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SDL_render_metal.m
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SDL_render_metal.m
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_RENDER_METAL && !SDL_RENDER_DISABLED
#include "SDL_hints.h"
#include "SDL_syswm.h"
#include "SDL_metal.h"
#include "../SDL_sysrender.h"
#include <Availability.h>
#import <Metal/Metal.h>
#import <QuartzCore/CAMetalLayer.h>
#ifdef __MACOSX__
#import <AppKit/NSView.h>
#endif
/* Regenerate these with build-metal-shaders.sh */
#ifdef __MACOSX__
#include "SDL_shaders_metal_osx.h"
#elif defined(__TVOS__)
#if TARGET_OS_SIMULATOR
#include "SDL_shaders_metal_tvsimulator.h"
#else
#include "SDL_shaders_metal_tvos.h"
#endif
#else
#if TARGET_OS_SIMULATOR
#include "SDL_shaders_metal_iphonesimulator.h"
#else
#include "SDL_shaders_metal_ios.h"
#endif
#endif
/* Apple Metal renderer implementation */
/* Used to re-create the window with Metal capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
/* macOS requires constants in a buffer to have a 256 byte alignment. */
/* Use native type alignments from https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf */
#if defined(__MACOSX__) || TARGET_OS_SIMULATOR || TARGET_OS_MACCATALYST
#define CONSTANT_ALIGN(x) (256)
#else
#define CONSTANT_ALIGN(x) (x < 4 ? 4 : x)
#endif
#define DEVICE_ALIGN(x) (x < 4 ? 4 : x)
#define ALIGN_CONSTANTS(align, size) ((size + CONSTANT_ALIGN(align) - 1) & (~(CONSTANT_ALIGN(align) - 1)))
static const size_t CONSTANTS_OFFSET_INVALID = 0xFFFFFFFF;
static const size_t CONSTANTS_OFFSET_IDENTITY = 0;
static const size_t CONSTANTS_OFFSET_HALF_PIXEL_TRANSFORM = ALIGN_CONSTANTS(16, CONSTANTS_OFFSET_IDENTITY + sizeof(float) * 16);
static const size_t CONSTANTS_OFFSET_DECODE_JPEG = ALIGN_CONSTANTS(16, CONSTANTS_OFFSET_HALF_PIXEL_TRANSFORM + sizeof(float) * 16);
static const size_t CONSTANTS_OFFSET_DECODE_BT601 = ALIGN_CONSTANTS(16, CONSTANTS_OFFSET_DECODE_JPEG + sizeof(float) * 4 * 4);
static const size_t CONSTANTS_OFFSET_DECODE_BT709 = ALIGN_CONSTANTS(16, CONSTANTS_OFFSET_DECODE_BT601 + sizeof(float) * 4 * 4);
static const size_t CONSTANTS_LENGTH = CONSTANTS_OFFSET_DECODE_BT709 + sizeof(float) * 4 * 4;
typedef enum SDL_MetalVertexFunction
{
SDL_METAL_VERTEX_SOLID,
SDL_METAL_VERTEX_COPY,
} SDL_MetalVertexFunction;
typedef enum SDL_MetalFragmentFunction
{
SDL_METAL_FRAGMENT_SOLID = 0,
SDL_METAL_FRAGMENT_COPY,
SDL_METAL_FRAGMENT_YUV,
SDL_METAL_FRAGMENT_NV12,
SDL_METAL_FRAGMENT_NV21,
SDL_METAL_FRAGMENT_COUNT,
} SDL_MetalFragmentFunction;
typedef struct METAL_PipelineState
{
SDL_BlendMode blendMode;
void *pipe;
} METAL_PipelineState;
typedef struct METAL_PipelineCache
{
METAL_PipelineState *states;
int count;
SDL_MetalVertexFunction vertexFunction;
SDL_MetalFragmentFunction fragmentFunction;
MTLPixelFormat renderTargetFormat;
const char *label;
} METAL_PipelineCache;
/* Each shader combination used by drawing functions has a separate pipeline
* cache, and we have a separate list of caches for each render target pixel
* format. This is more efficient than iterating over a global cache to find
* the pipeline based on the specified shader combination and RT pixel format,
* since we know what the RT pixel format is when we set the render target, and
* we know what the shader combination is inside each drawing function's code. */
typedef struct METAL_ShaderPipelines
{
MTLPixelFormat renderTargetFormat;
METAL_PipelineCache caches[SDL_METAL_FRAGMENT_COUNT];
} METAL_ShaderPipelines;
@interface METAL_RenderData : NSObject
@property (nonatomic, retain) id<MTLDevice> mtldevice;
@property (nonatomic, retain) id<MTLCommandQueue> mtlcmdqueue;
@property (nonatomic, retain) id<MTLCommandBuffer> mtlcmdbuffer;
@property (nonatomic, retain) id<MTLRenderCommandEncoder> mtlcmdencoder;
@property (nonatomic, retain) id<MTLLibrary> mtllibrary;
@property (nonatomic, retain) id<CAMetalDrawable> mtlbackbuffer;
@property (nonatomic, retain) id<MTLSamplerState> mtlsamplernearest;
@property (nonatomic, retain) id<MTLSamplerState> mtlsamplerlinear;
@property (nonatomic, retain) id<MTLBuffer> mtlbufconstants;
@property (nonatomic, retain) id<MTLBuffer> mtlbufquadindices;
@property (nonatomic, assign) SDL_MetalView mtlview;
@property (nonatomic, retain) CAMetalLayer *mtllayer;
@property (nonatomic, retain) MTLRenderPassDescriptor *mtlpassdesc;
@property (nonatomic, assign) METAL_ShaderPipelines *activepipelines;
@property (nonatomic, assign) METAL_ShaderPipelines *allpipelines;
@property (nonatomic, assign) int pipelinescount;
@end
@implementation METAL_RenderData
#if !__has_feature(objc_arc)
- (void)dealloc
{
[_mtldevice release];
[_mtlcmdqueue release];
[_mtlcmdbuffer release];
[_mtlcmdencoder release];
[_mtllibrary release];
[_mtlbackbuffer release];
[_mtlsamplernearest release];
[_mtlsamplerlinear release];
[_mtlbufconstants release];
[_mtlbufquadindices release];
[_mtllayer release];
[_mtlpassdesc release];
[super dealloc];
}
#endif
@end
@interface METAL_TextureData : NSObject
@property (nonatomic, retain) id<MTLTexture> mtltexture;
@property (nonatomic, retain) id<MTLTexture> mtltexture_uv;
@property (nonatomic, retain) id<MTLSamplerState> mtlsampler;
@property (nonatomic, assign) SDL_MetalFragmentFunction fragmentFunction;
@property (nonatomic, assign) BOOL yuv;
@property (nonatomic, assign) BOOL nv12;
@property (nonatomic, assign) size_t conversionBufferOffset;
@property (nonatomic, assign) BOOL hasdata;
@property (nonatomic, retain) id<MTLBuffer> lockedbuffer;
@property (nonatomic, assign) SDL_Rect lockedrect;
@end
@implementation METAL_TextureData
#if !__has_feature(objc_arc)
- (void)dealloc
{
[_mtltexture release];
[_mtltexture_uv release];
[_mtlsampler release];
[_lockedbuffer release];
[super dealloc];
}
#endif
@end
static int
IsMetalAvailable(const SDL_SysWMinfo *syswm)
{
if (syswm->subsystem != SDL_SYSWM_COCOA && syswm->subsystem != SDL_SYSWM_UIKIT) {
return SDL_SetError("Metal render target only supports Cocoa and UIKit video targets at the moment.");
}
// this checks a weak symbol.
#if (defined(__MACOSX__) && (MAC_OS_X_VERSION_MIN_REQUIRED < 101100))
if (MTLCreateSystemDefaultDevice == NULL) { // probably on 10.10 or lower.
return SDL_SetError("Metal framework not available on this system");
}
#endif
return 0;
}
static const MTLBlendOperation invalidBlendOperation = (MTLBlendOperation)0xFFFFFFFF;
static const MTLBlendFactor invalidBlendFactor = (MTLBlendFactor)0xFFFFFFFF;
static MTLBlendOperation
GetBlendOperation(SDL_BlendOperation operation)
{
switch (operation) {
case SDL_BLENDOPERATION_ADD: return MTLBlendOperationAdd;
case SDL_BLENDOPERATION_SUBTRACT: return MTLBlendOperationSubtract;
case SDL_BLENDOPERATION_REV_SUBTRACT: return MTLBlendOperationReverseSubtract;
case SDL_BLENDOPERATION_MINIMUM: return MTLBlendOperationMin;
case SDL_BLENDOPERATION_MAXIMUM: return MTLBlendOperationMax;
default: return invalidBlendOperation;
}
}
static MTLBlendFactor
GetBlendFactor(SDL_BlendFactor factor)
{
switch (factor) {
case SDL_BLENDFACTOR_ZERO: return MTLBlendFactorZero;
case SDL_BLENDFACTOR_ONE: return MTLBlendFactorOne;
case SDL_BLENDFACTOR_SRC_COLOR: return MTLBlendFactorSourceColor;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR: return MTLBlendFactorOneMinusSourceColor;
case SDL_BLENDFACTOR_SRC_ALPHA: return MTLBlendFactorSourceAlpha;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA: return MTLBlendFactorOneMinusSourceAlpha;
case SDL_BLENDFACTOR_DST_COLOR: return MTLBlendFactorDestinationColor;
case SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR: return MTLBlendFactorOneMinusDestinationColor;
case SDL_BLENDFACTOR_DST_ALPHA: return MTLBlendFactorDestinationAlpha;
case SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA: return MTLBlendFactorOneMinusDestinationAlpha;
default: return invalidBlendFactor;
}
}
static NSString *
GetVertexFunctionName(SDL_MetalVertexFunction function)
{
switch (function) {
case SDL_METAL_VERTEX_SOLID: return @"SDL_Solid_vertex";
case SDL_METAL_VERTEX_COPY: return @"SDL_Copy_vertex";
default: return nil;
}
}
static NSString *
GetFragmentFunctionName(SDL_MetalFragmentFunction function)
{
switch (function) {
case SDL_METAL_FRAGMENT_SOLID: return @"SDL_Solid_fragment";
case SDL_METAL_FRAGMENT_COPY: return @"SDL_Copy_fragment";
case SDL_METAL_FRAGMENT_YUV: return @"SDL_YUV_fragment";
case SDL_METAL_FRAGMENT_NV12: return @"SDL_NV12_fragment";
case SDL_METAL_FRAGMENT_NV21: return @"SDL_NV21_fragment";
default: return nil;
}
}
static id<MTLRenderPipelineState>
MakePipelineState(METAL_RenderData *data, METAL_PipelineCache *cache,
NSString *blendlabel, SDL_BlendMode blendmode)
{
id<MTLFunction> mtlvertfn = [data.mtllibrary newFunctionWithName:GetVertexFunctionName(cache->vertexFunction)];
id<MTLFunction> mtlfragfn = [data.mtllibrary newFunctionWithName:GetFragmentFunctionName(cache->fragmentFunction)];
SDL_assert(mtlvertfn != nil);
SDL_assert(mtlfragfn != nil);
MTLRenderPipelineDescriptor *mtlpipedesc = [[MTLRenderPipelineDescriptor alloc] init];
mtlpipedesc.vertexFunction = mtlvertfn;
mtlpipedesc.fragmentFunction = mtlfragfn;
MTLVertexDescriptor *vertdesc = [MTLVertexDescriptor vertexDescriptor];
switch (cache->vertexFunction) {
case SDL_METAL_VERTEX_SOLID:
/* position (float2) */
vertdesc.layouts[0].stride = sizeof(float) * 2;
vertdesc.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
vertdesc.attributes[0].format = MTLVertexFormatFloat2;
vertdesc.attributes[0].offset = 0;
vertdesc.attributes[0].bufferIndex = 0;
break;
case SDL_METAL_VERTEX_COPY:
/* position (float2), texcoord (float2) */
vertdesc.layouts[0].stride = sizeof(float) * 4;
vertdesc.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
vertdesc.attributes[0].format = MTLVertexFormatFloat2;
vertdesc.attributes[0].offset = 0;
vertdesc.attributes[0].bufferIndex = 0;
vertdesc.attributes[1].format = MTLVertexFormatFloat2;
vertdesc.attributes[1].offset = sizeof(float) * 2;
vertdesc.attributes[1].bufferIndex = 0;
break;
}
mtlpipedesc.vertexDescriptor = vertdesc;
MTLRenderPipelineColorAttachmentDescriptor *rtdesc = mtlpipedesc.colorAttachments[0];
rtdesc.pixelFormat = cache->renderTargetFormat;
if (blendmode != SDL_BLENDMODE_NONE) {
rtdesc.blendingEnabled = YES;
rtdesc.sourceRGBBlendFactor = GetBlendFactor(SDL_GetBlendModeSrcColorFactor(blendmode));
rtdesc.destinationRGBBlendFactor = GetBlendFactor(SDL_GetBlendModeDstColorFactor(blendmode));
rtdesc.rgbBlendOperation = GetBlendOperation(SDL_GetBlendModeColorOperation(blendmode));
rtdesc.sourceAlphaBlendFactor = GetBlendFactor(SDL_GetBlendModeSrcAlphaFactor(blendmode));
rtdesc.destinationAlphaBlendFactor = GetBlendFactor(SDL_GetBlendModeDstAlphaFactor(blendmode));
rtdesc.alphaBlendOperation = GetBlendOperation(SDL_GetBlendModeAlphaOperation(blendmode));
} else {
rtdesc.blendingEnabled = NO;
}
mtlpipedesc.label = [@(cache->label) stringByAppendingString:blendlabel];
NSError *err = nil;
id<MTLRenderPipelineState> state = [data.mtldevice newRenderPipelineStateWithDescriptor:mtlpipedesc error:&err];
SDL_assert(err == nil);
METAL_PipelineState pipeline;
pipeline.blendMode = blendmode;
pipeline.pipe = (void *)CFBridgingRetain(state);
METAL_PipelineState *states = SDL_realloc(cache->states, (cache->count + 1) * sizeof(pipeline));
#if !__has_feature(objc_arc)
[mtlpipedesc release]; // !!! FIXME: can these be reused for each creation, or does the pipeline obtain it?
[mtlvertfn release];
[mtlfragfn release];
[state release];
#endif
if (states) {
states[cache->count++] = pipeline;
cache->states = states;
return (__bridge id<MTLRenderPipelineState>)pipeline.pipe;
} else {
CFBridgingRelease(pipeline.pipe);
SDL_OutOfMemory();
return NULL;
}
}
static void
MakePipelineCache(METAL_RenderData *data, METAL_PipelineCache *cache, const char *label,
MTLPixelFormat rtformat, SDL_MetalVertexFunction vertfn, SDL_MetalFragmentFunction fragfn)
{
SDL_zerop(cache);
cache->vertexFunction = vertfn;
cache->fragmentFunction = fragfn;
cache->renderTargetFormat = rtformat;
cache->label = label;
/* Create pipeline states for the default blend modes. Custom blend modes
* will be added to the cache on-demand. */
MakePipelineState(data, cache, @" (blend=none)", SDL_BLENDMODE_NONE);
MakePipelineState(data, cache, @" (blend=blend)", SDL_BLENDMODE_BLEND);
MakePipelineState(data, cache, @" (blend=add)", SDL_BLENDMODE_ADD);
MakePipelineState(data, cache, @" (blend=mod)", SDL_BLENDMODE_MOD);
MakePipelineState(data, cache, @" (blend=mul)", SDL_BLENDMODE_MUL);
}
static void
DestroyPipelineCache(METAL_PipelineCache *cache)
{
if (cache != NULL) {
for (int i = 0; i < cache->count; i++) {
CFBridgingRelease(cache->states[i].pipe);
}
SDL_free(cache->states);
}
}
void
MakeShaderPipelines(METAL_RenderData *data, METAL_ShaderPipelines *pipelines, MTLPixelFormat rtformat)
{
SDL_zerop(pipelines);
pipelines->renderTargetFormat = rtformat;
MakePipelineCache(data, &pipelines->caches[SDL_METAL_FRAGMENT_SOLID], "SDL primitives pipeline", rtformat, SDL_METAL_VERTEX_SOLID, SDL_METAL_FRAGMENT_SOLID);
MakePipelineCache(data, &pipelines->caches[SDL_METAL_FRAGMENT_COPY], "SDL copy pipeline", rtformat, SDL_METAL_VERTEX_COPY, SDL_METAL_FRAGMENT_COPY);
MakePipelineCache(data, &pipelines->caches[SDL_METAL_FRAGMENT_YUV], "SDL YUV pipeline", rtformat, SDL_METAL_VERTEX_COPY, SDL_METAL_FRAGMENT_YUV);
MakePipelineCache(data, &pipelines->caches[SDL_METAL_FRAGMENT_NV12], "SDL NV12 pipeline", rtformat, SDL_METAL_VERTEX_COPY, SDL_METAL_FRAGMENT_NV12);
MakePipelineCache(data, &pipelines->caches[SDL_METAL_FRAGMENT_NV21], "SDL NV21 pipeline", rtformat, SDL_METAL_VERTEX_COPY, SDL_METAL_FRAGMENT_NV21);
}
static METAL_ShaderPipelines *
ChooseShaderPipelines(METAL_RenderData *data, MTLPixelFormat rtformat)
{
METAL_ShaderPipelines *allpipelines = data.allpipelines;
int count = data.pipelinescount;
for (int i = 0; i < count; i++) {
if (allpipelines[i].renderTargetFormat == rtformat) {
return &allpipelines[i];
}
}
allpipelines = SDL_realloc(allpipelines, (count + 1) * sizeof(METAL_ShaderPipelines));
if (allpipelines == NULL) {
SDL_OutOfMemory();
return NULL;
}
MakeShaderPipelines(data, &allpipelines[count], rtformat);
data.allpipelines = allpipelines;
data.pipelinescount = count + 1;
return &data.allpipelines[count];
}
static void
DestroyAllPipelines(METAL_ShaderPipelines *allpipelines, int count)
{
if (allpipelines != NULL) {
for (int i = 0; i < count; i++) {
for (int cache = 0; cache < SDL_METAL_FRAGMENT_COUNT; cache++) {
DestroyPipelineCache(&allpipelines[i].caches[cache]);
}
}
SDL_free(allpipelines);
}
}
static inline id<MTLRenderPipelineState>
ChoosePipelineState(METAL_RenderData *data, METAL_ShaderPipelines *pipelines, SDL_MetalFragmentFunction fragfn, SDL_BlendMode blendmode)
{
METAL_PipelineCache *cache = &pipelines->caches[fragfn];
for (int i = 0; i < cache->count; i++) {
if (cache->states[i].blendMode == blendmode) {
return (__bridge id<MTLRenderPipelineState>)cache->states[i].pipe;
}
}
return MakePipelineState(data, cache, [NSString stringWithFormat:@" (blend=custom 0x%x)", blendmode], blendmode);
}
static void
METAL_ActivateRenderCommandEncoder(SDL_Renderer * renderer, MTLLoadAction load, MTLClearColor *clear_color, id<MTLBuffer> vertex_buffer)
{
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
/* Our SetRenderTarget just signals that the next render operation should
* set up a new render pass. This is where that work happens. */
if (data.mtlcmdencoder == nil) {
id<MTLTexture> mtltexture = nil;
if (renderer->target != NULL) {
METAL_TextureData *texdata = (__bridge METAL_TextureData *)renderer->target->driverdata;
mtltexture = texdata.mtltexture;
} else {
if (data.mtlbackbuffer == nil) {
/* The backbuffer's contents aren't guaranteed to persist after
* presenting, so we can leave it undefined when loading it. */
data.mtlbackbuffer = [data.mtllayer nextDrawable];
if (load == MTLLoadActionLoad) {
load = MTLLoadActionDontCare;
}
}
mtltexture = data.mtlbackbuffer.texture;
}
SDL_assert(mtltexture);
if (load == MTLLoadActionClear) {
SDL_assert(clear_color != NULL);
data.mtlpassdesc.colorAttachments[0].clearColor = *clear_color;
}
data.mtlpassdesc.colorAttachments[0].loadAction = load;
data.mtlpassdesc.colorAttachments[0].texture = mtltexture;
data.mtlcmdbuffer = [data.mtlcmdqueue commandBuffer];
data.mtlcmdencoder = [data.mtlcmdbuffer renderCommandEncoderWithDescriptor:data.mtlpassdesc];
if (data.mtlbackbuffer != nil && mtltexture == data.mtlbackbuffer.texture) {
data.mtlcmdencoder.label = @"SDL metal renderer backbuffer";
} else {
data.mtlcmdencoder.label = @"SDL metal renderer render target";
}
/* Set up buffer bindings for positions, texcoords, and color once here,
* the offsets are adjusted in the code that uses them. */
if (vertex_buffer != nil) {
[data.mtlcmdencoder setVertexBuffer:vertex_buffer offset:0 atIndex:0];
[data.mtlcmdencoder setFragmentBuffer:vertex_buffer offset:0 atIndex:0];
}
data.activepipelines = ChooseShaderPipelines(data, mtltexture.pixelFormat);
// make sure this has a definite place in the queue. This way it will
// execute reliably whether the app tries to make its own command buffers
// or whatever. This means we can _always_ batch rendering commands!
[data.mtlcmdbuffer enqueue];
}
}
static void
METAL_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
{
if (event->event == SDL_WINDOWEVENT_SHOWN ||
event->event == SDL_WINDOWEVENT_HIDDEN) {
// !!! FIXME: write me
}
}
static int
METAL_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
if (w) {
*w = (int)data.mtllayer.drawableSize.width;
}
if (h) {
*h = (int)data.mtllayer.drawableSize.height;
}
return 0;
}}
static SDL_bool
METAL_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
SDL_BlendFactor srcColorFactor = SDL_GetBlendModeSrcColorFactor(blendMode);
SDL_BlendFactor srcAlphaFactor = SDL_GetBlendModeSrcAlphaFactor(blendMode);
SDL_BlendOperation colorOperation = SDL_GetBlendModeColorOperation(blendMode);
SDL_BlendFactor dstColorFactor = SDL_GetBlendModeDstColorFactor(blendMode);
SDL_BlendFactor dstAlphaFactor = SDL_GetBlendModeDstAlphaFactor(blendMode);
SDL_BlendOperation alphaOperation = SDL_GetBlendModeAlphaOperation(blendMode);
if (GetBlendFactor(srcColorFactor) == invalidBlendFactor ||
GetBlendFactor(srcAlphaFactor) == invalidBlendFactor ||
GetBlendOperation(colorOperation) == invalidBlendOperation ||
GetBlendFactor(dstColorFactor) == invalidBlendFactor ||
GetBlendFactor(dstAlphaFactor) == invalidBlendFactor ||
GetBlendOperation(alphaOperation) == invalidBlendOperation) {
return SDL_FALSE;
}
return SDL_TRUE;
}
static int
METAL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
MTLPixelFormat pixfmt;
switch (texture->format) {
case SDL_PIXELFORMAT_ABGR8888:
pixfmt = MTLPixelFormatRGBA8Unorm;
break;
case SDL_PIXELFORMAT_ARGB8888:
pixfmt = MTLPixelFormatBGRA8Unorm;
break;
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_YV12:
case SDL_PIXELFORMAT_NV12:
case SDL_PIXELFORMAT_NV21:
pixfmt = MTLPixelFormatR8Unorm;
break;
default:
return SDL_SetError("Texture format %s not supported by Metal", SDL_GetPixelFormatName(texture->format));
}
MTLTextureDescriptor *mtltexdesc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:pixfmt
width:(NSUInteger)texture->w height:(NSUInteger)texture->h mipmapped:NO];
/* Not available in iOS 8. */
if ([mtltexdesc respondsToSelector:@selector(usage)]) {
if (texture->access == SDL_TEXTUREACCESS_TARGET) {
mtltexdesc.usage = MTLTextureUsageShaderRead | MTLTextureUsageRenderTarget;
} else {
mtltexdesc.usage = MTLTextureUsageShaderRead;
}
}
id<MTLTexture> mtltexture = [data.mtldevice newTextureWithDescriptor:mtltexdesc];
if (mtltexture == nil) {
return SDL_SetError("Texture allocation failed");
}
id<MTLTexture> mtltexture_uv = nil;
BOOL yuv = (texture->format == SDL_PIXELFORMAT_IYUV) || (texture->format == SDL_PIXELFORMAT_YV12);
BOOL nv12 = (texture->format == SDL_PIXELFORMAT_NV12) || (texture->format == SDL_PIXELFORMAT_NV21);
if (yuv) {
mtltexdesc.pixelFormat = MTLPixelFormatR8Unorm;
mtltexdesc.width = (texture->w + 1) / 2;
mtltexdesc.height = (texture->h + 1) / 2;
mtltexdesc.textureType = MTLTextureType2DArray;
mtltexdesc.arrayLength = 2;
} else if (nv12) {
mtltexdesc.pixelFormat = MTLPixelFormatRG8Unorm;
mtltexdesc.width = (texture->w + 1) / 2;
mtltexdesc.height = (texture->h + 1) / 2;
}
if (yuv || nv12) {
mtltexture_uv = [data.mtldevice newTextureWithDescriptor:mtltexdesc];
if (mtltexture_uv == nil) {
#if !__has_feature(objc_arc)
[mtltexture release];
#endif
return SDL_SetError("Texture allocation failed");
}
}
METAL_TextureData *texturedata = [[METAL_TextureData alloc] init];
if (texture->scaleMode == SDL_ScaleModeNearest) {
texturedata.mtlsampler = data.mtlsamplernearest;
} else {
texturedata.mtlsampler = data.mtlsamplerlinear;
}
texturedata.mtltexture = mtltexture;
texturedata.mtltexture_uv = mtltexture_uv;
texturedata.yuv = yuv;
texturedata.nv12 = nv12;
if (yuv) {
texturedata.fragmentFunction = SDL_METAL_FRAGMENT_YUV;
} else if (texture->format == SDL_PIXELFORMAT_NV12) {
texturedata.fragmentFunction = SDL_METAL_FRAGMENT_NV12;
} else if (texture->format == SDL_PIXELFORMAT_NV21) {
texturedata.fragmentFunction = SDL_METAL_FRAGMENT_NV21;
} else {
texturedata.fragmentFunction = SDL_METAL_FRAGMENT_COPY;
}
if (yuv || nv12) {
size_t offset = 0;
SDL_YUV_CONVERSION_MODE mode = SDL_GetYUVConversionModeForResolution(texture->w, texture->h);
switch (mode) {
case SDL_YUV_CONVERSION_JPEG: offset = CONSTANTS_OFFSET_DECODE_JPEG; break;
case SDL_YUV_CONVERSION_BT601: offset = CONSTANTS_OFFSET_DECODE_BT601; break;
case SDL_YUV_CONVERSION_BT709: offset = CONSTANTS_OFFSET_DECODE_BT709; break;
default: offset = 0; break;
}
texturedata.conversionBufferOffset = offset;
}
texture->driverdata = (void*)CFBridgingRetain(texturedata);
#if !__has_feature(objc_arc)
[texturedata release];
[mtltexture release];
[mtltexture_uv release];
#endif
return 0;
}}
static void
METAL_UploadTextureData(id<MTLTexture> texture, SDL_Rect rect, int slice,
const void * pixels, int pitch)
{
[texture replaceRegion:MTLRegionMake2D(rect.x, rect.y, rect.w, rect.h)
mipmapLevel:0
slice:slice
withBytes:pixels
bytesPerRow:pitch
bytesPerImage:0];
}
static MTLStorageMode
METAL_GetStorageMode(id<MTLResource> resource)
{
/* iOS 8 does not have this method. */
if ([resource respondsToSelector:@selector(storageMode)]) {
return resource.storageMode;
}
return MTLStorageModeShared;
}
static int
METAL_UpdateTextureInternal(SDL_Renderer * renderer, METAL_TextureData *texturedata,
id<MTLTexture> texture, SDL_Rect rect, int slice,
const void * pixels, int pitch)
{
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
SDL_Rect stagingrect = {0, 0, rect.w, rect.h};
MTLTextureDescriptor *desc;
/* If the texture is managed or shared and this is the first upload, we can
* use replaceRegion to upload to it directly. Otherwise we upload the data
* to a staging texture and copy that over. */
if (!texturedata.hasdata && METAL_GetStorageMode(texture) != MTLStorageModePrivate) {
METAL_UploadTextureData(texture, rect, slice, pixels, pitch);
return 0;
}
desc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:texture.pixelFormat
width:rect.w
height:rect.h
mipmapped:NO];
if (desc == nil) {
return SDL_OutOfMemory();
}
/* TODO: We could have a pool of textures or a MTLHeap we allocate from,
* and release a staging texture back to the pool in the command buffer's
* completion handler. */
id<MTLTexture> stagingtex = [data.mtldevice newTextureWithDescriptor:desc];
if (stagingtex == nil) {
return SDL_OutOfMemory();
}
#if !__has_feature(objc_arc)
[stagingtex autorelease];
#endif
METAL_UploadTextureData(stagingtex, stagingrect, 0, pixels, pitch);
if (data.mtlcmdencoder != nil) {
[data.mtlcmdencoder endEncoding];
data.mtlcmdencoder = nil;
}
if (data.mtlcmdbuffer == nil) {
data.mtlcmdbuffer = [data.mtlcmdqueue commandBuffer];
}
id<MTLBlitCommandEncoder> blitcmd = [data.mtlcmdbuffer blitCommandEncoder];
[blitcmd copyFromTexture:stagingtex
sourceSlice:0
sourceLevel:0
sourceOrigin:MTLOriginMake(0, 0, 0)
sourceSize:MTLSizeMake(rect.w, rect.h, 1)
toTexture:texture
destinationSlice:slice
destinationLevel:0
destinationOrigin:MTLOriginMake(rect.x, rect.y, 0)];
[blitcmd endEncoding];
/* TODO: This isn't very efficient for the YUV formats, which call
* UpdateTextureInternal multiple times in a row. */
[data.mtlcmdbuffer commit];
data.mtlcmdbuffer = nil;
return 0;
}
static int
METAL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
{ @autoreleasepool {
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture, *rect, 0, pixels, pitch) < 0) {
return -1;
}
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;
SDL_Rect UVrect = {rect->x / 2, rect->y / 2, (rect->w + 1) / 2, (rect->h + 1) / 2};
/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, Uslice, pixels, UVpitch) < 0) {
return -1;
}
/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)pixels + UVrect.h * UVpitch);
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, Vslice, pixels, UVpitch) < 0) {
return -1;
}
}
if (texturedata.nv12) {
SDL_Rect UVrect = {rect->x / 2, rect->y / 2, (rect->w + 1) / 2, (rect->h + 1) / 2};
int UVpitch = 2 * ((pitch + 1) / 2);
/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, 0, pixels, UVpitch) < 0) {
return -1;
}
}
texturedata.hasdata = YES;
return 0;
}}
#if SDL_HAVE_YUV
static int
METAL_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *Uplane, int Upitch,
const Uint8 *Vplane, int Vpitch)
{ @autoreleasepool {
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
const int Uslice = 0;
const int Vslice = 1;
SDL_Rect UVrect = {rect->x / 2, rect->y / 2, (rect->w + 1) / 2, (rect->h + 1) / 2};
/* Bail out if we're supposed to update an empty rectangle */
if (rect->w <= 0 || rect->h <= 0) {
return 0;
}
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture, *rect, 0, Yplane, Ypitch) < 0) {
return -1;
}
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, Uslice, Uplane, Upitch)) {
return -1;
}
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, Vslice, Vplane, Vpitch)) {
return -1;
}
texturedata.hasdata = YES;
return 0;
}}
static int
METAL_UpdateTextureNV(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *UVplane, int UVpitch)
{ @autoreleasepool {
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
SDL_Rect UVrect = {rect->x / 2, rect->y / 2, (rect->w + 1) / 2, (rect->h + 1) / 2};
/* Bail out if we're supposed to update an empty rectangle */
if (rect->w <= 0 || rect->h <= 0) {
return 0;
}
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture, *rect, 0, Yplane, Ypitch) < 0) {
return -1;
}
if (METAL_UpdateTextureInternal(renderer, texturedata, texturedata.mtltexture_uv, UVrect, 0, UVplane, UVpitch) < 0) {
return -1;
}
texturedata.hasdata = YES;
return 0;
}}
#endif
static int
METAL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
int buffersize = 0;
id<MTLBuffer> lockedbuffer = nil;
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;
}
lockedbuffer = [data.mtldevice newBufferWithLength:buffersize options:MTLResourceStorageModeShared];
if (lockedbuffer == nil) {
return SDL_OutOfMemory();
}
texturedata.lockedrect = *rect;
texturedata.lockedbuffer = lockedbuffer;
*pixels = [lockedbuffer contents];
/* METAL_TextureData.lockedbuffer retains. */
#if !__has_feature(objc_arc)
[lockedbuffer release];
#endif
return 0;
}}
static void
METAL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{ @autoreleasepool {
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;
}
if (data.mtlcmdencoder != nil) {
[data.mtlcmdencoder endEncoding];
data.mtlcmdencoder = nil;
}
if (data.mtlcmdbuffer == nil) {
data.mtlcmdbuffer = [data.mtlcmdqueue commandBuffer];
}
id<MTLBlitCommandEncoder> blitcmd = [data.mtlcmdbuffer blitCommandEncoder];
[blitcmd copyFromBuffer:texturedata.lockedbuffer
sourceOffset:0
sourceBytesPerRow:pitch
sourceBytesPerImage:0
sourceSize:MTLSizeMake(rect.w, rect.h, 1)
toTexture:texturedata.mtltexture
destinationSlice:0
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];
data.mtlcmdbuffer = nil;
texturedata.lockedbuffer = nil; /* Retained property, so it calls release. */
texturedata.hasdata = YES;
}}
static void
METAL_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture, SDL_ScaleMode scaleMode)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
METAL_TextureData *texturedata = (__bridge METAL_TextureData *)texture->driverdata;
if (scaleMode == SDL_ScaleModeNearest) {
texturedata.mtlsampler = data.mtlsamplernearest;
} else {
texturedata.mtlsampler = data.mtlsamplerlinear;
}
}}