example_mtl.m File Reference

#include <assert.h>
#include <stdio.h>
#include "GLFW/glfw3.h"
import "GLFW/glfw3native.h"
#include "impeller.h"
#include <AppKit/AppKit.h>
#include <Metal/Metal.h>
#include <QuartzCore/QuartzCore.h>

Go to the source code of this file.

Macros
#define	GLFW_INCLUDE_NONE
#define	GLFW_EXPOSE_NATIVE_COCOA

Functions
void	GLFWErrorCallback (int error, const char *description)
int	main (int argc, char const *argv[])

Macro Definition Documentation

GLFW_EXPOSE_NATIVE_COCOA

#define GLFW_EXPOSE_NATIVE_COCOA

Definition at line 10 of file example_mtl.m.

GLFW_INCLUDE_NONE

#define GLFW_INCLUDE_NONE

Definition at line 8 of file example_mtl.m.

Function Documentation

GLFWErrorCallback()

void GLFWErrorCallback	(	int	error,
		const char *	description
	)

Definition at line 19 of file example_mtl.m.

                                                           {
  // NOLINTNEXTLINE(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling)
  fprintf(stderr, "GLFW Error (%d): %s\n", error, description);
  fflush(stderr);
}

References error.

Referenced by main().

main()

int main	(	int	argc,
		char const *	argv[]
	)

Definition at line 25 of file example_mtl.m.

                                       {
  glfwSetErrorCallback(GLFWErrorCallback);
  [[maybe_unused]] int result = glfwInit();
  assert(result == GLFW_TRUE);
 
  if (glfwGetPlatform() != GLFW_PLATFORM_COCOA) {
    // NOLINTNEXTLINE(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling)
    fprintf(stderr,
            "Metal is only available on macOS. Please try either Vulkan or "
            "OpenGL (ES).\n");
    fflush(stderr);
    return -1;
  }
 
  glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
 
  GLFWwindow* window =
      glfwCreateWindow(800, 600, "Impeller Example (Metal)", NULL, NULL);
  assert(window != NULL);
 
  int framebuffer_width, framebuffer_height;
  glfwGetFramebufferSize(window, &framebuffer_width, &framebuffer_height);
 
  ImpellerContext context = ImpellerContextCreateMetalNew(IMPELLER_VERSION);
  assert(context != NULL);
 
  // This example assumes Automatic Reference Counting (ARC) in Objective-C is
  // enabled.
  NSWindow* cocoa_window = glfwGetCocoaWindow(window);
  assert(cocoa_window != NULL);
  CAMetalLayer* layer = [CAMetalLayer layer];
  layer.framebufferOnly = NO;
  layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
  layer.device = MTLCreateSystemDefaultDevice();
  cocoa_window.contentView.layer = layer;
  cocoa_window.contentView.wantsLayer = YES;
 
  ImpellerDisplayList dl = NULL;
 
  {
    ImpellerDisplayListBuilder builder = ImpellerDisplayListBuilderNew(NULL);
    ImpellerPaint paint = ImpellerPaintNew();
 
    // Clear the background to a white color.
    ImpellerColor clear_color = {1.0, 1.0, 1.0, 1.0};
    ImpellerPaintSetColor(paint, &clear_color);
    ImpellerDisplayListBuilderDrawPaint(builder, paint);
 
    // Draw a red box.
    ImpellerColor box_color = {1.0, 0.0, 0.0, 1.0};
    ImpellerPaintSetColor(paint, &box_color);
    ImpellerRect box_rect = {10, 10, 100, 100};
    ImpellerDisplayListBuilderDrawRect(builder, &box_rect, paint);
 
    dl = ImpellerDisplayListBuilderCreateDisplayListNew(builder);
 
    ImpellerPaintRelease(paint);
    ImpellerDisplayListBuilderRelease(builder);
  }
 
  assert(dl != NULL);
 
  while (!glfwWindowShouldClose(window)) {
    glfwWaitEvents();
 
    // React to window resizes.
    layer.drawableSize = layer.bounds.size;
 
    ImpellerSurface surface = ImpellerSurfaceCreateWrappedMetalDrawableNew(
        context, (__bridge void*)layer.nextDrawable);
    assert(surface != NULL);
    ImpellerSurfaceDrawDisplayList(surface, dl);
    ImpellerSurfacePresent(surface);
    ImpellerSurfaceRelease(surface);
  }
 
  ImpellerDisplayListRelease(dl);
  ImpellerContextRelease(context);
 
  glfwMakeContextCurrent(NULL);
 
  glfwDestroyWindow(window);
 
  glfwTerminate();
  return 0;
}

References GLFW_TRUE, GLFWErrorCallback(), IMPELLER_VERSION, ImpellerContextCreateMetalNew(), ImpellerContextRelease(), ImpellerDisplayListBuilderCreateDisplayListNew(), ImpellerDisplayListBuilderDrawPaint(), ImpellerDisplayListBuilderDrawRect(), ImpellerDisplayListBuilderNew(), ImpellerDisplayListBuilderRelease(), ImpellerDisplayListRelease(), ImpellerPaintNew(), ImpellerPaintRelease(), ImpellerPaintSetColor(), ImpellerSurfaceCreateWrappedMetalDrawableNew(), ImpellerSurfaceDrawDisplayList(), ImpellerSurfacePresent(), ImpellerSurfaceRelease(), surface, and window.