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Enable building the Metal renderer by default, and weak link the Metal framework so the SDL library is safe to use on older Macs

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Also generate iOS versions of the Metal shaders
This commit is contained in:
Sam Lantinga
2017-12-07 16:08:09 -08:00
parent 2a2c8d42ca
commit b2859af6df
6 changed files with 143 additions and 849 deletions
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42
src/render/metal/SDL_render_metal.m
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@@ -1,6 +1,6 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
Copyright (C) 1997-2017 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
@@ -32,10 +32,12 @@
#include <Metal/Metal.h>
#include <QuartzCore/CAMetalLayer.h>
// these are in SDL_shaders_metal.c, regenerate it with build-metal-shaders.sh
extern const unsigned char sdl_metallib[];
extern const unsigned int sdl_metallib_len;
/* Regenerate these with build-metal-shaders.sh */
#ifdef __MACOSX__
#include "SDL_shaders_metal_osx.h"
#else
#include "SDL_shaders_metal_ios.h"
#endif
/* Apple Metal renderer implementation */
@@ -141,10 +143,6 @@ MakePipelineState(METAL_RenderData *data, NSString *label, NSString *vertfn,
mtlpipedesc.colorAttachments[0].pixelFormat = data->mtlbackbuffer.texture.pixelFormat;
switch (blendmode) {
case SDL_BLENDMODE_NONE:
mtlpipedesc.colorAttachments[0].blendingEnabled = NO;
break;
case SDL_BLENDMODE_BLEND:
mtlpipedesc.colorAttachments[0].blendingEnabled = YES;
mtlpipedesc.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;
@@ -174,6 +172,10 @@ MakePipelineState(METAL_RenderData *data, NSString *label, NSString *vertfn,
mtlpipedesc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorZero;
mtlpipedesc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOne;
break;
default:
mtlpipedesc.colorAttachments[0].blendingEnabled = NO;
break;
}
mtlpipedesc.label = label;
@@ -204,10 +206,10 @@ static inline id<MTLRenderPipelineState>
ChoosePipelineState(id<MTLRenderPipelineState> *states, const SDL_BlendMode blendmode)
{
switch (blendmode) {
case SDL_BLENDMODE_NONE: return states[0];
case SDL_BLENDMODE_BLEND: return states[1];
case SDL_BLENDMODE_ADD: return states[2];
case SDL_BLENDMODE_MOD: return states[3];
default: return states[0];
}
return nil;
}
@@ -244,8 +246,9 @@ METAL_CreateRenderer(SDL_Window * window, Uint32 flags)
renderer->driverdata = data;
renderer->window = window;
data->mtldevice = MTLCreateSystemDefaultDevice(); // !!! FIXME: MTLCopyAllDevices() can find other GPUs...
if (data->mtldevice == nil) {
#ifdef __MACOSX__
id<MTLDevice> mtldevice = MTLCreateSystemDefaultDevice(); // !!! FIXME: MTLCopyAllDevices() can find other GPUs...
if (mtldevice == nil) {
SDL_free(renderer);
SDL_free(data);
SDL_SetError("Failed to obtain Metal device");
@@ -256,10 +259,10 @@ METAL_CreateRenderer(SDL_Window * window, Uint32 flags)
NSView *nsview = [syswm.info.cocoa.window contentView];
// !!! FIXME: on iOS, we need to override +[UIView layerClass] to return [CAMetalLayer class] right from the start, and that's more complicated.
CAMetalLayer *layer = [CAMetalLayer layer];
// CAMetalLayer is available in QuartzCore starting at OSX 10.11
CAMetalLayer *layer = [NSClassFromString( @"CAMetalLayer" ) layer];
layer.device = data->mtldevice;
layer.device = mtldevice;
//layer.pixelFormat = MTLPixelFormatBGRA8Unorm; // !!! FIXME: MTLPixelFormatBGRA8Unorm_sRGB ?
layer.framebufferOnly = YES;
//layer.drawableSize = (CGSize) [nsview convertRectToBacking:[nsview bounds]].size;
@@ -269,6 +272,11 @@ METAL_CreateRenderer(SDL_Window * window, Uint32 flags)
[nsview setLayer:layer];
[layer retain];
#else
#endif
data->mtldevice = layer.device;
data->mtllayer = layer;
data->mtlcmdqueue = [data->mtldevice newCommandQueue];
data->mtlcmdqueue.label = @"SDL Metal Renderer";
@@ -318,8 +326,8 @@ METAL_CreateRenderer(SDL_Window * window, Uint32 flags)
NSError *err = nil;
// The compiled .metallib is embedded in a static array in SDL_shaders_metal.c,
// but the original shader source code is in SDL_shaders_metal.metal.
// The compiled .metallib is embedded in a static array in a header file
// but the original shader source code is in SDL_shaders_metal.metal.
dispatch_data_t mtllibdata = dispatch_data_create(sdl_metallib, sdl_metallib_len, dispatch_get_global_queue(0, 0), ^{});
data->mtllibrary = [data->mtldevice newLibraryWithData:mtllibdata error:&err];
SDL_assert(err == nil);