OpenGL is a graphics standard and API which targets the desktop and workstation markets. It is designed to be easy to accelerate with dedicated computer hardware, and hence most implementations give greatly improved performance over traditional software rendering. Currently, OpenGL is used for ...

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1answer
806 views

Question About Scrolling A Tilemap In C++/SDL/OpenGL

I been working with scrolling this week but I recently encounter a problem that I don't understand why it's happening. In a 2D scroller I want to scroll a tilemap pixel per pixel which gives a smooth ...
2
votes
1answer
131 views

Framebufferobject crashes when I do pop without resetting the framebuffer to the original

glPushAttrib(GL_ALL_ATTRIB_BITS); glBindTexture(GL_TEXTURE_2D, 0); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboId); gl::drawFilled(mesh_); //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); glAssert(); ...
2
votes
1answer
1k views

How should I structure my Android platform board game?

I'm new to developing Android games, but not new to developing mobile games (J2ME). I'm currently developing a board game, for a school project, with 2 things - a board and a spinning wheel (both are ...
2
votes
2answers
2k views

How would I use GLM for Bullet Physics?

Right now im working on my c++ game, and im having alot of trouble using GLM and Bullet Physics to create my world correctly. The main problem is that when i export my physics with Blenderv2.57, and ...
2
votes
1answer
270 views

Why doesn't the y Axis work with SuperBible frame reference or GluLookAt

I'm currently trying to understand how to use the GLFrame Class in the superbible book, and acording to the 4th edition of the book, the camera matrix derived from the Frame of reference class should ...
2
votes
1answer
437 views

ATI driver bug and rendering to a texture 2d array in OpenGL

I am trying to render to a texture2Darray in OpenGL, with a similar setup as descriped in this post. My question is, if anyone has gotten this to work on ATI hardware? Or is there still a bug in the ...
2
votes
1answer
970 views

Post processing texture sizes

I'm trying to write some code to do post processing in OpenGL ES2 on the iPhone. All is fine an dandy, except I am having trouble working out how to scale the texture rendered in the rendering step, ...
2
votes
2answers
1k views

How to tell if a glut window has focus from c#

How can I tell if a glut window has focus? Im using c#/tao, Ill use p/invokes if necessary. Basically I want to ignore input if it doesn't have focus.
2
votes
0answers
27 views

OpenGL Depth Cubemap with Geometry Shader Not Rendering Correctly

I was having some trouble with cubemaps in OpenGL, and was hoping to get some help. I've been following a tutorial about point light shadow mapping using cubemaps, where a geometry shader is used to ...
2
votes
0answers
40 views

equirectangular panorama rendering?

I want to render my scenes as equirectangular panorama frames. I can get the angular fisheye which is what I actually need by applying the rendered frame as a texture to a correctly UV mapped circle. ...
2
votes
1answer
23 views

LibGdx OpenGl prevent black part of Light mask texture from overlapping

I am using this masking texture for a dynamic lighting effect in my game: It looks beautiful until two lights begin to overlap: This is obviously because the textures are overlapping when I draw ...
2
votes
1answer
36 views

OpenGL ES God Ray Precision error

I have encountered the following (i think) precision error. (missing link need 10 rep) My source of inspiration was: (missing link need 10 rep) On the PC everything works fine, but on android it ...
2
votes
1answer
100 views

OpenGL 2.1 rotation , Gimball lock

I'm working on a little app for a school project , which should be manipulating 3D objects. And i'm stuck with the rotation , as i'm facing what i think is called the gimball lock ? here's a video I ...
2
votes
1answer
39 views

Nvidia Nsight 4.6 VS Edition. The Graphics debugger can't find glew32.dll

I'm trying to debug some textures and FBO's with Nvidia Nsight 4.6 VS Edition. But when I select either "Start CUDA debugging" or "Start graphics debugging" I get an error. "The program can't start ...
2
votes
0answers
157 views

Texturing Objects in OpenGL

Using OpenGL tutorials found here, I constructed an .obj file loader as well as a texture file loader using SOIL. I have an issue with drawing a textured object. (Shown here) Assuming I created the ...
2
votes
0answers
43 views

Opengl Skybox Texturing Error

I'm using cubemaps to render a skybox in my game. Thinking this would be a simple task I threw some stuff together using the tutorials I found online, particularly this. Taking all of this together, ...
2
votes
1answer
76 views

Looking for specific “textured quad” openGL tutorial in c++ [closed]

I'm new to openGL and I've been googling around for the old and simple textured quad tutorial in openGL but I haven't been able to find one that suits my needs. OpenGL3.X compatible OpenGL|ES 2.0 ...
2
votes
0answers
102 views

Cannot convert bitmap to texture [closed]

I'm doing a little C# / OpenGL project and I can't manage to load textures properly. So here is my texture class : public class Texture { public String Filepath; private int TextureID; ...
2
votes
1answer
140 views

Proper normal vector transformations in normal mapping

Hello! This question is about transforming normal vectors from normal maps properly. I have tried methods from over five sources, still can't get it to work, and I'm really desperate. Included are ...
2
votes
1answer
126 views

How to handle the birth and death of particle without reading from the buffer

I've implemented a simple particle system where each particle has a position, velocity, age and lifespan stored in different SSBOs. Most of the data including all the position, velocity and age is ...
2
votes
0answers
56 views

OpenGL enabled Java game not detected by Fraps

Recently I found out that I could enable OpenGL hardware acceleration in my java game with the line System.setProperty("sun.java2d.opengl", "True"); Initial tests showed a big boost in performance. ...
2
votes
0answers
87 views

OpenGL Planet Generation - Simple Matrix Issue (Planet “Spins” With Mouse)

I originally asked this question on StackOverflow & was directed here by a commenter. Im currently working on a OpenGL planet rendering. I'm using the Tessellation pipeline. So far things are ...
2
votes
0answers
130 views

How much is atomicAdd slower than an atomic counter?

I am considering replacing an atomic counter in my shader code with a SSBO an atomicAdd operation. What I need to know is the difference in performance of these two. I know the atomic counter executes ...
2
votes
2answers
55 views

How do find the right GLxx object for a given function in LWJGL?

I'm just starting to learn the fundamentals of OpenGL via LWJGL. Every OpenGL function is implemented as a method on a GLxx class. The xx corresponds to the version of the spec when that function was ...
2
votes
0answers
59 views

Tangents face the same direction on opposite sides of mesh

I have noticed that the tangent vectors that I am calculating are not always facing the correct direction. The tangents on the left and right of the mesh both face the same direction. Here is a ...
2
votes
1answer
291 views

What is the correct multiplication order for a 2D matrix?

I'm currently trying to create a camera and entity/model matrix for my 2D game similar to that of Unity3D. I've already tried to find answers to this question on stackoverflow/gamedev but i couldn't ...
2
votes
1answer
82 views

Render on texture with alpha 0 for the background colour

Sorry if the question is stupid but I am very new to opengl. I render on a target a scene with a couple of object on a background that is nothing more than the clear colour (which is ...
2
votes
0answers
78 views

SDL_AddTimer + SDL_GL_MakeCurrent not working on Windows [closed]

I'm messing around with C++, OpenGL and SDL doing a game that should be able to run in Windows and Mac OS X. I have a problem that only happens on Windows. Let me describe the scenario. First I ...
2
votes
1answer
315 views

How I reuse the same vertex data, but have different colors, for my sphere objects?

I'm using OpenGL to display a 3D network, with nodes represented as spheres (I haven't gotten to edges yet). I'm a total novice, and having a bit of trouble wrapping my head around OpenGL. These ...
2
votes
1answer
137 views

OpenGL: missing GL_SPECULAR light on the texture

I'am missing specular lighting on the texture. I have #include <GL/glext.h> in the project, so basically I used glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL_EXT, GL_SEPARATE_SPECULAR_COLOR_EXT); ...
2
votes
0answers
471 views

C++ FPS game collision detection with partitioning system or physics engine? [closed]

I'm working on a small FPS game (as a hobby and for learning purposes, nothing else) built with C++ in OpenGL (from scratch). Documenting online on the kind of strategy someone would approach with ...
2
votes
0answers
429 views

OpenGL drawing 500k triangles [closed]

I want to render big, izometric 2d map (using ortho projection). I am using OpenTK and aiming for OpenGL 3.3. Perfect option would be to draw 512x512 map of tiles, which is 262144 blocks -> 524288 ...
2
votes
0answers
1k views

Normal mapping does not work correctly using GLSL and OpenGL [closed]

Hello I wrote a simple OpenGl program using GLSL to render a simple uv mapped plane using the normal mapping technics. Here's the display with a simple phong shading (without normal mapping) : Now ...
2
votes
1answer
274 views

How to work with smaller intermediate textures in OpenGL and GLSL?

I'm working on a project rendering water simulated through smoothed-particle hydrodynamics (SPH) with a non-photorealistic look to use in games. In the actual stage of the project everything about ...
2
votes
2answers
320 views

What is the correct way to draw layered Sprites in modern OpenGL?

So what do I mean by layered sprites? Layered Sprites are Sprites that consist of multiple layers, e.g. you have sprite sheets for the basic Body, the Head, Clothes, Weapons, etc. Well now I wanted ...
2
votes
0answers
486 views

Help with 2D sprite instancing [closed]

Alright, so I'm pretty new to OpenGL programming. I've been writing my own engine, initially using the fixed function pipeline. I then did a 1:1 replacement of the fixed-function methods with shaders ...
2
votes
1answer
714 views

glDrawArrays (layered rendering using geometry shader) only draws one point

I have been debugging this for a while but I can't seem to find the issue. I created a framebuffer for layered rendering like this GLuint buffer; glGenFramebuffers(1,&buffer); ...
2
votes
0answers
1k views

Arcball 3D camera

I have checked multiple threads before posting, but i havent been able to figure this one out. Ok so i have been following this tutorial, but im not using glm, ive been implementing everything up ...
2
votes
0answers
283 views

VBO = glGenBuffers() IllegalStateException [closed]

i'm kinda noob in OpenGL but I have this problem: I get an IllegalStateException at this code: int vboVertex = glGenBuffers(); In-detail exception: Exception in thread "main" ...
2
votes
0answers
114 views

How do I calculate the points of a brush from a Source engine VMF? [closed]

I'm trying to render the brushes from a Source engine .vmf file in C++, using OpenGL. The .vmf stores solid brushes as a series of planes which I would like to use to calculate the points for each ...
2
votes
1answer
1k views

Problem using glm::lookat

I am trying to rotate a sprite so it is always facing a 3D camera. Object GLfloat vertexData[] = { // X Y Z U V 0.0f, 0.8f, 0.0f, 0.5f, 1.0f, -0.8f,-0.8f, 0.0f, ...
2
votes
0answers
374 views

OpenGL: Attempt to allocate a texture too big for the current hardware [closed]

I'm getting the following error: java.io.IOException: Attempt to allocate a texture to big for the current hardware at ...
2
votes
1answer
198 views

OpenGL Calculate Matrices

Im trying to switch from the glTranslate etc to my own Matrices, but for some reason it does not work. Here are my 2 functions to create the view- and projection matrix: public Matrix4f ...
2
votes
0answers
78 views

uniform z slices in clip-space [closed]

1) Context I'm using a regular OpenGL perspective projection matrix created with GLM (glm::perspective) and taking the inverse (glm::inverse) to transform clip-space back into view space (and world ...
2
votes
0answers
888 views

Converting Mouse Coords to 3d coords with Camera position [closed]

So I've looked at all the answers I can possibly find, and nothing seems to fit what I need exactly (because im bad at math). I'll explain what I have thus far: A camera with x,y,z, Pitch and Yaw ...
2
votes
0answers
342 views

Displacement Mapping opengl-es [closed]

I need to do an application similar to this Morfo. And I posted a question here where the answer states the solution is "Displacement Mapping" . And I googled this to do it in opengles. I couldnt get ...
2
votes
0answers
413 views

glFramebufferTexture2D gives corruption with cube map textures

I am using glFramebufferTexture2D with cube map textures but it gives corruption in texture. draw_cube() function works perfectly when i draw that on default framebuffer. GLenum ...
2
votes
0answers
78 views

Everything turning black when pitching down [closed]

Just a quick questions about something that's occurring in my world. Every time I pitch my camera downward, everything starts turning black, and if I pitch upward, everything sort of intensifies. ...
2
votes
0answers
458 views

Per fragment lighting with OpenGL 4.x tessellated model

I'm experienced with OpenGL 3+. I'm dabbling with tessellation shaders and have now got to a point where I have a nicely tessellated teapot/plane demo (quick look here) As can be seen from the ...
2
votes
2answers
737 views

Is this a reliable method of parsing glGetShaderInfoLog()?

I want to get a list of errors and their line numbers so I can display the error information differently from how it's formatted in the error string and also to show the line in the output. It looks ...