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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How do I implement a LWJGL orthogonal matrix?

As seen on the official LWJGL page, I tried. But failed. All the things I've found on SO and other sites didn't answer anything that had to do with this specifically. I've been on this for weeks. It's ...
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1answer
27 views

OpenGL GLSL vector of sampler2D

If im trying to create an obj. file loader in c++ and draw it with opengl i need to use multiple textures in the fragment shader.I know i can just use: `uniform sampler2D Texture1` `uniform ...
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5 views

How to copy texture of type GL_TEXTURE_EXTERNAL_OES to a texture of type GL_TEXTURE_2D

How to copy texture of type GL_TEXTURE_EXTERNAL_OES to a texture of type GL_TEXTURE_2D ? How to find the internal format of texture ?
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1answer
36 views

How do I calculate a vertex's position on the CPU?

I'm creating light processor and I need light position and vertex position after translating, rotating and scaling (to calculate distance between them to check if light is affecting my vertex ...
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0answers
16 views

Best way to find line segment intersection

I am working with an OpenGL ES 2.0 shader and need to find the point of intersection between two line segments in 2D space. I receive them in terms of both coordinates of both lines. Because they are ...
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1answer
48 views

C++ & OpenGL - Bad orthographic projection matrix?

So I'm trying to render 2D text in my Game Engine using programmable pipeline. Normally I'm using perspective projection matrix but for UI elements I'm trying to create orthographic projection matrix ...
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2answers
25 views

Using VBO in Opengl. powered with c# TAOFramwork

I'm doing a 3D display for a big object. I've managed to display it with opengl primitives, so it's (very) slow Now i want to use the VBO optimization. But when i lost the focus on the opengl window ...
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votes
1answer
49 views

Java - LWJGL OBJ Loader with Materials not rendering

So I successfully loading my obj file but I obviously want to get materials on it. I added the vt(texture) to the OBJLoader and the Model.render but still rendering textureless. I have exported the ...
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0answers
17 views

libGDX ShapeRender flicker when translated

I have recently started working with libGDX and have encountered a strange bug. When shapes rendered by a ShapeRenderer they appear to flicker/strobe while being translated. My code looks something ...
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1answer
19 views

Should I add error handling to SDL_GL_SetAttribute?

As the title says, I wonder if I should handle errors for : SDL_GL_SetAttribute Can it actually fail to set? And if it can, what could be a reason for it to fail?
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3answers
77 views

OpenGL Colour Issues

I am using a single VBO to store vertices in the follow format: v1X, v1Y, v1Z, v1R, v1G, v1B, v2A, v2X, ... Vertex positioning is fine, shapes show up where expected, however instead of using the ...
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0answers
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OpenGL Arc-Ball Camera Yaw Pitch GLM::Rotate

I'm currently working on a small Voxel-Editor Project. In the editor, I plan on using an Arc-Ball camera which rotate around the model. My camera is currently working but in an odd way. I can't seem ...
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4answers
2k views

LWJGL vs Slick2D vs OpenGL. What is the difference?

I was wondering what the difference was between LWJGL, Slick2D, and OpenGL. If I'm not mistaken LWJGL is a library and it has the methods and such, but what are the other two for and how do they use ...
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2answers
537 views

translate-scroll repeated 2d texture using opengl shader

I managed to implement an infinite 2d texture scrolling using the following shader. btw I'm using cocos2d-x 2.2.1. The vertex shader: attribute vec4 a_position; attribute vec2 a_texCoord; #ifdef ...
3
votes
1answer
74 views

unable to render to multiple textures

I'm trying to make an example of deferred rendering. I'm trying to render to three separate textures the position, the normal and the color. Here is the setup : void setup() { //generate and bind ...
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1answer
72 views

Modern OpenGL c++ obj loader

So i made a obj loader in c++.I used blender to export my files. I tried to draw 2 squares(one perpendicular to the other) and when im looking at them from above some weird black triangles apear, ...
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1answer
61 views

Obj file loader in c++ from blender [on hold]

So i want to export files from blender which have: triangles,normals,texcoords and materials.and use modern opengl and c++ to create a obj file loader.I also use sfml. I have a shader loader class ...
3
votes
1answer
157 views

deferred tiled lighting

EDIT I have discovered that it does not seem to be the lighting calculation but the culling code because when i draw the lights without the culling it works perfectly. I have been attempting to ...
4
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0answers
48 views

Depth Peeling implementation problem: How to render the next layer? (OpenGL)

I try to implement order-independet transparency sticking to the pseudo code in the linked paper (page 4). I can't figure out how they are able to do this in OpenGL. I am rendering the scene two ...
-3
votes
2answers
133 views

How do you define and draw rectangles in OpenGL?

I am very new to OpenGL and I am not sure one the basis of how to create and draw objects. So how would I draw simple rectangles in a window using OpenGL? My understanding is that I need to define an ...
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1answer
47 views

C++ OpenGL More textured objects equals less FPS

So I'm creating a game engine with many features, last time I focused on textures. When I finished implementing some new code (Made by myself) I created new Entity with texture, and it was working ...
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2answers
130 views

How to wrap textures inside shader GLSL

I'm trying out GLSL and one of the problems I'm facing is wrapping a random texture sampler in the shader. Searching for answers on the web first, this leads me to using these commands: ...
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0answers
65 views

Modern OpenGL and SpriteBatching

I tried to find tutorials regarding SpriteBatch done in Modern OpenGL 3.0+, but failed to find any good resources so far. So can anybody please provide me a good resource/tutorial to achieve ...
2
votes
1answer
72 views

Transparency sorting in 3D world with different render types

I am rendering a world, object, and models from an older game format. The world is presented in a BSP tree so I can quickly iterate through. The opaque surfaces are rendered front to back. Then ...
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0answers
22 views

Disable OpenGL NVidia Driver Optimization During Development

I've noticed while looking at gDebugger that sometimes what I dispatch as draw calls never actually show up in the logger. I assume that there is some driver level optimization going on here; so is ...
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0answers
30 views

Assimp setup in C++ CodeBlocks MingW compilator g++ [closed]

Im trying to learn game development.In the past i used old c++,opengl,and blender to create an obj file loader for my projects.Now i saw that this library Assimp is much better.But i have no idea how ...
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0answers
48 views

Modern OpenGL class in c++ for loading model [duplicate]

I want to create a class in c++ that loads a model with the obj format.The model gets generated from Blender(3D modeling program).When i try do draw something on the screen without the class(all the ...
5
votes
2answers
224 views

How to render water reflections on multiple heights

I'm making a voxel game on OpenGL, and are trying to find a way to render semi-realistic water (At least partially good looking, it doesn't need to be strictly scientific accurate). All sources ...
0
votes
1answer
79 views

Modern OpenGL project in c++ .obj loader

I want to create a class in c++ that loads a model with the obj format.The model gets generated from Blender(3D modeling program).When i try do draw something on the screen without the class(all the ...
9
votes
3answers
3k views

Order independent transparency in particle system

I'm writing a particle system and would like to find a trick to achieve proper alpha blending without sorting particles because: Each particle is a point sprite in a single mesh and I can't use ...
3
votes
1answer
308 views

Pyglet: text.Label().draw to FBO?

I just started OpenGL (PyopenGl) & Pyglet 3 weeks ago, and decided to read the Red Book. So sorry if my question shows my lack of comprehension... My question is: Is it possible to display/write ...
0
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0answers
38 views

A 2D card game using OpenGL

I am creating a 2d card game. I have written the low-level functions, game logic, game algorithms in C++. I now have to create a graphics layer that the player can interact with. This just has to be ...
-1
votes
0answers
22 views

How to rotate Vector3 in OpenTK?

I'm completely new in OpenGL and OpenTK world so I want to ask the noob question. I'm working on a 3D application in visual basic and I want to rotate the camera around the "0,0,0" position without ...
5
votes
2answers
997 views

“Normal” Blend Mode with OpenGL Trouble

I've been having a lot of trouble trying to get a OpenGL blend function to work as I'd expect it to with like what I'd expect (or from any sensible image editing program). As an example, I'll use ...
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votes
1answer
69 views

Using gl3w and Win32 api, without glut [closed]

I'm still a beginner, the example on skaslev's site require us to use glut as an interface to create a window. For some reason, I'm required to create a window purely with Win32 api, but I am not ...
0
votes
1answer
182 views

Invalid coordinates returned by glutMouseFunc()

I am using GLUT's glutMouseFunc() function to retrieve the coordinates of mouse clicks. I want to move the object on that coordinate to another coordinate. But when I click on the object the ...
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0answers
29 views

Issue with Use SSBO OpenGL

Students that use OpenGL. Do not speak English well. So please understand. There is currently a problem C++ Code Setup() : glGenBuffers(1, &ssboHandle); GLuint ssbo_binding_point_index = 0; ...
3
votes
1answer
344 views

Drawing fonts with LWJGL3 with OpenGL

I'm very sorry if this question has already been answered, but since I've been struggling with this for many days I thought I'd give it a shot here. My goal is to somehow render some text on the ...
0
votes
1answer
34 views

Wrong texture position on camera move

When in my game i move my character, the camera follows it. I have no problem drawing this char when it is moving or moving another char when the camera is still. Now, when i move both of them, the ...
1
vote
1answer
149 views

Cannot find bug in frustum culling code

I've written some code for frustum culling, but for some reason, it is not working, and i can't find the bug in it... Maybe a bug in the math, somewhere? So, i'm asking you if anyone could check these ...
2
votes
1answer
144 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. ...
1
vote
0answers
36 views

Cell height with heightmap for collision detection

Hello everyone I'm programming a game with c++ and openGL. My world is generated from a heightmap (100x100 matrix with values 0-255) and now I need a function that returns the actual height based on ...
2
votes
1answer
46 views

Cannot connecting texture to heightmap using mapped uniform location

In my shader program, I have my attributes and uniforms added to a map for each. What I have displayed is a heightmap, but cant seem to connect the graphic texture to display. mUniformList ...
1
vote
1answer
69 views

How to combine depth and stencil tests?

I have a continuous height-mapped mesh to represent landscape. I use the stencil test to create holes in the mesh. I draw holes to the stencil buffer and then use it to discard mesh fragments. ...
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votes
0answers
47 views

Wrong Normal When Models is Close to Each Other

I have a problem regarding my Normal FrameBuffer that creates gaps between models. The image below contains 10x2x10 block (Minecraft style) and one character. The image is outputed through: ...
0
votes
1answer
179 views

Collision between a sphere and a mesh(height-map)

I am trying to implement a method that detects the collision between a sphere and a mesh and reflects the vector of speed. I have a method, that detects a collision between a sphere and a triangle and ...
1
vote
1answer
100 views

Implementing Shadow Mapping in Python and OpenGL 2.1

I am trying to create a little shadow mapping demo. My code is currently divided into three rendering passes: Pass 1 - Create the depth texture that will be used for shadow mapping on an offscreen ...
1
vote
1answer
150 views

Minecraft Modding - How do I use OpenGL stencil functions alongside the game's GlStateManager?

Note: I am using Minecraft Coder Pack 9.10 for game version 1.8.0 (official release). I am trying to make a multiline text field similar to the game's original net.minecraft.client.gui.GuiTextField. ...
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2answers
145 views

Render specific part of a texture in OpenGL (2D Sprite Sheet)

I've looked at this answer to find out how to render just a part of a texture: http://stackoverflow.com/questions/6884285/c-opengl-render-part-of-an-image I tried that, but the problem is, this is how ...
1
vote
1answer
253 views

Trying to implement Camera

I'm trying to implement a Camera class in order to walk and look on the world as follow: #ifndef _CAMERA_H_ #define _CAMERA_H_ #include <glm\glm.hpp> class Camera { public: Camera(); ...