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Added imageRgba8Downsample2x2 utility function and updated 07-callback to demonstrate how to use it to generate mip maps.

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bkaradzic
2013-08-21 22:51:24 -07:00
parent fe92ee4b9a
commit 333ff8500d
6 changed files with 303 additions and 74 deletions
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61
examples/07-callback/callback.cpp
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@@ -219,8 +219,65 @@ struct BgfxCallback : public bgfx::CallbackI
virtual void screenShot(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _pitch, const void* _data, uint32_t /*_size*/, bool _yflip) BX_OVERRIDE
{
char temp[1024];
// Save screen shot as TGA.
saveTga(_filePath, _width, _height, _pitch, _data, false, _yflip);
bx::snprintf(temp, BX_COUNTOF(temp), "%s.mip0.tga", _filePath);
saveTga(temp, _width, _height, _pitch, _data, false, _yflip);
uint32_t width = _width;
uint32_t height = _height;
uint32_t pitch = _pitch;
uint8_t* data = (uint8_t*)_data;
// Generate mip maps.
uint32_t mip = 1;
for (; 2 <= width && 2 <= height; ++mip)
{
bx::snprintf(temp, BX_COUNTOF(temp), "%s.mip%d.tga", _filePath, mip);
bgfx::imageRgba8Downsample2x2(width, height, pitch, data, data);
width >>= 1;
height >>= 1;
pitch = width*4;
saveTga(temp, width, height, pitch, _data, false, _yflip);
}
if (width > height)
{
for (; 2 <= width; ++mip)
{
memcpy(&data[width*4], data, width*4);
bx::snprintf(temp, BX_COUNTOF(temp), "%s.mip%d.tga", _filePath, mip);
bgfx::imageRgba8Downsample2x2(width, 2, pitch, data, data);
width >>= 1;
pitch = width*4;
saveTga(temp, width, 2, pitch, _data, false, _yflip);
}
}
else
{
for (; 2 <= height; ++mip)
{
uint32_t* src = (uint32_t*)data;
for (uint32_t ii = 0; ii < height; ++ii, src += 2)
{
src[1] = src[0];
}
bx::snprintf(temp, BX_COUNTOF(temp), "%s.mip%d.tga", _filePath, mip);
bgfx::imageRgba8Downsample2x2(2, height, 8, data, data);
height >>= 1;
saveTga(temp, 2, height, 8, _data, false, _yflip);
}
}
}
virtual void captureBegin(uint32_t _width, uint32_t _height, uint32_t /*_pitch*/, bgfx::TextureFormat::Enum /*_format*/, bool _yflip) BX_OVERRIDE
@@ -403,7 +460,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
// Take screen shot at frame 150.
if (150 == frame)
{
bgfx::saveScreenShot("temp/frame150.tga");
bgfx::saveScreenShot("temp/frame150");
}
// Advance to next frame. Rendering thread will be kicked to