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metal: Deal better with -[CAMetalLayer nextDrawable] returning nil.

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Fixes #4863.
This commit is contained in:
Ryan C. Gordon 2021-11-09 11:50:49 -05:00
parent 8f63e9ff68
commit 04f42e0468
2 changed files with 54 additions and 18 deletions
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7
include/SDL_render.h
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@ -1806,9 +1806,14 @@ extern DECLSPEC void *SDLCALL SDL_RenderGetMetalLayer(SDL_Renderer * renderer);
* This function returns `void *`, so SDL doesn't have to include Metal's
* headers, but it can be safely cast to an `id<MTLRenderCommandEncoder>`.
*
* Note that as of SDL 2.0.18, this will return NULL if Metal refuses to
* give SDL a drawable to render to, which might happen if the window is
* hidden/minimized/offscreen. This doesn't apply to command encoders for
* render targets, just the window's backbacker. Check your return values!
*
* \param renderer The renderer to query
* \returns an `id<MTLRenderCommandEncoder>` on success, or NULL if the
* renderer isn't a Metal renderer.
* renderer isn't a Metal renderer or there was an error.
*
* \since This function is available since SDL 2.0.8.
*

65
src/render/metal/SDL_render_metal.m
View file

@ -459,7 +459,7 @@ ChoosePipelineState(METAL_RenderData *data, METAL_ShaderPipelines *pipelines, SD
return MakePipelineState(data, cache, [NSString stringWithFormat:@" (blend=custom 0x%x)", blendmode], blendmode);
}
static void
static SDL_bool
METAL_ActivateRenderCommandEncoder(SDL_Renderer * renderer, MTLLoadAction load, MTLClearColor *clear_color, id<MTLBuffer> vertex_buffer)
{
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
@ -481,10 +481,16 @@ METAL_ActivateRenderCommandEncoder(SDL_Renderer * renderer, MTLLoadAction load,
load = MTLLoadActionDontCare;
}
}
mtltexture = data.mtlbackbuffer.texture;
if (data.mtlbackbuffer != nil) {
mtltexture = data.mtlbackbuffer.texture;
}
}
SDL_assert(mtltexture);
/* mtltexture can be nil here if macOS refused to give us a drawable,
which apparently can happen for minimized windows, etc. */
if (mtltexture == nil) {
return SDL_FALSE;
}
if (load == MTLLoadActionClear) {
SDL_assert(clear_color != NULL);
@ -517,6 +523,8 @@ METAL_ActivateRenderCommandEncoder(SDL_Renderer * renderer, MTLLoadAction load,
// or whatever. This means we can _always_ batch rendering commands!
[data.mtlcmdbuffer enqueue];
}
return SDL_TRUE;
}
static void
@ -1205,7 +1213,7 @@ typedef struct
size_t color_offset;
} METAL_DrawStateCache;
static void
static SDL_bool
SetDrawState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const SDL_MetalFragmentFunction shader,
const size_t constants_offset, id<MTLBuffer> mtlbufvertex, METAL_DrawStateCache *statecache)
{
@ -1214,7 +1222,9 @@ SetDrawState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const SDL_Met
size_t first = cmd->data.draw.first;
id<MTLRenderPipelineState> newpipeline;
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, statecache->vertex_buffer);
if (!METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, statecache->vertex_buffer)) {
return SDL_FALSE;
}
if (statecache->viewport_dirty) {
MTLViewport viewport;
@ -1268,9 +1278,10 @@ SetDrawState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const SDL_Met
}
[data.mtlcmdencoder setVertexBufferOffset:first atIndex:0]; /* position/texcoords */
return SDL_TRUE;
}
static void
static SDL_bool
SetCopyState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const size_t constants_offset,
id<MTLBuffer> mtlbufvertex, METAL_DrawStateCache *statecache)
{
@ -1278,7 +1289,9 @@ SetCopyState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const size_t
SDL_Texture *texture = cmd->data.draw.texture;
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
SetDrawState(renderer, cmd, texturedata.fragmentFunction, constants_offset, mtlbufvertex, statecache);
if (!SetDrawState(renderer, cmd, texturedata.fragmentFunction, constants_offset, mtlbufvertex, statecache)) {
return SDL_FALSE;
}
if (texture != statecache->texture) {
METAL_TextureData *oldtexturedata = NULL;
@ -1296,6 +1309,7 @@ SetCopyState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, const size_t
}
statecache->texture = texture;
}
return SDL_TRUE;
}
static int
@ -1393,6 +1407,7 @@ METAL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
MTLClearColor color = MTLClearColorMake(r / 255.0f, g / 255.0f, b / 255.0f, a / 255.0f);
// get new command encoder, set up with an initial clear operation.
// (this might fail, and future draw operations will notice.)
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionClear, &color, mtlbufvertex);
break;
}
@ -1401,8 +1416,9 @@ METAL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
case SDL_RENDERCMD_DRAW_LINES: {
const size_t count = cmd->data.draw.count;
const MTLPrimitiveType primtype = (cmd->command == SDL_RENDERCMD_DRAW_POINTS) ? MTLPrimitiveTypePoint : MTLPrimitiveTypeLineStrip;
SetDrawState(renderer, cmd, SDL_METAL_FRAGMENT_SOLID, CONSTANTS_OFFSET_HALF_PIXEL_TRANSFORM, mtlbufvertex, &statecache);
[data.mtlcmdencoder drawPrimitives:primtype vertexStart:0 vertexCount:count];
if (SetDrawState(renderer, cmd, SDL_METAL_FRAGMENT_SOLID, CONSTANTS_OFFSET_HALF_PIXEL_TRANSFORM, mtlbufvertex, &statecache)) {
[data.mtlcmdencoder drawPrimitives:primtype vertexStart:0 vertexCount:count];
}
break;
}
@ -1420,11 +1436,13 @@ METAL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
SDL_Texture *texture = cmd->data.draw.texture;
if (texture) {
SetCopyState(renderer, cmd, CONSTANTS_OFFSET_IDENTITY, mtlbufvertex, &statecache);
[data.mtlcmdencoder drawPrimitives:MTLPrimitiveTypeTriangle vertexStart:0 vertexCount:count];
if (SetCopyState(renderer, cmd, CONSTANTS_OFFSET_IDENTITY, mtlbufvertex, &statecache)) {
[data.mtlcmdencoder drawPrimitives:MTLPrimitiveTypeTriangle vertexStart:0 vertexCount:count];
}
} else {
SetDrawState(renderer, cmd, SDL_METAL_FRAGMENT_SOLID, CONSTANTS_OFFSET_IDENTITY, mtlbufvertex, &statecache);
[data.mtlcmdencoder drawPrimitives:MTLPrimitiveTypeTriangle vertexStart:0 vertexCount:count];
if (SetDrawState(renderer, cmd, SDL_METAL_FRAGMENT_SOLID, CONSTANTS_OFFSET_IDENTITY, mtlbufvertex, &statecache)) {
[data.mtlcmdencoder drawPrimitives:MTLPrimitiveTypeTriangle vertexStart:0 vertexCount:count];
}
}
break;
}
@ -1443,7 +1461,9 @@ METAL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
if (!METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil)) {
return SDL_SetError("Failed to activate render command encoder (is your window in the background?");
}
[data.mtlcmdencoder endEncoding];
id<MTLTexture> mtltexture = data.mtlpassdesc.colorAttachments[0].texture;
@ -1488,20 +1508,28 @@ static void
METAL_RenderPresent(SDL_Renderer * renderer)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
SDL_bool ready = SDL_TRUE;
// If we don't have a command buffer, we can't present, so activate to get one.
if (data.mtlcmdencoder == nil) {
// We haven't even gotten a backbuffer yet? Clear it to black. Otherwise, load the existing data.
if (data.mtlbackbuffer == nil) {
MTLClearColor color = MTLClearColorMake(0.0f, 0.0f, 0.0f, 1.0f);
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionClear, &color, nil);
ready = METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionClear, &color, nil);
} else {
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
ready = METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
}
}
[data.mtlcmdencoder endEncoding];
[data.mtlcmdbuffer presentDrawable:data.mtlbackbuffer];
// If we don't have a drawable to present, don't try to present it.
// But we'll still try to commit the command buffer in case it was already enqueued.
if (ready) {
SDL_assert(data.mtlbackbuffer != nil);
[data.mtlcmdbuffer presentDrawable:data.mtlbackbuffer];
}
[data.mtlcmdbuffer commit];
data.mtlcmdencoder = nil;
@ -1544,6 +1572,9 @@ METAL_GetMetalLayer(SDL_Renderer * renderer)
static void *
METAL_GetMetalCommandEncoder(SDL_Renderer * renderer)
{ @autoreleasepool {
// note that data.mtlcmdencoder can be nil if METAL_ActivateRenderCommandEncoder fails.
// Before SDL 2.0.18, it might have returned a non-nil encoding that might not have been
// usable for presentation. Check your return values!
METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
return (__bridge void*)data.mtlcmdencoder;