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vertex: rotate around x axis

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This commit is contained in:
Zack Buhman 2025-09-29 19:12:39 -05:00
parent 6c57490bdb
commit 9e9fb83bb1
1 changed files with 47 additions and 1 deletions
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48
src/vertex.glsl
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@ -7,9 +7,55 @@ attribute vec4 position;
varying float fade_factor;
varying vec2 texcoord;
mat4 view_frustum(float angle_of_view,
float aspect_ratio,
float z_near,
float z_far)
{
return mat4(vec4(1.0/tan(angle_of_view), 0.0, 0.0, 0.0),
vec4(0.0, aspect_ratio/tan(angle_of_view), 0.0, 0.0),
vec4(0.0, 0.0, (z_far+z_near)/(z_far-z_near), 1.0),
vec4(0.0, 0.0, -2.0*z_far*z_near/(z_far-z_near), 0.0)
);
}
mat4 scale(float x, float y, float z)
{
return mat4(
vec4(x, 0.0, 0.0, 0.0),
vec4(0.0, y, 0.0, 0.0),
vec4(0.0, 0.0, z, 0.0),
vec4(0.0, 0.0, 0.0, 1.0)
);
}
mat4 translate(float x, float y, float z)
{
return mat4(vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(x, y, z, 1.0)
);
}
mat4 rotate_x(float theta)
{
return mat4(vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, cos(time), sin(time), 0.0),
vec4(0.0, -sin(time), cos(time), 0.0),
vec4(0.0, 0.0, 0.0, 1.0)
);
}
void main()
{
gl_Position = position;
gl_Position = view_frustum(radians(45.0), 4.0/3.0, 0.5, 5.0)
* translate(cos(time), 0.0, 3.0+sin(time))
* rotate_x(time)
* scale(4.0/3.0, 1.0, 1.0)
* position;
vec2 tex = position.xy * vec2(0.5) + vec2(0.5);