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#include "color.hpp"
#include <algorithm>
#include <array>
namespace SceneUtil
{
bool isColorFormat(GLenum format)
{
static constexpr std::array<GLenum, 42> formats = {
GL_RGB,
GL_RGB4,
GL_RGB5,
GL_RGB8,
GL_RGB8_SNORM,
GL_RGB10,
GL_RGB12,
GL_RGB16,
GL_RGB16_SNORM,
GL_SRGB,
GL_SRGB8,
GL_RGB16F,
GL_RGB32F,
GL_R11F_G11F_B10F,
GL_RGB9_E5,
GL_RGB8I,
GL_RGB8UI,
GL_RGB16I,
GL_RGB16UI,
GL_RGB32I,
GL_RGB32UI,
GL_RGBA,
GL_RGBA2,
GL_RGBA4,
GL_RGB5_A1,
GL_RGBA8,
GL_RGBA8_SNORM,
GL_RGB10_A2,
GL_RGB10_A2UI,
GL_RGBA12,
GL_RGBA16,
GL_RGBA16_SNORM,
GL_SRGB_ALPHA8,
GL_SRGB8_ALPHA8,
GL_RGBA16F,
GL_RGBA32F,
GL_RGBA8I,
GL_RGBA8UI,
GL_RGBA16I,
GL_RGBA16UI,
GL_RGBA32I,
GL_RGBA32UI,
};
return std::find(formats.cbegin(), formats.cend(), format) != formats.cend();
}
bool isFloatingPointColorFormat(GLenum format)
{
static constexpr std::array<GLenum, 5> formats = {
GL_RGB16F,
GL_RGB32F,
GL_R11F_G11F_B10F,
GL_RGBA16F,
GL_RGBA32F,
};
return std::find(formats.cbegin(), formats.cend(), format) != formats.cend();
}
int getColorFormatChannelCount(GLenum format)
{
static constexpr std::array<GLenum, 21> formats = {
GL_RGBA,
GL_RGBA2,
GL_RGBA4,
GL_RGB5_A1,
GL_RGBA8,
GL_RGBA8_SNORM,
GL_RGB10_A2,
GL_RGB10_A2UI,
GL_RGBA12,
GL_RGBA16,
GL_RGBA16_SNORM,
GL_SRGB_ALPHA8,
GL_SRGB8_ALPHA8,
GL_RGBA16F,
GL_RGBA32F,
GL_RGBA8I,
GL_RGBA8UI,
GL_RGBA16I,
GL_RGBA16UI,
GL_RGBA32I,
GL_RGBA32UI,
};
if (std::find(formats.cbegin(), formats.cend(), format) != formats.cend())
return 4;
return 3;
}
void getColorFormatSourceFormatAndType(GLenum internalFormat, GLenum& sourceFormat, GLenum& sourceType)
{
if (getColorFormatChannelCount(internalFormat == 4))
sourceFormat = GL_RGBA;
else
sourceFormat = GL_RGB;
if (isFloatingPointColorFormat(internalFormat))
sourceType = GL_FLOAT;
else
sourceType = GL_UNSIGNED_BYTE;
}
namespace Color
{
GLenum sColorInternalFormat;
GLenum sColorSourceFormat;
GLenum sColorSourceType;
GLenum colorInternalFormat()
{
return sColorInternalFormat;
}
GLenum colorSourceFormat()
{
return sColorSourceFormat;
}
GLenum colorSourceType()
{
return sColorSourceType;
}
void SelectColorFormatOperation::operator()([[maybe_unused]] osg::GraphicsContext* graphicsContext)
{
sColorInternalFormat = GL_RGB;
for (auto supportedFormat : mSupportedFormats)
{
if (isColorFormat(supportedFormat))
{
sColorInternalFormat = supportedFormat;
break;
}
}
getColorFormatSourceFormatAndType(sColorInternalFormat, sColorSourceFormat, sColorSourceType);
}
}
}
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