2018-06-15 09:58:33 +00:00
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#import "GBViewMetal.h"
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static const vector_float2 rect[] =
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{
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{-1, -1},
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{ 1, -1},
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{-1, 1},
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{ 1, 1},
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};
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@implementation GBViewMetal
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{
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id<MTLDevice> device;
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id<MTLTexture> texture, previous_texture;
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id<MTLBuffer> vertices;
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id<MTLRenderPipelineState> pipeline_state;
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id<MTLCommandQueue> command_queue;
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2018-06-15 10:58:50 +00:00
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id<MTLBuffer> mix_previous_buffer;
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2018-06-15 15:44:22 +00:00
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id<MTLBuffer> output_resolution_buffer;
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vector_float2 output_resolution;
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2018-06-15 09:58:33 +00:00
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}
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2018-06-15 17:03:59 +00:00
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+ (bool)isSupported
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{
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if (MTLCopyAllDevices) {
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return [MTLCopyAllDevices() count];
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}
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return false;
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}
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2018-11-14 22:21:21 +00:00
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- (void) allocateTextures
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2018-06-15 09:58:33 +00:00
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{
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2018-11-14 22:21:21 +00:00
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if (!device) return;
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if (!self.gb) return;
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2018-06-15 09:58:33 +00:00
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MTLTextureDescriptor *texture_descriptor = [[MTLTextureDescriptor alloc] init];
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texture_descriptor.pixelFormat = MTLPixelFormatRGBA8Unorm;
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2018-11-14 22:21:21 +00:00
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texture_descriptor.width = GB_get_screen_width(self.gb);
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texture_descriptor.height = GB_get_screen_height(self.gb);
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2018-06-15 09:58:33 +00:00
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texture = [device newTextureWithDescriptor:texture_descriptor];
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previous_texture = [device newTextureWithDescriptor:texture_descriptor];
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2018-11-14 22:21:21 +00:00
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}
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- (void)screenSizeChanged
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{
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[super screenSizeChanged];
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[self allocateTextures];
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}
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- (void)createInternalView
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{
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MTKView *view = [[MTKView alloc] initWithFrame:self.frame device:(device = MTLCreateSystemDefaultDevice())];
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view.delegate = self;
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self.internalView = view;
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view.paused = YES;
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[self allocateTextures];
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2018-06-15 09:58:33 +00:00
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vertices = [device newBufferWithBytes:rect
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length:sizeof(rect)
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options:MTLResourceStorageModeShared];
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2018-06-15 10:58:50 +00:00
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static const bool default_mix_value = false;
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mix_previous_buffer = [device newBufferWithBytes:&default_mix_value
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length:sizeof(default_mix_value)
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options:MTLResourceStorageModeShared];
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2018-06-15 16:11:06 +00:00
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output_resolution_buffer = [device newBufferWithBytes:&output_resolution
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length:sizeof(output_resolution)
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2018-06-15 15:44:22 +00:00
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options:MTLResourceStorageModeShared];
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2018-06-16 09:46:57 +00:00
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output_resolution = (simd_float2){view.drawableSize.width, view.drawableSize.height};
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2018-06-15 16:11:06 +00:00
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadShader) name:@"GBFilterChanged" object:nil];
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2018-06-15 09:58:33 +00:00
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[self loadShader];
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}
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- (void) loadShader
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{
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NSError *error = nil;
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NSString *shader_source = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MasterShader"
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ofType:@"metal"
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inDirectory:@"Shaders"]
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encoding:NSUTF8StringEncoding
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error:nil];
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2018-06-15 16:11:06 +00:00
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NSString *shader_name = [[NSUserDefaults standardUserDefaults] objectForKey:@"GBFilter"];
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NSString *scaler_source = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:shader_name
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ofType:@"fsh"
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inDirectory:@"Shaders"]
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encoding:NSUTF8StringEncoding
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error:nil];
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shader_source = [shader_source stringByReplacingOccurrencesOfString:@"{filter}"
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withString:scaler_source];
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2018-06-15 21:08:24 +00:00
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MTLCompileOptions *options = [[MTLCompileOptions alloc] init];
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options.fastMathEnabled = YES;
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2018-06-15 09:58:33 +00:00
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id<MTLLibrary> library = [device newLibraryWithSource:shader_source
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2018-06-15 21:08:24 +00:00
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options:options
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2018-06-15 09:58:33 +00:00
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error:&error];
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if (error) {
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NSLog(@"Error: %@", error);
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2018-06-15 16:11:06 +00:00
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if (!library) {
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return;
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}
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2018-06-15 09:58:33 +00:00
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}
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id<MTLFunction> vertex_function = [library newFunctionWithName:@"vertex_shader"];
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id<MTLFunction> fragment_function = [library newFunctionWithName:@"fragment_shader"];
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// Set up a descriptor for creating a pipeline state object
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MTLRenderPipelineDescriptor *pipeline_state_descriptor = [[MTLRenderPipelineDescriptor alloc] init];
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pipeline_state_descriptor.vertexFunction = vertex_function;
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pipeline_state_descriptor.fragmentFunction = fragment_function;
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pipeline_state_descriptor.colorAttachments[0].pixelFormat = ((MTKView *)self.internalView).colorPixelFormat;
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error = nil;
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pipeline_state = [device newRenderPipelineStateWithDescriptor:pipeline_state_descriptor
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error:&error];
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if (error) {
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NSLog(@"Failed to created pipeline state, error %@", error);
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2018-06-15 16:11:06 +00:00
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return;
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2018-06-15 09:58:33 +00:00
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}
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command_queue = [device newCommandQueue];
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}
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- (void)mtkView:(nonnull MTKView *)view drawableSizeWillChange:(CGSize)size
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{
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2018-06-15 15:44:22 +00:00
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output_resolution = (vector_float2){size.width, size.height};
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2018-10-11 15:43:31 +00:00
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dispatch_async(dispatch_get_main_queue(), ^{
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[(MTKView *)self.internalView draw];
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});
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2018-06-15 09:58:33 +00:00
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}
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- (void)drawInMTKView:(nonnull MTKView *)view
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{
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2018-10-11 15:43:31 +00:00
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if (!(view.window.occlusionState & NSWindowOcclusionStateVisible)) return;
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2018-11-14 22:21:21 +00:00
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MTLRegion region = {
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{0, 0, 0}, // MTLOrigin
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{texture.width, texture.height, 1} // MTLSize
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};
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2018-06-15 09:58:33 +00:00
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[texture replaceRegion:region
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mipmapLevel:0
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withBytes:[self currentBuffer]
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2018-11-14 22:21:21 +00:00
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bytesPerRow:texture.width * 4];
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2018-06-15 10:58:50 +00:00
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if ([self shouldBlendFrameWithPrevious]) {
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[previous_texture replaceRegion:region
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mipmapLevel:0
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withBytes:[self previousBuffer]
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2018-11-14 22:21:21 +00:00
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bytesPerRow:texture.width * 4];
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2018-06-15 10:58:50 +00:00
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}
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2018-06-15 09:58:33 +00:00
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MTLRenderPassDescriptor *render_pass_descriptor = view.currentRenderPassDescriptor;
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id<MTLCommandBuffer> command_buffer = [command_queue commandBuffer];
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if(render_pass_descriptor != nil)
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{
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2018-06-15 10:58:50 +00:00
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*(bool *)[mix_previous_buffer contents] = [self shouldBlendFrameWithPrevious];
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2018-06-15 15:44:22 +00:00
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*(vector_float2 *)[output_resolution_buffer contents] = output_resolution;
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2018-06-15 09:58:33 +00:00
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id<MTLRenderCommandEncoder> render_encoder =
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[command_buffer renderCommandEncoderWithDescriptor:render_pass_descriptor];
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[render_encoder setViewport:(MTLViewport){0.0, 0.0,
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2018-06-15 15:44:22 +00:00
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output_resolution.x,
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output_resolution.y,
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2018-06-15 09:58:33 +00:00
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-1.0, 1.0}];
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[render_encoder setRenderPipelineState:pipeline_state];
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[render_encoder setVertexBuffer:vertices
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offset:0
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atIndex:0];
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2018-06-15 10:58:50 +00:00
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[render_encoder setFragmentBuffer:mix_previous_buffer
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offset:0
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atIndex:0];
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2018-06-15 15:44:22 +00:00
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[render_encoder setFragmentBuffer:output_resolution_buffer
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offset:0
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atIndex:1];
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2018-06-15 09:58:33 +00:00
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[render_encoder setFragmentTexture:texture
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atIndex:0];
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2018-06-15 10:58:50 +00:00
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[render_encoder setFragmentTexture:previous_texture
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atIndex:1];
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2018-06-15 09:58:33 +00:00
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[render_encoder drawPrimitives:MTLPrimitiveTypeTriangleStrip
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vertexStart:0
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vertexCount:4];
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[render_encoder endEncoding];
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[command_buffer presentDrawable:view.currentDrawable];
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}
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[command_buffer commit];
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}
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2018-10-11 15:43:31 +00:00
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- (void)flip
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{
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[super flip];
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dispatch_async(dispatch_get_main_queue(), ^{
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[(MTKView *)self.internalView draw];
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});
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}
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2018-06-15 09:58:33 +00:00
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@end
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