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Remove use of unportable fls() function from multisampling.cpp.

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This commit is contained in:
Bill Hollings 2017-06-22 17:55:57 -04:00
parent bc8c47bd62
commit 34ede255a9
1 changed files with 12 additions and 7 deletions
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19
multisampling/multisampling.cpp
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@ -8,7 +8,6 @@
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <assert.h>
#include <vector>
#include <algorithm>
@ -694,7 +693,7 @@ public:
void prepare()
{
setSampleCount();
sampleCount = getMaxUsableSampleCount();
VulkanExampleBase::prepare();
loadAssets();
setupVertexDescriptions();
@ -736,13 +735,19 @@ public:
}
}
// Determine the maximum sample count usable by the platform
void setSampleCount()
// Returns the maximum sample count usable by the platform
VkSampleCountFlagBits getMaxUsableSampleCount()
{
VkSampleCountFlags flags = std::min(deviceProperties.limits.framebufferColorSampleCounts,
VkSampleCountFlags counts = std::min(deviceProperties.limits.framebufferColorSampleCounts,
deviceProperties.limits.framebufferDepthSampleCounts);
// Extract the value of the high-order bit of the flags
sampleCount = (VkSampleCountFlagBits)(flags ? (1 << (fls(flags) - 1)) : 0);
if (counts & VK_SAMPLE_COUNT_64_BIT) { return VK_SAMPLE_COUNT_64_BIT; }
if (counts & VK_SAMPLE_COUNT_32_BIT) { return VK_SAMPLE_COUNT_32_BIT; }
if (counts & VK_SAMPLE_COUNT_16_BIT) { return VK_SAMPLE_COUNT_16_BIT; }
if (counts & VK_SAMPLE_COUNT_8_BIT) { return VK_SAMPLE_COUNT_8_BIT; }
if (counts & VK_SAMPLE_COUNT_4_BIT) { return VK_SAMPLE_COUNT_4_BIT; }
if (counts & VK_SAMPLE_COUNT_2_BIT) { return VK_SAMPLE_COUNT_2_BIT; }
return VK_SAMPLE_COUNT_1_BIT;
}
};