glsl

I'm really struggling to fix an issue with my SSAO shader and could desperately use some help. Basically the shader seems to work on some objects, but looks really bad on others. From the below you can see the sphere looks correct, but the cube seems to be doing occlusion on normals that it shouldn't. Here is a screenshot: I am basing my shaders off of this tutorial: http://devmaster.net/posts/3095/shader-effects-screen-space-ambient-occlusion In my render chain I render 2 render targets which get used in some post process effects later on. One of them stores the position and depth. The other

Say I have an image of size 320x240 . Now, sampling from an sampler2D with integer image coordinates ux, uy I must normalize for texture coordinates in range [0, size] (size may be width or height). Now, I wonder if I should normalize like this texture(image, vec2(ux/320.0, uy/240.0)) or like this texture(image, vec2(ux/319.0, uy/239.0)) Because ux = 0 ... 319 and uy = 0 ... 239 . The latter one will actually cover the whole range of [0, 1] correct? That means 0 corresponds to the e.g. left-most pixels and 1 corresponds to the right most pixels, right? Also I want to maintain filtering, so I

I am currently building an app for Android, but have run into some problems with a shader that refuses to render. Consider the following fragment shader: uniform vec4 color; void main(){ gl_FragColor = vec4(1.0); } This shader works fine for drawing an object in a solid color (white in this case). The uniform vector color is optimized away, and cannot be found with glGetUniformLocation() (returns -1). Trying to get the color from the uniform variable can be done like so: uniform vec4 color; void main(){ gl_FragColor = color; } However, when I use this, nothing renders. The shader is created

I am now setting up layout quantifier (location) for my GLSL shaders. And this question hits me whether those quantifier ID need differ with each other. Does it have to be: layout (location = 0) uniform vec3 v1; layout (location = 1) in vec3 v2; layout (location = 2) uniform vec3 v3; layout (location = 3) in vec3 v4; Or it can be (as the location can be specified as uniforms or inputs): layout (location = 0) uniform vec3 v1; layout (location = 0) in vec3 v2; layout (location = 1) uniform vec3 v3; layout (location = 1) in vec3 v4; Thanks. While for vertex shader attributes the layout location