write a glsl shader
Certainly! Here's a simple GLSL shader that creates a smooth color gradient across a 2D plane:

```c++
// Vertex Shader

attribute vec2 position;

void main() {
    gl_Position = vec4(position, 0.0, 1.0);
}

// Fragment Shader

precision mediump float;

uniform float time;
uniform vec2 resolution;

void main() {
    vec2 uv = gl_FragCoord.xy / resolution.xy;
    vec3 color = vec3(0.5 * sin(time), 0.5 * cos(time), 0.5);
    gl_FragColor = vec4(color, 1.0);
}
```

This shader uses the position attribute to pass in the coordinates of each vertex in the 2D plane, and uses those coordinates to set the gl_Position variable, which determines where each vertex is positioned on the screen.

The fragment shader then calculates the color of each pixel on the screen based on its position (gl_FragCoord) and the current time (time). The resolution uniform is used to convert the pixel coordinates into normalized UV coordinates (ranging from 0.0 to 1.0).

The color is calculated using a combination of the sin() and cos() functions, which oscillate between -1.0 and 1.0 based on the current time. These values are then scaled and combined to create a smooth gradient across the screen. Finally, the gl_FragColor variable is set to the calculated color, with an alpha value of 1.0 (fully opaque).
thank you! i'll test it now :D
Sounds good, Let me know if you need anything further!