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  1. OpenGL texture renders solid white

    Aha! If I set my out texCoord in my vertex shader to (its a 1 by 1 square), it renders!(Looks like there's still a couple of visual bugs my image loader, though.) I wonder if it has something to do with my trying to send interlaced model data. Either way I know where to look for now. Thank you guys for the help!
  2. OpenGL texture renders solid white

      If I set outColor to the Color uniform, the rectangle renders in that color ( I used red), so I'd assume that OGL automatically binds the first fragment out attribute to fragment color.     The vetex shader passes texCoord: #version 150 //vertex shader uniform mat4 projection_matrix; uniform mat4 modelview_matrix; in vec3 a_Vertex; in vec2 a_TexCoord; in vec3 a_Normal; out vec2 texCoord; void main(void) { texCoord = a_TexCoord; //right here vec4 pos = modelview_matrix * vec4(a_Vertex, 1.0); gl_Position = projection_matrix *pos;} Both shaders are loaded from a handler class at the beginning of g.Initialize()(#1); This is the loading code: bool Load(string filename = "Data/Shaders/Basic"){ GLuint VertexHandle,FragmentHandle; Program = glCreateProgram(); VertexHandle = glCreateShader(GL_VERTEX_SHADER); FragmentHandle = glCreateShader(GL_FRAGMENT_SHADER); string VertCode,FragCode; string FN = BASEFILE + filename + ".vrt"; ifstream file(FN.c_str(),ifstream::in); if(file.good() != true){MessageBoxA ( NULL, FN.c_str(), "Graphics Error", MB_OK );} while(file.good()){VertCode += file.get();} file.close(); VertCode.erase(VertCode.length()-1,1); FN = BASEFILE + filename + ".frg";,ifstream::in); while(file.good()){FragCode += file.get();} file.close(); FragCode.erase(FragCode.length()-1,1); const GLchar* vrtmp =static_cast<const GLchar*>(VertCode.c_str()); const GLchar* frtmp =static_cast<const GLchar*>(FragCode.c_str()); glShaderSource(VertexHandle,1,&vrtmp,NULL); glShaderSource(FragmentHandle,1,&frtmp,NULL); glCompileShader(VertexHandle); glCompileShader(FragmentHandle); GLint fr_CompileStatus, vr_CompileStatus, LinkStatus; glGetShaderiv(VertexHandle,GL_COMPILE_STATUS,&vr_CompileStatus); glGetShaderiv(FragmentHandle,GL_COMPILE_STATUS,&fr_CompileStatus); if(vr_CompileStatus !=0 && fr_CompileStatus !=0){ glAttachShader(Program,VertexHandle); glAttachShader(Program,FragmentHandle); LinkStatus = 0; glLinkProgram(Program); //Program is a member variable glGetProgramiv(Program,GL_LINK_STATUS,&LinkStatus); if(LinkStatus!= 0){ //Member variables MODELVIEW_MATRIX = glGetUniformLocation(Program,"modelview_matrix"); PROJECTION_MATRIX = glGetUniformLocation(Program,"projection_matrix"); TEXTURE_0 = glGetUniformLocation(Program,"texture0"); COLOR = glGetUniformLocation(Program,"Color"); MATERIAL = glGetUniformLocation(Program,"Material"); glBindAttribLocation(Program,0,"a_Vertex"); glBindAttribLocation(Program,1,"a_Normal"); glBindAttribLocation(Program,2,"a_TexCoord"); return true;} else{ char err[100]; glGetProgramInfoLog(Program,100,NULL,&err[0]); MessageBoxA ( NULL, err, "Shader Linker Error", MB_OK );return false; /*LINKER ERROR*/} } else{ char err[849]; glGetShaderInfoLog(FragmentHandle,849,NULL,&err[0]); MessageBoxA ( NULL, err, "Shader Compiler Error", MB_OK );return false;/*COMPILER ERROR*/} } It should fail gracefully if the shaders dont' compile. Also, glUseProgram() is called every frame, in a pre-paint function.
  3. Hello! I don't usually ask for help, but I'm at wit's end trying to solve this puzzle. The problem is that I am trying to test a hand-written PNG loader by rendering the image data onscreen, but no matter what I try I can't get it to show up more than a solid white quad(white is the image's background color, though. Without a texture the quad shows up black). I've checked around the internet and tried a bunch of solutions but none of them have worked so far. However, just for a sanity check, I'll go through it all one more time:   1. Make sure that your image isn't loaded before openGL is initialized: //WNDPROC case WM_CREATE switch (uMsg){ case WM_CREATE: hdc = GetDC(hwnd); PIXELFORMATDESCRIPTOR pfd; int pixelFormat; memset(&pfd,0,sizeof(PIXELFORMATDESCRIPTOR)); pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 32; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; pixelFormat = ChoosePixelFormat(hdc,&pfd); SetPixelFormat(hdc,pixelFormat,&pfd); hrc = wglCreateContext(hdc); wglMakeCurrent(hdc,hrc); glewInit(); //Opengl Init somewhere right here wglMakeCurrent(hdc,hrc); Window::s_hWnd = hwnd; g.Initialize(); //Image Load Here return 0; 2. Make sure that you have mipmaps disabled/ filtering at linear or nearest:   //Image. Load(), not called with constructor //Load Image... glEnable( GL_TEXTURE_2D ); glActiveTexture(GL_TEXTURE0); glGenTextures(1,&TexID); //create TexBuffer glBindTexture(GL_TEXTURE_2D,TexID); //Finalize and make it current glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8,Width,Height,0,GL_RGBA,GL_UNSIGNED_BYTE,getImageData()); //getImageData() returns &ImageData[0]; glDisable( GL_TEXTURE_2D ); //I heard this solved one person's problem, no change either way. }  3.Make sure your shaders are set up properly #version 130 //fragment shader uniform sampler2D texture0; uniform vec3 Material; //future uniform uniform vec3 Color; //future uniform in vec2 texCoord; //matches with vertex shader out vec4 outColor; void main(void) { outColor = texture(texture0,; } The attribute for tex coords is bound at slot 2, and at runtime the uniform slot for "texture0" is 2 according to the debugger   4. Make sure your draw calls send tex coordinates (Like I said before I tried this with immediate mode and it still didn't work) //rendering loop glEnable( GL_TEXTURE_2D ); glActiveTexture(GL_TEXTURE0); //for loop{ glBindTexture(GL_TEXTURE_2D,Store.Models.Block[i].Data->TexID); glUniform1i(Cam.Lens.TEXTURE_0,0); //matrix transforms.. glBindBuffer(GL_ARRAY_BUFFER,Store.Models.Block[i].VBO); //stored as one big buffer, 3 vertex floats, 3 normal floats,and 2 texcoord floats per vertex glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,8*sizeof(float),0); //Veticies glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,8*sizeof(float),(GLvoid*)(3*sizeof(float))); //Normals glVertexAttribPointer(2,2,GL_FLOAT,GL_FALSE,8*sizeof(float),(GLvoid*)(6*sizeof(float))); //TexCoords glDrawElements(GL_TRIANGLE_STRIP,Store.Models.Block[i].Data->ILength, GL_UNSIGNED_SHORT,&Store.Models.Block[i].Data->Index[0]); } glDisable( GL_TEXTURE_2D ); }//end 5. What are you trying to draw? //Data for the model float VertsNormUV[32] = {1,0,0, 0,0,1 ,0,0, 1,1,0, 0,0,1 ,0,1, 0,1,0, 0,0,1 ,1,1, 0,0,0, 0,0,1 ,1,0,}; short indecies[6] = {1,2,3,1,0,3}; 6 Where are you storing it? The model data, model instances, and images are all stored in a container class owned by a global Graphics class (g), which initializes it's data at the end of the WndProc Create message(in #1).   On top of that, after I load the image data into the texture object, I can get the same data back out with glGetTexImage().So the texture is loading properly, and the vertecies are rendering correctly, but it still isn't textured right. The image is a small 16x16 sprite, which should work because it's a power of two.   Anyways, I'm struggling to figure this one out, so any help would be appreciated!