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April 20, 2016 01:53
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OpenGL ES绘制底图+点击添加小图块
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| // | |
| // OpenGLView.m | |
| #import "OpenGLView.h" | |
| #import <OpenGLES/ES2/gl.h> | |
| #import <OpenGLES/ES2/glext.h> | |
| #import <QuartzCore/QuartzCore.h> | |
| #import "Utils+OpenGL.h" | |
| const GLfloat Vertices[] = { | |
| 1, 1, 0, // 右下，红色 | |
| 1, -1, 0,// 左下，黑色 | |
| -1, 1, 0, // 左上，蓝色 | |
| -1, -1, 0 | |
| }; | |
| // 颜色数组 | |
| const GLfloat Colors[] = { | |
| 0,0,0,1, // 左下，黑色 | |
| 1,0,0,1, // 右下，红色 | |
| 0,0,1,1, // 左上，蓝色 | |
| 1,0,0,1 | |
| }; | |
| @interface OpenGLView() { | |
| EAGLContext *_context; | |
| CAEAGLLayer *_layer; | |
| GLuint _renderColorbuffer; | |
| GLuint _frameBuffer; | |
| GLuint _positionSlot; | |
| GLuint _colorSlot; | |
| // tex | |
| // GLuint _textureSlot; | |
| // GLuint _textureCoordsSlot; | |
| // GLuint _textureId; | |
| } | |
| @end | |
| @implementation OpenGLView | |
| - (instancetype)initWithFrame:(CGRect)frame { | |
| if (self = [super initWithFrame:frame]) { | |
| self.backgroundColor = [UIColor whiteColor]; | |
| [self setupLayer]; | |
| [self setupContext]; | |
| [self setupRenderbuffer]; | |
| [self setupFramebuffer]; | |
| [self setupVBOs]; | |
| [self compileShaders]; | |
| // glEnable(GL_BLEND); | |
| // glBlendFunc(<#GLenum sfactor#>, <#GLenum dfactor#>) | |
| [self render]; | |
| } | |
| return self; | |
| } | |
| + (Class)layerClass { | |
| return [CAEAGLLayer class]; | |
| } | |
| #pragma mark setup | |
| - (void)setupLayer { | |
| _layer = (CAEAGLLayer *) self.layer; | |
| _layer.opaque = YES; | |
| } | |
| - (void)setupContext { | |
| _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; | |
| if (!_context) { | |
| NSLog(@"setup context fail."); | |
| exit(1); | |
| } | |
| if (![EAGLContext setCurrentContext:_context]) { | |
| NSLog(@"setup context fail."); | |
| exit(1); | |
| } | |
| } | |
| - (void)setupRenderbuffer { | |
| glGenRenderbuffers(1, &_renderColorbuffer); | |
| glBindRenderbuffer(GL_RENDERBUFFER, _renderColorbuffer); | |
| [_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:_layer]; | |
| } | |
| - (void)setupFramebuffer { | |
| glGenFramebuffers(1, &_frameBuffer); | |
| glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer); | |
| glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _renderColorbuffer); | |
| } | |
| - (void)setupVBOs { | |
| // GLuint vertexBuffer; | |
| // glGenBuffers(1, &vertexBuffer); | |
| // glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); | |
| // glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW); | |
| // | |
| // GLuint indexBuffer; | |
| // glGenBuffers(1, &indexBuffer); | |
| // glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); | |
| // glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices), Indices, GL_STATIC_DRAW); | |
| } | |
| - (void)compileShaders { | |
| GLuint vertexShader = [Utils compileShader:@"VertexShader_ShowImage" | |
| withType:GL_VERTEX_SHADER]; | |
| GLuint fragmentShader = [Utils compileShader:@"FragmentShader_ShowImage" | |
| withType:GL_FRAGMENT_SHADER]; | |
| GLuint programHandle = glCreateProgram(); | |
| glAttachShader(programHandle, vertexShader); | |
| glAttachShader(programHandle, fragmentShader); | |
| glLinkProgram(programHandle); | |
| glUseProgram(programHandle); | |
| _positionSlot = glGetAttribLocation(programHandle, "Position"); | |
| _colorSlot = glGetAttribLocation(programHandle, "SourceColor"); | |
| GLint linkSuccess; | |
| glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess); | |
| if (linkSuccess == GL_FALSE) { | |
| GLchar messages[256]; | |
| glGetProgramInfoLog(programHandle, sizeof(messages), 0, &messages[0]); | |
| NSString *messageString = [NSString stringWithUTF8String:messages]; | |
| NSLog(@"%@", messageString); | |
| exit(1); | |
| } | |
| glEnableVertexAttribArray(_positionSlot); | |
| glEnableVertexAttribArray(_colorSlot); | |
| } | |
| - (void)render { | |
| glClearColor(0, 104.0/255.0, 55.0/255.0, 1.0); | |
| glClear(GL_COLOR_BUFFER_BIT); | |
| glViewport(0, 100, self.frame.size.width, self.frame.size.width - 200); | |
| glVertexAttribPointer(_colorSlot, 4, GL_FLOAT, GL_FALSE, 0, Colors); | |
| glVertexAttribPointer(_positionSlot, 3, GL_FLOAT, GL_FALSE, 0, Vertices); | |
| glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); | |
| [_context presentRenderbuffer:GL_RENDERBUFFER]; | |
| } | |
| - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { | |
| CGPoint point = [[touches anyObject] locationInView:self]; | |
| glViewport(point.x, CGRectGetHeight(self.frame) - point.y, 20, 20); | |
| // 取出Colors数组中的每个坐标点的颜色值，赋给_colorSlot | |
| glVertexAttribPointer(_colorSlot, 4, GL_FLOAT, GL_FALSE, 0, Colors); | |
| glVertexAttribPointer(_positionSlot, 3, GL_FLOAT, GL_FALSE, 0, Vertices); | |
| glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); | |
| [_context presentRenderbuffer:GL_RENDERBUFFER]; | |
| } | |
| @end |
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