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I want to load an image (jpg and png) with OpenCV as OpenGL Texture. Here is how I load the image to OpenGL: glEnable(GL_TEXTURE_2D); textureData = loadTextureData("textures/trashbin.png"); cv::Mat image = cv::imread("textures/trashbin.png"); if(image.empty()){ std::cout << "image empty" << std::endl; }else{ glGenTextures( 1, &textureTrash ); glBindTexture( GL_TEXTURE_2D, textureTrash ); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S , GL_REPEAT ); glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ); glTexImage2D(GL_TEXTURE_2D,0,3,image.cols, image.rows,0,GL_RGB,GL_UNSIGNED_BYTE, image.data); } The image is loaded, as "image.empty" always returns false Here is how I render the scene using the created texture: glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, textureTrash); glm_ModelViewMatrix.top() = glm::translate(glm_ModelViewMatrix.top(),0.0f,-13.0f,-10.0f); glUniformMatrix4fv(uniformLocations["modelview"], 1, false, glm::value_ptr(glm_ModelViewMatrix.top())); std::cout << "textureShaderID: " << glGetUniformLocation(shaderProgram,"texture") << std::endl; glUniform1i(glGetUniformLocation(shaderProgram,"texture"), 0); objLoader->getMeshObj("trashbin")->render(); And finally the fragmentShader where I want to apply the texture to my geometry #version 330 in vec2 tCoord; // texture // // TODO: set up a texture uniform // uniform sampler2D texture; // this defines the fragment output // out vec4 color; void main() { // TODO: get the texel value from your texture at the position of the passed texture coordinate // color = texture2D(texture, tCoord); } The texture coordinates are come

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