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metal: Implement SDL_LockTexture for YUV formats.

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This commit is contained in:
Alex Szpakowski 2018-12-19 18:27:21 -04:00
parent ce8c716ada
commit c7db6ade7d
1 changed files with 53 additions and 5 deletions
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58
src/render/metal/SDL_render_metal.m
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@ -789,16 +789,22 @@ METAL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
int buffersize = 0;
if (texturedata.yuv || texturedata.nv12) {
/* FIXME: write me */
return SDL_Unsupported();
if (rect->w <= 0 || rect->h <= 0) {
return SDL_SetError("Invalid rectangle dimensions for LockTexture.");
}
*pitch = SDL_BYTESPERPIXEL(texture->format) * rect->w;
if (texturedata.yuv || texturedata.nv12) {
buffersize = ((*pitch) * rect->h) + (2 * (*pitch + 1) / 2) * ((rect->h + 1) / 2);
} else {
buffersize = (*pitch) * rect->h;
}
texturedata.lockedrect = *rect;
texturedata.lockedbuffer = [data.mtldevice newBufferWithLength:(*pitch)*rect->h options:MTLResourceStorageModeShared];
texturedata.lockedbuffer = [data.mtldevice newBufferWithLength:buffersize options:MTLResourceStorageModeShared];
if (texturedata.lockedbuffer == nil) {
return SDL_OutOfMemory();
}
@ -814,6 +820,8 @@ METAL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
SDL_Rect rect = texturedata.lockedrect;
int pitch = SDL_BYTESPERPIXEL(texture->format) * rect.w;
SDL_Rect UVrect = {rect.x / 2, rect.y / 2, (rect.w + 1) / 2, (rect.h + 1) / 2};
if (texturedata.lockedbuffer == nil) {
return;
@ -832,7 +840,7 @@ METAL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
[blitcmd copyFromBuffer:texturedata.lockedbuffer
sourceOffset:0
sourceBytesPerRow:SDL_BYTESPERPIXEL(texture->format) * rect.w
sourceBytesPerRow:pitch
sourceBytesPerImage:0
sourceSize:MTLSizeMake(rect.w, rect.h, 1)
toTexture:texturedata.mtltexture
@ -840,6 +848,46 @@ METAL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
destinationLevel:0
destinationOrigin:MTLOriginMake(rect.x, rect.y, 0)];
if (texturedata.yuv) {
int Uslice = texture->format == SDL_PIXELFORMAT_YV12 ? 1 : 0;
int Vslice = texture->format == SDL_PIXELFORMAT_YV12 ? 0 : 1;
int UVpitch = (pitch + 1) / 2;
[blitcmd copyFromBuffer:texturedata.lockedbuffer
sourceOffset:rect.h * pitch
sourceBytesPerRow:UVpitch
sourceBytesPerImage:UVpitch * UVrect.h
sourceSize:MTLSizeMake(UVrect.w, UVrect.h, 1)
toTexture:texturedata.mtltexture_uv
destinationSlice:Uslice
destinationLevel:0
destinationOrigin:MTLOriginMake(UVrect.x, UVrect.y, 0)];
[blitcmd copyFromBuffer:texturedata.lockedbuffer
sourceOffset:(rect.h * pitch) + UVrect.h * UVpitch
sourceBytesPerRow:UVpitch
sourceBytesPerImage:UVpitch * UVrect.h
sourceSize:MTLSizeMake(UVrect.w, UVrect.h, 1)
toTexture:texturedata.mtltexture_uv
destinationSlice:Vslice
destinationLevel:0
destinationOrigin:MTLOriginMake(UVrect.x, UVrect.y, 0)];
}
if (texturedata.nv12) {
int UVpitch = 2 * ((pitch + 1) / 2);
[blitcmd copyFromBuffer:texturedata.lockedbuffer
sourceOffset:rect.h * pitch
sourceBytesPerRow:UVpitch
sourceBytesPerImage:0
sourceSize:MTLSizeMake(UVrect.w, UVrect.h, 1)
toTexture:texturedata.mtltexture_uv
destinationSlice:0
destinationLevel:0
destinationOrigin:MTLOriginMake(UVrect.x, UVrect.y, 0)];
}
[blitcmd endEncoding];
[data.mtlcmdbuffer commit];