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Added texture format helper functions.

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This commit is contained in:
bkaradzic 2013-01-04 23:52:37 -08:00
parent 6f3cc509e4
commit 0af002d05f
2 changed files with 55 additions and 4 deletions
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6
include/bgfx.h
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@ -604,6 +604,12 @@ namespace bgfx
/// Destroy program.
void destroyProgram(ProgramHandle _handle);
/// Returns number of bits per pixel.
uint32_t getBitsPerPixel(TextureFormat::Enum _format);
/// Calculate amount of memory required for texture.
uint32_t calcTextureSize(uint16_t _width, uint16_t _height, uint16_t _depth, uint8_t _numMips, TextureFormat::Enum _format);
/// Create texture from memory buffer.
TextureHandle createTexture(const Memory* _mem, uint32_t _flags = BGFX_TEXTURE_NONE, TextureInfo* _info = NULL);

53
src/bgfx.cpp
View file

@ -70,7 +70,7 @@ namespace bgfx
saveTga(_filePath, _width, _height, _pitch, _data, false, _yflip);
}
virtual void captureBegin(uint32_t /*_width*/, uint32_t /*_height*/, uint32_t /*_pitch*/, bgfx::TextureFormat::Enum /*_format*/, bool /*_yflip*/) BX_OVERRIDE
virtual void captureBegin(uint32_t /*_width*/, uint32_t /*_height*/, uint32_t /*_pitch*/, TextureFormat::Enum /*_format*/, bool /*_yflip*/) BX_OVERRIDE
{
BX_TRACE("Warning: using capture without callback (a.k.a. pointless).");
}
@ -893,6 +893,51 @@ namespace bgfx
s_ctx.destroyProgram(_handle);
}
static const uint32_t s_bitsPerPixel[TextureFormat::Count] =
{
4, // Dxt1
4, // Dxt3
4, // Dxt5
0, // Unknown
8, // L8
32, // BGRX8
32, // BGRA8
16, // RGBA16
16, // R5G6B5
16, // RGBA4
16, // RGB5A1
32, // RGB10A2
};
uint32_t getBitsPerPixel(TextureFormat::Enum _format)
{
return s_bitsPerPixel[_format];
}
uint32_t calcTextureSize(uint16_t _width, uint16_t _height, uint16_t _depth, uint8_t _numMips, TextureFormat::Enum _format)
{
uint32_t width = _width;
uint32_t height = _height;
uint32_t depth = _depth;
uint32_t bpp = s_bitsPerPixel[_format];
uint32_t size = 0;
for (uint32_t lod = 0; lod < _numMips; ++lod)
{
width = uint32_max(1, width);
height = uint32_max(1, height);
depth = uint32_max(1, depth);
size += _width*_height*depth*bpp/8;
width >>= 1;
height >>= 1;
depth >>= 1;
}
return size;
}
TextureHandle createTexture(const Memory* _mem, uint32_t _flags, TextureInfo* _info)
{
BGFX_CHECK_MAIN_THREAD();
@ -904,7 +949,7 @@ namespace bgfx
{
BGFX_CHECK_MAIN_THREAD();
uint32_t size = sizeof(uint32_t)+sizeof(TextureCreate);
const bgfx::Memory* mem = alloc(size);
const Memory* mem = alloc(size);
bx::StaticMemoryBlockWriter writer(mem->data, mem->size);
uint32_t magic = BGFX_CHUNK_MAGIC_TEX;
@ -928,7 +973,7 @@ namespace bgfx
{
BGFX_CHECK_MAIN_THREAD();
uint32_t size = sizeof(uint32_t)+sizeof(TextureCreate);
const bgfx::Memory* mem = alloc(size);
const Memory* mem = alloc(size);
bx::StaticMemoryBlockWriter writer(mem->data, mem->size);
uint32_t magic = BGFX_CHUNK_MAGIC_TEX;
@ -952,7 +997,7 @@ namespace bgfx
{
BGFX_CHECK_MAIN_THREAD();
uint32_t size = sizeof(uint32_t)+sizeof(TextureCreate);
const bgfx::Memory* mem = alloc(size);
const Memory* mem = alloc(size);
bx::StaticMemoryBlockWriter writer(mem->data, mem->size);
uint32_t magic = BGFX_CHUNK_MAGIC_TEX;