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| author | Freya Murphy <freya@freyacat.org> | 2025-12-11 10:49:50 -0500 |
|---|---|---|
| committer | Freya Murphy <freya@freyacat.org> | 2025-12-11 10:51:40 -0500 |
| commit | fa8fa6784559ed0fc8d780e36880273f77e272c4 (patch) | |
| tree | 7456a4e9148d47e409ba837bafdc6238b6c757db /assets/vertex.glsl | |
| parent | add ubos (diff) | |
| download | voxel-fa8fa6784559ed0fc8d780e36880273f77e272c4.tar.gz voxel-fa8fa6784559ed0fc8d780e36880273f77e272c4.tar.bz2 voxel-fa8fa6784559ed0fc8d780e36880273f77e272c4.zip | |
i did a lot
Diffstat (limited to 'assets/vertex.glsl')
| -rwxr-xr-x | assets/vertex.glsl | 79 |
1 files changed, 74 insertions, 5 deletions
diff --git a/assets/vertex.glsl b/assets/vertex.glsl index d14d852..f4c3fde 100755 --- a/assets/vertex.glsl +++ b/assets/vertex.glsl @@ -1,14 +1,83 @@ #version 330 core
-in vec3 position;
-in uint data;
+layout (location = 0) in vec3 quad;
-uniform mat4 proj_view;
+layout (std140) uniform Matrices {
+ mat4 proj;
+ mat4 view;
+};
-flat out uint pass_data;
+// world chunk position
+const int CHUNK_SIZE = 16;
+uniform ivec3 chunk_position;
+
+const int MAX_FACES = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE;
+layout (std140) uniform Face {
+ // normaly a uint but std140 layout
+ // requires 16-byte alignment
+ uvec4 face_data[MAX_FACES / 4];
+};
+
+flat out uvec2 pass_data;
+
+uint get_half(int index)
+{
+ int arr_index = index / 4;
+ int vec_index = index % 4;
+ return face_data[arr_index][vec_index];
+}
+
+uvec2 get_data(int index)
+{
+ uint lower = get_half(index * 2);
+ uint upper = get_half(index * 2 + 1);
+ return uvec2(lower, upper);
+}
+
+vec3 get_quad(uint face, uint width, uint height)
+{
+ vec3 squad = quad;
+ squad.x *= width;
+ squad.y *= height;
+
+ switch(face) {
+ case 0u: // PX
+ return squad.yzx + vec3(1, 0, 0);
+ case 1u: // NX
+ return squad.yxz;
+ case 2u: // PY
+ return squad.xyz + vec3(0, 1, 0);
+ case 3u: // NY
+ return squad.zyx;
+ case 4u: // PZ
+ return squad.zxy + vec3(0, 0, 1);
+ case 5u: // NZ
+ return squad.xzy;
+ }
+ // should not happen
+ return vec3(0);
+}
void main(void)
{
- gl_Position = proj_view * vec4(position, 1.0);
+ // get face data
+ uvec2 data = get_data(gl_InstanceID);
+ uint x = (data.x >> 0) & 31u;
+ uint y = (data.x >> 5) & 31u;
+ uint z = (data.x >> 10) & 31u;
+ uint width = (data.x >> 15) & 31u;
+ uint height = (data.x >> 20) & 31u;
+ uint face = (data.x >> 25) & 7u;
+
+ // get quad verts
+ vec3 quad = get_quad(face, width, height);
+
+ // get position
+ vec3 position = vec3(x, y, z);
+ position += chunk_position * CHUNK_SIZE;
+ position += quad;
+
+ // draw
+ gl_Position = proj * view * vec4(position, 1.0);
pass_data = data;
}
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