opengl-3

I am trying to load an .obj model into my c++ opengl 3 code but for some reason it gives me this error : 1>Linking... 1>.\bunny.obj : fatal error LNK1107: invalid or corrupt file: cannot read at 0x6592 I tried to search for similar errors, but there were about .dll's or .lib's. Can you please help me out with this issue. I have also tried with different obj models but it always gives me this error. You are trying to load your object model with a C++ linker (probably you have just added it to the project, and now it tries to be compiled). The linker can process .obj files, but it waits them to

I have used the legacy openGL with cocoa for years, but I'm now struggling to make the transition to openGL 3.2. There are several examples in the internet, but they are all too complex (and many don't even compile any more under XCode 5.1). Could someone write an example of the simplest, minimalistic, minimum cocoa code just to draw a read triangle to a NSOpenGLView? (no fancy shaders, no displayCallbacks, the fewer the code lines, the better). nik https://stackoverflow.com/a/22502999/4946861 In xcode 6.3.2 I got the example running afterreplacement of (id)initWithFrame:(NSRect)frame with

I'm on a Mac, using Swift, and using OpenGL 3.2. I'm also using XCode 6.1 Beta so I suppose that's the most likely explanation, because it doesn't seem to me like this makes sense. I can't find any evidence that this shouldn't be supported, but this fragment shader is resulting in the error Invalid call of undeclared identifier 'texture2D' during compilation: #version 150 uniform sampler2D usTexture; in vec2 vTextureCoord; out vec4 FragColor; void main() { vec4 color = texture2D(usTexture, vTextureCoord); FragColor = color; } Cripes. Finally found the answer right after I posted the question.

I'm am learning SDL2, but I am also using the imgui library that is using OpenGL calls. From what I read on various blogs online, I can't easily mix SDL2 renderer and opengl calls; I either use one or the other. Most of the tutorials I've read use the renderer, so I do not quite understand how to use SDL2 without the renderer for drawing primitives, or drawing sprites. Take this for example: http://lazyfoo.net/tutorials/SDL/11_clip_rendering_and_sprite_sheets/index.php He creates the sdl renderer: gRenderer = SDL_CreateRenderer( gWindow, -1, SDL_RENDERER_ACCELERATED ); Which he then uses to

I am trying to look for scenarios where Sync Objects can be used in OpenGL. My understanding is that a sync object once put in GL command stream ( using glFenceSync() ) will be signaled after all the GL commands are executed and realized. If the sync objects are synchronization primitives why can't we MANUALLY signal them ? Where exactly this functionality can help GL programmer ? Is the following scenario a correct one ? Thread 1 : Load model Draw() glFenceSync() Thread 2 : glWaitSync(); ReadPixels Use data for subsequent operation. Does this mean that I can't launch thread 2 unless

I'm trying to put together a very basic OpenGL 3.2 (core profile) application. In the following code, which is supposed to create a VBO containing the vertex positions for a triangle, the call to glVertexAttribPointer fails and raises the OpenGL error GL_INVALID_OPERATION . What does this mean, and how might I go about fixing it? GLuint vbo, attribLocation = glGetAttribLocation(...); glGenBuffers(1, &vbo); glBindBuffer(GL_ARRAY_BUFFER, vbo); GLfloat vertices[] = { 0, 1, 0, 1, 0, 0, -1, 0, 0 }; glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); glEnableVertexAttribArray

I was certain that if you bind a buffer via glBindBuffer() , you can safely assume that it stays bound, until the target is rebound through another call to glBindBuffer() . I was therefore quite surprised when I discovered that calling glBindVertexArray() sets the buffer bound to the GL_ELEMENT_ARRAY target to 0. Here's the minimal C++ sample code: GLuint buff; glGenBuffers(1, &buff); std::cout << "Buffer is " << buff << "\n"; glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buff); GLuint vao; glGenVertexArrays(1, &vao); GLint bound_buff; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &bound_buff); std:

I have this code which is context "#version 330 core" gl_Position = PerspectiveViewMatrix(90.0, AspectRatio, 0.01, 1000.0 ) * TranslationMatrix(0, 0, -4 -0.35*MouseWheel) * RotationMatrix(MouseMovement.y, X_AXIS) * RotationMatrix(-MouseMovement.x, Y_AXIS) * RotationMatrix(float(Strafing*3), Z_AXIS) * TransformationMatrix * in_Vertex; Which part of it is old gl_ModelViewMatrix and which part is gl_ModelViewProjectionMatrix? (What is gl_ProjectionMatrix that was used to create ModelViewProjection?) I'm not too familiar with GLSL 3.3, but I bet that PerspectiveViewMatrix (is it even builin