Question

我的应用程序（ios8.0）是使用Opengl-es在GLKViewController中呈现流式视频

我遇到横向模式时视频被剪切的问题

问题捕获：http://i.stack.imgur.com/3SrpF.png

也许..我需要缩放纹理，使用顶点着色器。

typedef struct {
    float Position[3];
    float Color[4];
    float TexCoordp[2];
} Vertex;

const Vertex Vertices[] = {
    {{1, -1, 0}, {1, 1, 1, 1}, {1, 1}},
    {{1, 1, 0}, {1, 1, 1, 1}, {1, 0}},
    {{-1, 1, 0}, {1, 1, 1, 1}, {0, 0}},
    {{-1, -1, 0}, {1, 1, 1, 1}, {0, 1}}
};

const GLubyte Indices[] = {
    0, 1, 2,
    2, 3, 0
};

#pragma mark - shaders

#define STRINGIZE(x) #x
#define STRINGIZE2(x) STRINGIZE(x)
#define SHADER_STRING(text) @ STRINGIZE2(text)

NSString *const vertexShaderString = SHADER_STRING
(
 attribute vec4 Position; // 1
 attribute vec4 SourceColor; // 2

 varying vec4 DestinationColor; // 3

 attribute vec2 TexCoordIn;
 varying vec2 TexCoordOut;

 void main(void) { // 4
     DestinationColor = SourceColor; // 5
     gl_Position = Position; // 6
     TexCoordOut = TexCoordIn; // New
 }
 );

设置GL代码

- (void)setupGL
{

    [EAGLContext setCurrentContext:self.context];

    glGenBuffers(1, &_vertexBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW);

    glGenBuffers(1, &_indexBuffer);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices), Indices, GL_STATIC_DRAW);

    // init the update render semaphore
    _textureUpdateRenderSemaphore = dispatch_semaphore_create((long)1);

}

也许我需要改变“顶点”，但我无法得到任何线索。

非常感谢你的帮助

IOS OpenGLES，视频在横向模式下被剪切

0 个答案: