glsl

问题 The bounty expires in 4 days . Answers to this question are eligible for a +100 reputation bounty. Rabbid76 wants to reward an existing answer . I have an existing system, which provides 3D meshes. The provided data are an array of vertex coordinates with 3 components (x, y, z) and an index list. The issue is that the index list is a consecutive array of quad primitives. The system has to be make runnable with a core profile OpenGL Context first, and later with OpenGL ES 3.x, too. I know that

问题 I am trying to run a little data compression experiment. I am trying to compress 3D textures into hash tables to avoid storing empty volume information. To this effect I wrote the hashing function and retreiving function (they are in different shaders): struct Voxel { int filled; ivec4 position; vec4 normal; vec4 color; }; layout(std430, binding = 0) buffer voxel_buffer { uint index; Voxel voxels[]; }; // Data storing shader int a_size = 10000000; void insert(vec3 pos, Voxel value) { ivec3

问题 Suppose I have an array variable in a shader, declared in a shader storage block: layout(std430, binding = 2) buffer MyBuffer { float lotsOfFloats[]; }; and a struct: struct myStruct { float f1; vec3 vf1; }struct1; Is there a way to "quickly" initialize an object of this structure in a shader using the values in the array in a buffer storage block ( in the lotsOfFloats array in this example)? Say, in C++ one can copy memory from the array to the object: memcpy(&struct1, &lotsOfFloats[0],

问题 I am developing a game for Android using OpenGL ES 2.0 and have a problem with a fragment shader for drawing stars in the background. I've got the following code: precision mediump float; varying vec2 transformed_position; float rand(vec2 co) { return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453); } void main(void) { float distance = 10.0; float quantization_strength = 4.0; vec3 background_color = vec3(0.09, 0.0, 0.288); vec2 zero = vec2(0.0, 0.0); vec2 distance_vec = vec2

问题 I am developing a game for Android using OpenGL ES 2.0 and have a problem with a fragment shader for drawing stars in the background. I've got the following code: precision mediump float; varying vec2 transformed_position; float rand(vec2 co) { return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453); } void main(void) { float distance = 10.0; float quantization_strength = 4.0; vec3 background_color = vec3(0.09, 0.0, 0.288); vec2 zero = vec2(0.0, 0.0); vec2 distance_vec = vec2

问题 I would like to implement texture filtering (min and magfilter) myself in a GLSL shader (as i want to use image_load_and_store and not a sampler, and also I want to handle undefined pixels in a special way) and I'm looking for an article or so that discusses the filtering process. I can recall on how to implement texturefiltering from a raytracer I once wrote - I think you need to take into consideration the UV gradients at each pixel and depending on the length of those somehow scale your

问题 I would like to implement texture filtering (min and magfilter) myself in a GLSL shader (as i want to use image_load_and_store and not a sampler, and also I want to handle undefined pixels in a special way) and I'm looking for an article or so that discusses the filtering process. I can recall on how to implement texturefiltering from a raytracer I once wrote - I think you need to take into consideration the UV gradients at each pixel and depending on the length of those somehow scale your

问题 So firstly, I am aware of this post: ShaderMaterial fog parameter does not work My question is a bit different... I am trying to apply the fog in my three.js scene to a shader thats using a TEXTURE and I can't figure it out. My best guess as to what is supposed to go into the frag was: resultingColor = mix(texture2D(glowTexture, vUv), fogColor, fogFactor); This works when the texture2D part is just a normal color but as a texture it doesn't render. THREE.glowShader = { vertexShader: [ `

问题 I'm drawing with OpenGL on Qtquick and no matter what size I put on my OpenGlVideoQtQuick on QML, it always occupies the entire space of the window. I want to be able to control its size. I created this minimal example which draws a green screen with OpenGL. I should be able to control the size of QQuickItem and thus control the size of the green screen to occupy, for example, 1/4 of the screen. You can see that I even tried (and commented) the setWidth and setHeight methods on the QQuickItem

问题 I'm looking for a list of all extensions available on any iOS devices (and which are available on which device). I haven't found the right page in the apple docs despite a lot of searching, but I'm sure it's there somewhere. Any pointers? 回答1: This code should print out all extensions: NSString *extensionString = [NSString stringWithUTF8String:(char *)glGetString(GL_EXTENSIONS)]; NSArray *extensions = [extensionString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet