opengl-3

I'm currently porting an old OpenGL 1.1 application which makes use of wireframe models to OpenGL 3.0. In 1.1 following code is used to create a dashed line: glPushAttrib(GL_ENABLE_BIT); glLineStipple(1, 0x0F0F); glEnable(GL_LINE_STIPPLE); Here as usual the parameters are pushed to the stack in order to influence all following drawing operations. My question: how is this done in OpenGL3 where this stack is no longer used? How can I set up my lines to be dashed (probably before handing the coordinates over to glBufferData()? For separate line segments, this is not very complicated at all. For

So this one is a doozie; I've got a pretty large OpenGL solution, written in version 3.2 core with GLSL 1.5 in Windows 7. I am using GLEW and GLM as helper libraries. When I create a window, I am using the following lines: // Initialize main window glewExperimental = GL_TRUE; glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3); // Use OpenGL Core v3.2 glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2); glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); if(!glfwOpenWindow(Game::WINDOW_X, Game::WINDOW_Y, 0, 0, 0, 0, 32, 0, GLFW_WINDOW)) { ... If I omit the three glfwOpenWindowHint

I'm facing a problem where SDL says it does not support OpenGL 3.x contexts. I am trying to follow this tutorial: Creating a Cross Platform OpenGL 3.2 Context in SDL (C / SDL) . I am using GLEW in this case, but I couldn't get gl3.h to work with this either. This is the code I ended up with: #include <glew.h> #include <SDL.h> int Testing::init() { if(SDL_Init(SDL_INIT_EVERYTHING) < 0) { DEBUGLINE("Error initializing SDL."); printSDLError(); system("pause"); return 1; // Error } //Request OpenGL 3.2 context. SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); SDL_GL_SetAttribute(SDL_GL

I'm trying to use QGLWidget in Qt 4.8.2. I noticed that the default context QGLWidget creates doesn't show any output for OpenGL above 3.1. The Qt wiki has a tutorial that demonstrates using OpenGL 3.3 to draw a simple triangle. When I try to run the tutorial, I get a blank screen. If I change the OpenGL version to 3.1, I get the expected output (a red triangle). My video card supports OpenGL 4.2, and calling QGLFormat::openGLVersionFlags() before creating the QGLWidget shows that Qt detects OpenGL 4.2 and all previous desktop versions. Here's another minimal example: #include <QApplication>

This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles

I noticed that unless I re-call VertexAttribPointer, there's not input to shaders after a BindBuffer. Is that necessary? The shaders may not change in writing but only the buffers used. tibur already answered to the actual question, but I thought I'd add some context. glBindBuffer(GL_ARRAY_BUFFER, ...) by itself does not do anything. Think of it as an extra argument to glVertexAttribPointer . Remember, you can bind multiple buffers to different attributes (say attrib 0 uses vbo 1, while attrib 1 and 2 use vbo 2). What API order would you see for that setup ? With the actual API, it's something

So I started using OpenGL with glew and GLFW to create a game engine, and I almost immediately ran into a problem when starting working with shaders: They are not being used or have no effect whatsoever if they are being used. I have been checking my code with plenty of other examples, and they all match up, nothing looks out of place, and I am starting to run out of ideas and patience (I have been trying to figure out why for nearly a month now) with this. My main core code is here: #include "headers/Default.hpp" //Window width and height variables int windowWidth = 800; int windowHeight =