A GPU program used in rendering. It is executed for each sample taken from a rasterized primitive. The output of this process is a number of values and a floating-point depth.
Resources
Questions tagged [fragment-shader]
1506 questions
0
votes
1 answer
Android OpenGL es 2.0 specular light
I'm trying to add specular lightning to my android OpenGL project, but the light is only projected on a part of my object, as you can see in my example:
In my fragment shader, I calculate the color as following:
float dot(vec3 v1, vec3 v2)
{
…
Michiel van Vaardegem
- 2,260
- 20
- 35
0
votes
1 answer
When I don't access one of my textures, the other texture lookup appears black
I have the following CG pixel shader:
float4 main(
float2 texCoord : TEXCOORD0,
float4 position : TEXCOORD2,
float4 color : COLOR,
uniform sampler2D texture_sample : TEX1,
uniform sampler2D stipple_sample : TEX2,
uniform…
0
votes
1 answer
GLSL - Trying to add multiple lights?
I have a simple fragment shader that simulates 2D lighting, like so:
struct Light
{
vec2 pos; // Light position
float spread; // Light spread
float size; // Light bulb size
};
void main(void)
{
Light light0; // Define…
user569322
0
votes
2 answers
will this sinus approximation be faster than a shader CG sinus function?
I have some functions that are not really sines but they are a lot quicker than conventional processing, they are simple parabole functions.
Will this be faster on a graphics processor than the built-in graphics sinus function:
float par (float…
bandybabboon
- 2,210
- 1
- 23
- 33
0
votes
1 answer
Using a uniform in an "if" instruction inside a fragment shader don't work since recent chrome update
I'm using GLSL shaders in my WebGL project, a recent Chrome update made my shaders not linking without error message.
The problem occur when i use a uniform as a condition of a "if" in a fragment shader, like this example :
uniform int…
user2781686
- 1
- 3
0
votes
1 answer
Why is drawing a circle procedurally slower than reading from a texture?
I am making a app where i need to draw a lot of circles in the screen, so i had the idea of replacing the texture of the triangles i am using to draw the texture with a function to draw a circle. However after testing, it turned out to be slower…
Guedez
- 189
- 3
- 14
0
votes
0 answers
Summing colors in fragment shader
If I use:
void main() {
gl_FragColor = texture2D ( sampler, uvVarying ) * colorVarying;
}
with colorVarying being (1, 0, 0, 0) in a simple fragment shader, the texture is turned red as I expected.
But I would like to add more red, instead of…
vertti
- 7,539
- 4
- 51
- 81
0
votes
2 answers
Serious Lag due OpenGL Fragment Shader
Fragment shader causes serious lag when I run it on iPhone 4. I tried to comment part of calculations, however still there are some jitters even though I barely am doing any calculation in the Fragment Shader.
// Fragment Shader Code
uniform…
Nima
- 969
- 3
- 10
- 14
0
votes
1 answer
How to pass YUV data into a fragment shader without GL_LUMINANCE
In Android, in order to pass YUV420sp into a fragment shader I pass the information spliting the data into Y-U-V, and passing each sugin glTexImage2D with GL_LUMINANCE format
But now I need to do Offscren-Rendering for which I require FBOs, the…
PerracoLabs
- 16,449
- 15
- 74
- 127
0
votes
1 answer
OpenGL ES 2 - Drawing GL_POINTS directly vs indirectly
I am creating an iOS app for drawing / sketching and right now encountering a problem when I draw GL_POINTS indirectly to an FBO that then this FBO is stamped onto a final FBO.
Here is the result when I draw the GL_POINTS DIRECTLY to an FBO
And…
Coolant
- 448
- 6
- 13
0
votes
1 answer
What's happens on default fragment shader in CG shader language?
I have code on CG. In this code vertex shader emit 3 parameters: vertex position (float4), texture coordinates (float2) and color (float4).
But fragment program not defined.
How shader use this 2 parameters (uv and color) on fragment shader?
toodef
- 125
- 1
- 11
0
votes
1 answer
Best way to animate textures in OpenGL ES 2.0
I want to animate a some numbers in openGl ES 2.0. To try and make it work to start with I have created a timer and am trying to get the numbers to change dependant on the timer. The timer is set up on a sin() wave so the numbers should increase…
D.Cole
- 27
- 10
0
votes
1 answer
GLSL Shader Ported From HLSL Is Not Working
I have this HLSL Shader for blur:
struct VS_INPUT
{
float4 Position : POSITION0;
float2 TexCoord : TEXCOORD0;
float4 Color : TEXCOORD1;
};
struct VS_OUTPUT
{
float4 Position : POSITION0;
float4…
jmasterx
- 52,639
- 96
- 311
- 557
0
votes
1 answer
OpenGL - GLSL Shaders, Alpha blending
I am using this fragment shader:
#version 150 core
uniform sampler2D texture1;
in vec4 pass_Color;
in vec2 pass_TextureCoord;
out vec4 out_Color;
void main(void) {
out_Color = pass_Color;
// Override out_Color with our texture pixel
…
Amit Assaraf
- 512
- 11
- 34
0
votes
1 answer
OpenGL Texture override material color
I want to render a scene and blend the material color with the texture. i am using programmable pipeline and GLSL, when the function texture() is called, all the portion of the meshes wish dont have texture become transparent. (even if i dont use…
bruchuck
- 13
- 2