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Questions tagged [frame-buffer]

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Function glBindBuffer access violation while executing

So I have a problem, I am calling some opengl frame buffer functions in my code but for some reason I get the error from the title. I am also calling many other opengl functions without any problems ...
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51 views

How can mobile games consume so little ram?

I got into mobile game development around a year ago, so I would consider myself still very much a beginner. Recently I started optimizing my game, so basically making the code cleaner and downscaling ...
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26 views

Not clearing FBO's Texture error in battery economy mode

When rendering inside a FBO's texture, I'm not using glClear() but overwriting each fragment, GL_BLEND is set to true. This works just fine, but I just realised when my laptop switch to economy mode, ...
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1 answer
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Get black bars with framebuffer and glViewport

I have read several tutorials and answers regarding framebuffers and glViewport, but I can't seem to resolve this issue I have. I want to take a low resolution framebuffer (400x225) and place it in a ...
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1 answer
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Why does reading my depth texture in GLSL return less than one?

I've created a depth texture in OpenGL (using C#) as follows: ...
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0 answers
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Java game loops with high tick times?

Take for example the first game loop from this question. A similar code is used in Minecraft (at least in older versions). I understand the concept and how this loop works in principle. But there is ...
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1 answer
180 views

Texture Glitches When Drawn to Quad

Recently been trying to implement volumetric lighting. The alphaness texture comes out perfectly on Renderdoc, however a strange glitch occurs whenever I either try to directly render the texture ...
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1 vote
0 answers
28 views

Problem generating multiple shadow maps in a loop

I've successfully implemented shadow mapping for a specific direction as you can see in the image below: Now I want to do omnidirectional shadow mapping but without using a cube map. My first step ...
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0 answers
73 views

offset texture attached to frameBuffer to render panorama

I would like to pre-render horizon of large landscape to texture and than paste it as cylindrical screen around the camera (to accelerate rendering of distant details) Easiest would be make 8-gon ...
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1 answer
179 views

Render to cubemap wrong Y values

I'm currently trying to render to a cubemap in order to blur it. However the top and bottom faces appear much closer than they should be in the blurred version. I thought the problem came from my ...
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1 vote
1 answer
4k views

How to get access to framebuffer as a uint32_t * in SDL2?

I am making my first foray into SDL. To do this, I would like to have direct access to the framebuffer on the window as a uint32_t *. This is because I have to pass ...
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2 votes
2 answers
1k views

How do multiple render targets get rendered onto the back buffer(s) then screen?

I'm using DX11. I understand how render targets are created, set, and why they are used, but I am really unsure how this all plays together with presenting it to the screen. Does the GPU ...
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2 votes
2 answers
218 views

How can I position framebuffer objects on the screen in OpenGL?

I currently have two framebuffers which are drawn using glBlitFramebuffer(0, 0, 1920, 1080, 0, 0, 1920, 1080, GL_COLOR_BUFFER_BIT, GL_NEAREST); But the ...
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  • 233
1 vote
1 answer
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Render 2D texture on the cube texture at given location

I would like to simulate a moving sun on the sky. What I have managed to do so far is calculating the exact location of the sun, that is the 3D direction vector from the camera's position in the world ...
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3 answers
2k views

OpenGL ES 2.0 Shadow Mapping - depth only FBO not working due to GL_FRAMEBUFFER_INCOMPLETE_ATTACHMEN

I am trying to add simple shadow mapping to my friends gles 2.0 app. It is based on gles 2.0 and PowerVR SDK. The problem I encounter is that FBO is not valid due to ...
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1 vote
0 answers
415 views

LibGDX Shader does not work with FBO texture

I have a shader and I want to run the shader on the whole rendered image at the end instead of each individual sprite that I render on screen. For this purpose I created an FBO, I render the all my ...
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2 answers
904 views

LibGDX FrameBuffer no Transparency when drawing

I try to draw severeal Sprites to a FrameBuffer. The Sprites are PNGs with transparency. ...
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2 answers
457 views

Can I create custom framebuffer and render to it in cocos2dx?

I want to do post processing effects so I was thinking If I could just make custom framebuffer in cocos2dx like OpenGL and render the ALL SCENES objects in it. I want a single frame buffer for all ...
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1 vote
1 answer
2k views

Game Loop delay the right way and game speed

I am a newbie game developer. I am trying to find a right way to create my game loop. Consider following example. Simple Android Game I have a game with a simple gameplay - bouncing ball. I want ...
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1 vote
1 answer
3k views

Get a camera's frame-buffer in Unity [duplicate]

Is there a way to "record" the display of a camera instead of rendering it on screen? For example, if I want to stream a camera's frame block to an external application.
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1 answer
433 views

OpenGL Regarding Frame/Buffer Caching

I have been trying to get myself refreshed on OpenGL ES. Whilst doing so, I had the following question in mind: Does OpenGL have any "caching" mechanism? For example: Let's say we draw a stationary ...
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1 answer
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glClearBuffer takes 1 second on a Geforce 9500GT

These 2 lines (in C# using OpenTK) seem to cause 1 second lag every frame on a machine with a Geforce 9500 GT ...
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  • 143
5 votes
1 answer
259 views

Best way to initialize values on 32-bit FP framebuffer in OpenGL

I have a framebuffer bound to 32-bit FP texture: ...
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  • 73
1 vote
1 answer
508 views

OpenglGL Render two scenes with one draw call

I need to draw a normal-vector scene and default scene. I could achieve this my having two programs with different fragment shader to produce the following images. It will require me to draw twice. <...
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2 votes
1 answer
868 views

Opentk hdr rendering with framebuffer white screen problem

I am trying to do hdr rendering with two shader programs: one simply draws a hdr texture on a fullscreen quad and the other one does tonemapping. I am trying either linear tonemapping ...
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  • 705
-1 votes
1 answer
317 views

FRAMEBUFFER_UNSUPORTED (0x8cdd)

I've tried to implement bloom following this tutorial. But everytime I get the framebuffer object error 0x8cdd, which I believe means FRAMEBUFFER_UNSUPORTED. I'm pretty sure the problem occures ...
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  • 103
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1 answer
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Achievements system like in Starcraft2

I am playing Starcraft2 and I am fascinated of how it is engineered. So lets say you played a 1v1 ranked game and you pumped 10 marines in the first 320 seconds. You'll get an achievement for that. I ...
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  • 199
1 vote
1 answer
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OpenGL/SDL2 How to resize the render area with the window?

After calling SDL_SetWindowSize, the area being rendered to doesn't change with the window, so if the window gets bigger, it leaves a black area on the top and ...
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  • 169
2 votes
1 answer
153 views

How to determine what color will be written into single pixel framebuffer?

I thinking about rendering into single pixel (1x1) framebuffer. For example we have two triangles which covers whole NDC area, one is green second red. What color will be written to 1x1 framebuffer? ...
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2 votes
1 answer
1k views

Render scene depth to texture via FBO?

I'm trying to render my scene's depth via FBO and Render To Texture. I have a scene that I'm rendering to a texture, then render that texture to a fullscreen quad in a second pass using a fragment ...
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  • 332
2 votes
1 answer
1k views

Stencil Buffer not working as expected in OpenGL ES 2.0 (Android)

I'm trying to get to grips with the stencil buffer. Apart from setting up viewport, camera, etc, my OpenGL ES 2.0 initialisation code is: ...
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0 votes
1 answer
346 views

How to use default framebuffer's depth/stencil when rendering to a texture?

Is it possible to use the default framebuffer depth buffer when rendering to a texture (instead of using a depth texture)? The Idea is to continue to render part of the scene normally but on a ...
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1 vote
1 answer
386 views

GLES multiple output buffers

I'd like to write multiple values (not just the color and depth value) in one pass to avoid redundancy in vertex shader. Therefore, i attach multiple (let's say two) color buffers (e.g. textures) to a ...
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  • 111
5 votes
1 answer
1k views

How to attach a framebuffer to a whole cube map from a GL_TEXTURE_CUBE_MAP_ARRAY?

I'm trying to make shadow cube maps in an array. I want to draw each shadow map with a single pass using a geometry shader, which I read about here: https://stackoverflow.com/questions/462721/...
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  • 169
1 vote
1 answer
1k views

How do I store an FBO'S as a cube map?

As of late I've been trying to implement Cubemaps in my engine, and have managed to get the rendering side of them working. Currently, I'm trying to implement a function for creating them, but I ...
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0 votes
1 answer
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How to make a triangle pixellated with GLFW?

How can one make a triangle look pixelated without modifying the size of the window in GLFW3? Preferably, I'd like to accomplish this without the use of shaders. For example, by setting the size of ...
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2 votes
0 answers
513 views

OpenGL (lwjgl) Frame Buffer Object GL_COLOR_ATTACHMENT Not Being Written To

I am currently developing a deferred renderer for my game engine and I have to output multiple textures from my shader to my GBuffer. I have been struggling with getting multiple outputs from the ...
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2 answers
779 views

"Render" unsigned integer values to texture without clamping to [0,1]

I am trying to render to an unsigned integer texture, with a blending function enable, so that in the end, the value in each texel will be the number of objects rendered on the texel. So I assume I ...
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  • 239
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1 answer
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How to Render and Blend Multiple Frames to a Buffer in Unity?

I was wondering if anyone knew how to render multiple frames from a camera or texture to a buffer in Unity and to then blend them together? Is this possible? If so how would I go about doing so in ...
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0 votes
1 answer
307 views

wrongly scaled on cocos2dx 3.2 when render to multiple fbo (more > 1 deep)?

i have bug that only happen when retina flag disabled. i try draw multiple render texture to achive some multi post effect: so i have 3 render texture, fbo 1 for final pos effect fbo 2 for back ...
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  • 15
3 votes
1 answer
4k views

OpenGL Framebuffer Object issue

I am struggling with implementing a proper Framebuffer Object . glCheckFramebufferStatus is returning me: GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT (36054). What am i missing? ...
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2 votes
0 answers
365 views

OpenGL: Avoid geometry shader for cubemap framebuffer

I want to render an environment map into a cubemap framebuffer but I dislike the fact, that I have to use the geometry shader to set gl_Layer because the geometry ...
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  • 133
0 votes
1 answer
1k views

In Unity, how can I check if an input was made x seconds/frames ago?

I'm using the Rewired input plugin, and it comes with an input buffer. I enabled the buffer for my directional keys and airdash button so that the player doesn't have to hit both keys on the same ...
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  • 331
2 votes
2 answers
13k views

Resizing a Framebuffer Object (ie: its attachments) on Screen Resize

I have been experimenting with some post-processing effects and I have been using FBOs to store stuff. The problem is, I attempt to resize them when I change resolution. I get no errors, however the ...
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  • 198
1 vote
1 answer
165 views

What's wrong with my method of getting intermediate rendering to my postprocessing shader?

I'm working on a project in OpenGL. Earlier this week, I successfully implemented Deferred Shading, but I'm not sure how to pass the information from the Deferred Shader to the Post Processing Shader. ...
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2 votes
2 answers
1k views

Render-to-texture doesn't work on nvidia cards. OpenGL 3.3

I've implemented some postprocessing effects (DOF, HDR, Bloom) into my engine. I've tested it on AMD card which supports OpenGL 4.2. Yesterday I've made a test on NVidia card which supports only ...
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  • 690
2 votes
1 answer
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Shadow map: depth texture always returns 0

I'm implementing a shadow map for the sun light in my voxel engine using a depth texture attached to a framebuffer. But when I sample the depth texture during the normal pass, the value returned is ...
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  • 448
0 votes
3 answers
2k views

Direct access to frame buffer pixels data

I'm trying to develop a 3d graphics engine, i use a framebuffer class which is of my own creation but the fps is too low, and i think it's because i use putpixel() function from winbgim library, my ...
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1 vote
1 answer
2k views

OpenGL 3.3: render to framebuffer w/o depth attachment

I want to render my scene to a framebuffer and store the RGBA values in a texture. For this, I attach a texture to GL_COLOR_ATTACHMENT0. When I define a GL_DEPTH_ATTACHMENT texture as well, everything ...
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  • 127
0 votes
1 answer
850 views

(LWJGL) Pixel Unpack Buffer Object is Disabled? (glTextImage2D)

I am trying to create a render target for my game so that I can re-render at a different screen size. But I am receiving the following error: ...
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