Initial Metal example

examples/CMakeLists.txt

@@ -41,6 +41,13 @@ add_executable(wave WIN32 MACOSX_BUNDLE wave.c ${ICON} ${GLAD})
 
 target_link_libraries(particles "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
 
+if (APPLE)
+    add_executable(metal MACOSX_BUNDLE metal.m ${ICON})
+    target_compile_options(metal PUBLIC "-fobjc-arc")
+    target_link_libraries(metal "-framework Metal" "-framework QuartzCore")
+    set_target_properties(metal PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Metal")
+endif()
+
 set(WINDOWS_BINARIES boing gears heightmap particles simple splitview wave)
 set(CONSOLE_BINARIES offscreen)
 
@@ -57,6 +64,7 @@ if (APPLE)
     set_target_properties(boing PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Boing")
     set_target_properties(gears PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Gears")
     set_target_properties(heightmap PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Heightmap")
+    set_target_properties(metal PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Metal")
     set_target_properties(particles PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Particles")
     set_target_properties(simple PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Simple")
     set_target_properties(splitview PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "SplitView")

examples/metal.m

@@ -0,0 +1,167 @@
+//========================================================================
+// Simple GLFW+Metal example
+// Copyright (c) Camilla Berglund <elmindreda@elmindreda.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.
+//
+//========================================================================
+//! [code]
+
+#import <Metal/Metal.h>
+#import <QuartzCore/QuartzCore.h>
+#import <simd/simd.h>
+
+#define GLFW_INCLUDE_NONE
+#import <GLFW/glfw3.h>
+#define GLFW_EXPOSE_NATIVE_COCOA
+#define GLFW_EXPOSE_NATIVE_NSGL
+#import <GLFW/glfw3native.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static void error_callback(int error, const char* description)
+{
+    fputs(description, stderr);
+}
+
+static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, GLFW_TRUE);
+}
+
+int main(void)
+{
+	id<MTLDevice> device = MTLCreateSystemDefaultDevice();
+	if (!device)
+	{
+		exit(EXIT_FAILURE);
+	}
+
+    GLFWwindow* window;
+
+    glfwSetErrorCallback(error_callback);
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+    window = glfwCreateWindow(640, 480, "Metal Example", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    NSWindow *nswin = glfwGetCocoaWindow(window);
+    CAMetalLayer *layer = [CAMetalLayer layer];
+    layer.device = device;
+    layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
+    nswin.contentView.layer = layer;
+    nswin.contentView.wantsLayer = YES;
+
+    MTLCompileOptions *compileOptions = [MTLCompileOptions new];
+    compileOptions.languageVersion = MTLLanguageVersion1_1;
+    NSError *compileError;
+    id<MTLLibrary> lib = [device newLibraryWithSource:
+       @"#include <metal_stdlib>\n"
+        "using namespace metal;\n"
+        "vertex float4 v_simple(\n"
+        "    constant float4 *in  [[buffer(0)]],\n"
+        "    uint             vid [[vertex_id]])\n"
+        "{\n"
+        "    return in[vid];\n"
+        "}\n"
+        "fragment float4 f_simple(\n"
+        "    float4 in [[stage_in]])\n"
+        "{\n"
+        "    return float4(1, 0, 0, 1);\n"
+        "}\n"
+       options:compileOptions error:&compileError];
+    if (!lib)
+    {
+        NSLog(@"can't create library: %@", compileError);
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    id<MTLFunction> vs = [lib newFunctionWithName:@"v_simple"];
+    assert(vs);
+    id<MTLFunction> fs = [lib newFunctionWithName:@"f_simple"];
+    assert(fs);
+
+    id<MTLCommandQueue> cq = [device newCommandQueue];
+    assert(cq);
+
+    MTLRenderPipelineDescriptor *rpd = [MTLRenderPipelineDescriptor new];
+    rpd.vertexFunction = vs;
+    rpd.fragmentFunction = fs;
+    rpd.colorAttachments[0].pixelFormat = layer.pixelFormat;
+    id<MTLRenderPipelineState> rps = [device newRenderPipelineStateWithDescriptor:rpd error:NULL];
+    assert(rps);
+
+    glfwSetKeyCallback(window, key_callback);
+
+    while (!glfwWindowShouldClose(window))
+    {
+        float ratio;
+        int width, height;
+
+        glfwGetFramebufferSize(window, &width, &height);
+        ratio = width / (float) height;
+
+        layer.drawableSize = CGSizeMake(width, height);
+        id<CAMetalDrawable> drawable = [layer nextDrawable];
+        assert(drawable);
+
+        id<MTLCommandBuffer> cb = [cq commandBuffer];
+
+        MTLRenderPassDescriptor *rpd = [MTLRenderPassDescriptor new];
+        MTLRenderPassColorAttachmentDescriptor *cd = rpd.colorAttachments[0];
+        cd.texture = drawable.texture;
+        cd.loadAction = MTLLoadActionClear;
+        cd.clearColor = MTLClearColorMake(1.0, 1.0, 1.0, 1.0);
+        cd.storeAction = MTLStoreActionStore;
+        id<MTLRenderCommandEncoder> rce = [cb renderCommandEncoderWithDescriptor:rpd];
+
+        [rce setRenderPipelineState:rps];
+        [rce setVertexBytes:(vector_float4[]){
+            { 0, 0, 0, 1 },
+            { -1, 1, 0, 1 },
+            { 1, 1, 0, 1 },
+        } length:3 * sizeof(vector_float4) atIndex:0];
+        [rce drawPrimitives:MTLPrimitiveTypeTriangle vertexStart:0 vertexCount:3];
+
+        [rce endEncoding];
+        [cb presentDrawable:drawable];
+        [cb commit];
+
+        glfwPollEvents();
+    }
+
+    glfwDestroyWindow(window);
+
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}
+
+//! [code]