OpenGL使用着色器将NV12转换为RGB24

我试图编写一个应用程序来在OpenGL中显示YUV图像。在C++中，使用此片段成功地将YUV转换为RGB（）

但我得到的只是绿色和粉色的像素。我是OpenGL的新手。有人能指出我可能错在哪里吗？谢谢你的帮助

更新：添加加载纹理的代码

FILE fp = fopen("nv21.raw", "rb");
unsigned char *yuvBuffer = new unsigned char[width*height*3/2];
fread(yuvBuffer, 1, width*height*3/2, fp);

unsigned char *vuBuffer = &yuvBuffer[width*height];

int bufSize = width*height/4;
unsigned char *uBuffer = new unsigned char[bufSize];
memset(uBuffer, 0, bufSize);
unsigned char *vBuffer = new unsigned char[bufSize];
memset(vBuffer, 0, bufSize);

unsigned char *uPtr, *vPtr;
uPtr = uBuffer;
vPtr = vBuffer;

for (int i = 0; i < bufSize; i++)
{
    *vPtr = *vuBuffer++;
    *uPtr = *vuBuffer++;
}

GLuint textureID[3];

glGenTextures(1, &textureID[0]);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, &yuvBuffer[0]);
glBindTexture(0);

glGenTextures(1, &textureID[1]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textureID[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height/2, 0, GL_RED, GL_UNSIGNED_BYTE, uBuffer);
glBindTexture(0);

glGenTextures(1, &textureID[2]);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, textureID[2]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height/2, 0, GL_RED, GL_UNSIGNED_BYTE, vBuffer);
glBindTexture(0);

文件fp=fopen（“nv21.raw”、“rb”）；
无符号字符*yuvBuffer=新的无符号字符[宽度*高度*3/2]；
fread（yuvBuffer，1，宽*高*3/2，fp）；
无符号字符*Vubffer=&yuvBuffer[width*height]；
int bufSize=宽度*高度/4；
unsigned char*uBuffer=新的unsigned char[bufSize]；
memset（uBuffer，0，bufSize）；
unsigned char*vBuffer=新的unsigned char[bufSize]；
memset（vBuffer，0，bufSize）；
无符号字符*uPtr，*vPtr；
uPtr=uBuffer；
vPtr=vBuffer；
对于（int i=0；i

默认情况下，着色器程序中的纹理采样器与纹理单元0关联（默认值为0）。
必须通过将纹理单元的索引指定给纹理采样器。纹理单元是纹理和对象之间的绑定点。e、 g:

GLint locTexY=glGetUniformLocation（程序，“textureY”）； GLint locTexU=glGetUniformLocation（程序，“textureU”）； GLint locTexV=glGetUniformLocation（程序，“textureV”）；

glUseProgram（程序）；
glUniform1i（locTexY，0）；//对应于GL_纹理0
glUniform1i（locTexU，1）；//对应于GL_纹理1
glUniform1i（locTexV，2）；//对应于GL_纹理2

---

自OpenGL 4.20以来，可以通过以下方式在着色器中设置：

layout（binding=0）统一采样器2D纹理；
布局（装订=1）统一的纹理；
布局（装订=2）均匀取样器；

着色器似乎不是问题所在。您必须显示创建纹理图像的代码和设置纹理采样器的代码。@rabbi76我刚刚编辑过，请看一下为什么

width/4

？您将纹理单位的索引分配给纹理采样器制服的何处？@Rabbi76

glActiveTexture（GL_TEXTURE0）、glActiveTexture（GL_TEXTURE1）、glActiveTexture（GL_TEXTURE2）

将分别通过opengl@Rabbid76很抱歉它应该是

width/2

和

height/2

uniform sampler2D textureY;
uniform sampler2D textureU;
uniform sampler2D textureV;
void main() {
    vec3 yuv, rgb;
    vec3 yuv2r = vec3(1.164, 0.0, 1.596);
    vec3 yuv2g = vec3(1.164, -0.391, -0.813);
    vec3 yuv2b = vec3(1.164, 2.018, 0.0);

    yuv.x = texture(textureY, texCoord).r - 0.0625;
    yuv.y = texture(textureU, texCoord).r - 0.5;
    yuv.z = texture(textureV, texCoord).r - 0.5;

    rgb.x = dot(yuv, yuv2r);
    rgb.y = dot(yuv, yuv2g);
    rgb.z = dot(yuv, yuv2b);

    FragColor = vec4(rgb, 1.0);
}

FILE fp = fopen("nv21.raw", "rb");
unsigned char *yuvBuffer = new unsigned char[width*height*3/2];
fread(yuvBuffer, 1, width*height*3/2, fp);

unsigned char *vuBuffer = &yuvBuffer[width*height];

int bufSize = width*height/4;
unsigned char *uBuffer = new unsigned char[bufSize];
memset(uBuffer, 0, bufSize);
unsigned char *vBuffer = new unsigned char[bufSize];
memset(vBuffer, 0, bufSize);

unsigned char *uPtr, *vPtr;
uPtr = uBuffer;
vPtr = vBuffer;

for (int i = 0; i < bufSize; i++)
{
    *vPtr = *vuBuffer++;
    *uPtr = *vuBuffer++;
}

GLuint textureID[3];

glGenTextures(1, &textureID[0]);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, &yuvBuffer[0]);
glBindTexture(0);

glGenTextures(1, &textureID[1]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textureID[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height/2, 0, GL_RED, GL_UNSIGNED_BYTE, uBuffer);
glBindTexture(0);

glGenTextures(1, &textureID[2]);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, textureID[2]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height/2, 0, GL_RED, GL_UNSIGNED_BYTE, vBuffer);
glBindTexture(0);