GLSL Fragment Shader Bad Values

0
votes

When I try to pass a uniform uint to a fragment shader from a vertex shader, it changes the value. I have confirmed that the value is 1 in the vertex shader by changing the position if the value is not 1. If the value is 1 in the fragment shader, it shows the diffuse texture instead of the diffuse colour. The code is as follows. Also, I have tries passing it as a value within a uniform vec2, but this did not work either.

Vertex Shader:

#version 410
// Layouts
layout(location = 0) in vec3 position;
layout(location = 1) in vec2 texCoord;
// Uniforms (matrices)
uniform mat4 model, view, proj;
// Uniforms (texture)
uniform uint useDiffuseTexture;
// Uniforms (shininess)
uniform float shininess;
uniform float shininessStrength;
// Uniforms (colour)
uniform vec3 diffuseColour;
uniform vec3 specularColour;
// Outputs (texture)
out uint UseDiffuseTexture;
out vec2 TexCoord;
// Outputs (colour)
out vec3 DiffuseColour;
out vec3 SpecularColour;
// Outputs (shininess)
out float Shininess;
out float ShininessStrength;
void main() {
    UseDiffuseTexture = useDiffuseTexture;
    TexCoord = texCoord;
    if(useDiffuseTexture == 1)
        gl_Position = proj * view * model * vec4(position, 1.0);
    else
        gl_Position = vec4(position, 1.0);
}

Fragment Shader:

#version 410
// Inputs (texture)
in vec2 TexCoord;
uniform sampler2D diffuseTexture;
// Uniforms (texture)
uniform uint UseDiffuseTexture;
// Uniforms (colour)
uniform vec3 DiffuseColour;
uniform vec3 SpecularColour;
// Uniforms (shininess)
uniform float Shininess;
uniform float ShininessStrength;
// Output
out vec4 fragColour;
void main() {
    vec4 texColour = vec4(DiffuseColour, 1.0);;
    if(UseDiffuseTexture == 1)
        texColour = texture(diffuseTexture, TexCoord);

    if(texColour.a < 0.2)
        discard;

    fragColour = texColour;
}
2
openglglslfragment-shader

2 Answers

0
votes

In the fragment shader you declare uniform uint UseDiffuseTexture. If you want it to be a value coming from the vertex shader it must be in uint UseDiffuseTexture

Edit
Because the input is a unsigned int it must be qualifyied with "flat": flat in uint UseDiffuseTexture

0
votes

Dude , wrong definitions :D . Change

uniform uint UseDiffuseTexture;
uniform vec3 DiffuseColour;
uniform vec3 SpecularColour;

in your fragment shader with

in uint UseDiffuseTexture;
in vec3 DiffuseColour;
in vec3 SpecularColour;

simply just because you are passing it through the vertex shader and your fragment shader expects 4 INs since your vertex shader has 4 OUTs...