OpenCL到OpenGL纹理问题

我正在尝试使用OpenCL绘制到我从OpenGL纹理获得的cl_image，然后渲染该纹理。 问题是当我在CL_DEVICE_TYPE_CPU上运行我的代码时，它工作正常但是当我在CL_DEVICE_TYPE_GPU上运行时，纹理似乎是一些随机像素。 我是OpenCL的新手，不知道发生了什么，所以我将在下面发布代码，也在OSX上使用OpenCL。

主机代码：

#import "GLView.h" #import  #import  #import "kernel.cl.h" #define WIDTH 500 #define HEIGHT 500 static GLfloat squareVertexData[] = { -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.5f, 0.5f, 0.0f, 1.0f, 1.0f, -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 0.5f, 0.5f, 0.0f, 1.0f, 1.0f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f }; @interface GLView () @property (strong, nonatomic) GLKBaseEffect *effect; @property (nonatomic) GLuint vertexArray; @property (nonatomic) GLuint vertexBuffer; @property (nonatomic) GLuint tex; @property (nonatomic) cl_image clImage; @property (nonatomic) dispatch_queue_t queue; @end @implementation GLView #pragma mark - Lifecycle methods - (void)awakeFromNib { NSOpenGLPixelFormatAttribute attrs[] = { NSOpenGLPFADoubleBuffer, NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core, NSOpenGLPFAColorSize, 8, NSOpenGLPFAAlphaSize, 8, 0 }; NSOpenGLPixelFormat *pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs]; [self setPixelFormat:pixelFormat]; NSOpenGLContext *context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil]; CGLEnable([context CGLContextObj], kCGLCECrashOnRemovedFunctions); [self setOpenGLContext:context]; } - (void)dealloc { [self.openGLContext makeCurrentContext]; glDeleteBuffers(1, &_vertexBuffer); glDeleteVertexArrays(1, &_vertexArray); glDeleteTextures(1, &_tex); gcl_release_image(self.clImage); } #pragma mark - NSOpenGLView methods - (void)prepareOpenGL { GLint swapInterval = 1; [self.openGLContext setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval]; glGenVertexArrays(1, &_vertexArray); glBindVertexArray(self.vertexArray); glGenBuffers(1, &_vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(squareVertexData), squareVertexData, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 20, (char *)NULL + (0)); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 20, (char *)NULL + (12)); glBindVertexArray(0); self.effect = [[GLKBaseEffect alloc] init]; self.effect.transform.projectionMatrix = GLKMatrix4MakeOrtho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f); glGenTextures(1, &_tex); glBindTexture(GL_TEXTURE_2D, self.tex); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); self.effect.texture2d0.name = self.tex; CGLShareGroupObj sharegroup = CGLGetShareGroup(self.openGLContext.CGLContextObj); gcl_gl_set_sharegroup(sharegroup); self.clImage = gcl_gl_create_image_from_texture(GL_TEXTURE_2D, 0, self.tex); self.queue = gcl_create_dispatch_queue(CL_DEVICE_TYPE_GPU, NULL); dispatch_sync(self.queue, ^{ cl_ndrange range = { 2, { 0 }, { WIDTH, HEIGHT }, { 0 } }; mykernel_kernel(&range, self.clImage); }); glClearColor(0.65f, 0.65f, 0.65f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); glBindVertexArray(self.vertexArray); [self.effect prepareToDraw]; glDrawArrays(GL_TRIANGLES, 0, 6); glBindVertexArray(0); [self.openGLContext flushBuffer]; } @end 

内核代码：

 kernel void mykernel(write_only image2d_t image) { size_t x = get_global_id(0); size_t y = get_global_id(1); uint4 color; color.x = 255; color.w = 255; write_imageui(image, (int2) (x,y), color); } 

Answer 1

我不清楚你为什么要求：

  NSOpenGLPFAColorSize, 8, 

这似乎不是很多颜色。 如果要求32位（每像素8个，加上结束时的alpha？），它可能会更好用：

  NSOpenGLPFAColorSize, 32, 

无论如何，这是Scene Kit创建的默认设置。