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#include <mbgl/gl/context.hpp>
#include <mbgl/gl/texture_resource.hpp>
namespace mbgl {
namespace gl {
static int channelCount(gfx::TexturePixelType format) {
switch (format) {
case gfx::TexturePixelType::Alpha:
case gfx::TexturePixelType::Depth:
case gfx::TexturePixelType::Luminance:
case gfx::TexturePixelType::Stencil:
return 1;
case gfx::TexturePixelType::RGBA:
return 4;
default:
assert(!"Unknown texture pixel type");
return 0;
}
}
static int channelStorageSize(gfx::TextureChannelDataType type) {
switch (type) {
case gfx::TextureChannelDataType::HalfFloat:
return 2;
case gfx::TextureChannelDataType::UnsignedByte:
return 1;
default:
assert(!"Unknown texture channel data type");
return 0;
}
}
TextureResource::~TextureResource() {
auto& stats = texture.get_deleter().context->renderingStats();
stats.memTextures -= byteSize;
assert(stats.memTextures >= 0);
}
int TextureResource::getStorageSize(const Size& size, gfx::TexturePixelType format, gfx::TextureChannelDataType type) {
return size.width * size.height * channelCount(format) * channelStorageSize(type);
}
} // namespace gl
} // namespace mbgl
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