest(skiatest::Reporter* reporter, GrContext* context,
T min, T max, T epsilon, T maxInt, int arraySize, GrPixelConfig config) {
SkTDArray<T> controlPixelData, readBuffer;
controlPixelData.setCount(arraySize);
readBuffer.setCount(arraySize);
for (int i = 0; i < arraySize; i += 4) {
controlPixelData[i + 0] = min;
controlPixelData[i + 1] = max;
controlPixelData[i + 2] = epsilon;
controlPixelData[i + 3] = maxInt;
}
for (int origin = 0; origin < 2; ++origin) {
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = DEV_W;
desc.fHeight = DEV_H;
desc.fConfig = config;
desc.fOrigin = 0 == origin ?
kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
SkAutoTUnref<GrTexture> fpTexture(context->textureProvider()->createTexture(
desc, SkBudgeted::kNo, controlPixelData.begin(), 0));
// Floating point textures are NOT supported everywhere
if (nullptr == fpTexture) {
continue;
}
fpTexture->readPixels(0, 0, DEV_W, DEV_H, desc.fConfig, readBuffer.begin(), 0);
REPORTER_ASSERT(reporter,
0 == memcmp(readBuffer.begin(), controlPixelData.begin(), readBuffer.bytes()));
}
}
static const int FP_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4/*RGBA*/;
static const float kMaxIntegerRepresentableInSPFloatingPoint = 16777216; // 2 ^ 24
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FloatingPointTextureTest, reporter, ctxInfo) {
runFPTest<float>(reporter, ctxInfo.grContext(), FLT_MIN, FLT_MAX, FLT_EPSILON,
kMaxIntegerRepresentableInSPFloatingPoint,
FP_CONTROL_ARRAY_SIZE, kRGBA_float_GrPixelConfig);
}
static const int HALF_ALPHA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 1 /*alpha-only*/;
static const SkHalf kMaxIntegerRepresentableInHalfFloatingPoint = 0x6800; // 2 ^ 11
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatAlphaTextureTest, reporter, ctxInfo) {
runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
kMaxIntegerRepresentableInHalfFloatingPoint,
HALF_ALPHA_CONTROL_ARRAY_SIZE, kAlpha_half_GrPixelConfig);
}
static const int HALF_RGBA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4 /*RGBA*/;
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(HalfFloatRGBATextureTest, reporter, ctxInfo) {
runFPTest<SkHalf>(reporter, ctxInfo.grContext(), SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
kMaxIntegerRepresentableInHalfFloatingPoint,
HALF_RGBA_CONTROL_ARRAY_SIZE, kRGBA_half_GrPixelConfig);
}
#endif
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