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Questions tagged [geometry-shader]

Geometry shader should not be mixed up with [vertex-shader], but are shader programs executed after vertex shaders. They take as input a whole primitive like point, line or triangle.

Geometry shaders are the 3rd type of GPU shader programs after and and process whole primitives like points, lines or triangles.

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Geometry Shader support in Mesa i965 DRI for Intel SandyBridge Hardware

I am trying to run the GS demo code of Mesa from here : http://cgit.freedesktop.org/mesa/demos/tree/src/gs, by git cloning this: http://cgit.freedesktop.org/mesa/demos However, I get the error as "needs GL_ARB_geometry_shader4 extension". I am not…
Yusuf Husainy
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Directional per-face lighting using Geometry Shader?

Because of limitations I have to calculate vertex normals inside my geometry shader. Because of this limitation the normals are per-face instead of interpolated between faces on the vertex, meaning per-pixel directional lighting is just a waste.…
ManIkWeet
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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 shader would be a basic passthrough shader. Additionally a geometry shader could stall…
tly
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C++, OpenGL - geometry shader

I'm stuck with geometry shaders in OpenGL - c++ programming. I want to create simple cube by repeating 6 times drawing one rotated wall. Here is my vertex shader (everyting has #version 330 core in preamble): uniform mat4 MVP; uniform mat4…
Cheshire Cat
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GLSL How to provide line input for geometry shader?

When using layout(points) in in geometry shader, I can simply forward the data through the vertex shader by suppling gl_Position with a vec4: // Vertex Shader in vec2 position; void main() { gl_Position = vec4(position, 0.0, 1.0); } // cpp…
Scraph
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How do you find the Y position of a point between four vertices? HLSL

Let's say there is a grid terrain for a game composed of tiles made of two triangles - made from four vertices. How would we find the Y (up) position of a point between the four vertices? I have tried this: float diffZ1 = lerp(heights[0],…
Obi-Dan
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Conditional output from geometry-shader GLSL

I am trying to figure out how to switch outputs in the geometry shader, specifically these two outputs: layout(points, max_vertices = 1) out; // OUTPUT 1 layout(triangle_strip, max_vertices = 4) out; // OUTPUT 2 I am doing a rendering of…
mike
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opengl draw in 2D coordinates instead of vertex coordinate system

how can i draw in 2D coordinates instead of vertex coordinate system, as this => drawPoint(50 , 100 , 0.01f); this is my code , a background texture and a point static void Draw(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); …
NPLS
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opengl texture coordinates for full-screen effect

how can i create the full-screen effect with a texture image ? till now i do this : static void Draw(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef(0.0f,0.0f,-5.0f); texture[0] =…
NPLS
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OpenGL Geometry Shader Compilation Error OSX-Mavericks

I started with a working OpenGL program (with vertex and fragment shaders) that draws a single GL_POINT. Then I attached a simple geometry shader that outputs two points given a single point as input: #version 400 layout(points) in; layout(points,…
Dustin Biser
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Geometry Shader Quad Post Processing

Using directx 11, I'm working on a graphics effect system that uses a geometry shader to build quads in world space. These quads then use a fragment shader in which the main texture is the rendered scene texture. Effectively producing post process…
Jester
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Is specifying EndStreamPrimitive() necessary in Geometry shader with streams

EndStreamPrimitive() can only be used in case of Geometry shader with streams. Geometry shader with streams can only emit GL_POINTS. But In GL_POINTS, each vertex itself is a primitive. So what is the point of having a function like…
viktorzeid
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Vertex Shader -> Geometry Shader, error "Getting the location of inactive Uniform"

I have something like the following setup, Vertex Shader (... for irrelevant stuff): #version 330 core uniform mat4 ModelViewMatrix; ... in vec4 position; ... out vec4 out_position; ... void main() { ... out_position = ModelViewMatrix…
Vitali
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geometry shader falsely interpreted as vertex shader

I'm trying to get my simple geometry shader to work. But I have some weird error messages. It seems like opengl thinks that my geometry shader is my vertex shader. This is the error message: 0<10> : error C7575: OpenGL does not allow input…
Jonas
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Debug Geometry Shader in draw call DrawInstancedIndirect

My program is a rain particle system based on the compute shader for advancing rain drops and another rendering shader(vertex shader, geometry shader, pixel shader) for rendering the advanced rain drops. I use the draw call: DrawInstancedIndirect to…
khanhhh89
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