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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrVkSampler.h"
#include "GrVkGpu.h"
static inline VkSamplerAddressMode wrap_mode_to_vk_sampler_address(
GrSamplerState::WrapMode wrapMode) {
switch (wrapMode) {
case GrSamplerState::WrapMode::kClamp:
return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
case GrSamplerState::WrapMode::kRepeat:
return VK_SAMPLER_ADDRESS_MODE_REPEAT;
case GrSamplerState::WrapMode::kMirrorRepeat:
return VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT;
}
SK_ABORT("Unknown wrap mode.");
return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
}
GrVkSampler* GrVkSampler::Create(const GrVkGpu* gpu, const GrSamplerState& samplerState,
uint32_t maxMipLevel) {
static VkFilter vkMinFilterModes[] = {
VK_FILTER_NEAREST,
VK_FILTER_LINEAR,
VK_FILTER_LINEAR
};
static VkFilter vkMagFilterModes[] = {
VK_FILTER_NEAREST,
VK_FILTER_LINEAR,
VK_FILTER_LINEAR
};
VkSamplerCreateInfo createInfo;
memset(&createInfo, 0, sizeof(VkSamplerCreateInfo));
createInfo.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
createInfo.pNext = 0;
createInfo.flags = 0;
createInfo.magFilter = vkMagFilterModes[static_cast<int>(samplerState.filter())];
createInfo.minFilter = vkMinFilterModes[static_cast<int>(samplerState.filter())];
createInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
createInfo.addressModeU = wrap_mode_to_vk_sampler_address(samplerState.wrapModeX());
createInfo.addressModeV = wrap_mode_to_vk_sampler_address(samplerState.wrapModeY());
createInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE; // Shouldn't matter
createInfo.mipLodBias = 0.0f;
createInfo.anisotropyEnable = VK_FALSE;
createInfo.maxAnisotropy = 1.0f;
createInfo.compareEnable = VK_FALSE;
createInfo.compareOp = VK_COMPARE_OP_NEVER;
// Vulkan doesn't have a direct mapping of GL's nearest or linear filters for minFilter since
// there is always a mipmapMode. To get the same effect as GL we can set minLod = maxLod = 0.0.
// This works since our min and mag filters are the same (this forces us to use mag on the 0
// level mip). If the filters weren't the same we could set min = 0 and max = 0.25 to force
// the minFilter on mip level 0.
createInfo.minLod = 0.0f;
bool useMipMaps = GrSamplerState::Filter::kMipMap == samplerState.filter() && maxMipLevel > 0;
createInfo.maxLod = !useMipMaps ? 0.0f : (float)(maxMipLevel);
createInfo.borderColor = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK;
createInfo.unnormalizedCoordinates = VK_FALSE;
VkSampler sampler;
GR_VK_CALL_ERRCHECK(gpu->vkInterface(), CreateSampler(gpu->device(),
&createInfo,
nullptr,
&sampler));
return new GrVkSampler(sampler, GenerateKey(samplerState, maxMipLevel));
}
void GrVkSampler::freeGPUData(const GrVkGpu* gpu) const {
SkASSERT(fSampler);
GR_VK_CALL(gpu->vkInterface(), DestroySampler(gpu->device(), fSampler, nullptr));
}
uint16_t GrVkSampler::GenerateKey(const GrSamplerState& samplerState, uint32_t maxMipLevel) {
const int kTileModeXShift = 2;
const int kTileModeYShift = 4;
const int kMipLevelShift = 6;
SkASSERT(static_cast<int>(samplerState.filter()) <= 3);
uint16_t key = static_cast<uint16_t>(samplerState.filter());
SkASSERT(static_cast<int>(samplerState.wrapModeX()) <= 4);
key |= (static_cast<uint16_t>(samplerState.wrapModeX()) << kTileModeXShift);
SkASSERT(static_cast<int>(samplerState.wrapModeY()) <= 4);
key |= (static_cast<uint16_t>(samplerState.wrapModeY()) << kTileModeYShift);
SkASSERT(maxMipLevel < 1024);
key |= (maxMipLevel << kMipLevelShift);
return key;
}
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