erik/acdream
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

perf(terrain): single shared VAO/VBO/EBO for all landblocks

Browse source 
Replace 25 per-landblock VAOs with one shared buffer set. Vertex positions
are now baked in world space during AddLandblock (worldOrigin added to each
vertex), so uModel is eliminated from terrain.vert entirely. Buffer rebuild
happens on the cold path (landblock load/unload) via RebuildGpuBuffers.

Draw loop: bind VAO once, then one glDrawElements per visible landblock
into its sub-range of the shared EBO — same frustum-cull logic, no
VAO/VBO rebind overhead per landblock.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-13 21:30:43 +02:00
parent 787e0f0aff
commit d35e4b6de7
2 changed files with 171 additions and 100 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/AcDream.App/Rendering/Shaders/terrain.vert
View file

@ -6,7 +6,6 @@ layout(location = 3) in uvec4 aPacked1; // bytes: ovl1Tex, ovl1Alpha, ovl2Tex,
layout(location = 4) in uvec4 aPacked2; // bytes: road0Tex, road0Alpha, road1Tex, road1Alpha
layout(location = 5) in uvec4 aPacked3; // bits: rot fields + splitDir (see below)
uniform mat4 uModel;
uniform mat4 uView;
uniform mat4 uProjection;
@ -89,7 +88,8 @@ void main() {
else baseUV = vec2(0.0, 0.0);
vBaseUV = baseUV;
vWorldNormal = normalize(mat3(uModel) * aNormal);
// Vertices are baked in world space; normals need no model transform.
vWorldNormal = normalize(aNormal);
float baseTex = float(aPacked0.x);
if (baseTex >= 254.0) baseTex = -1.0;
@ -101,5 +101,5 @@ void main() {
vRoad0 = unpackOverlayLayer(aPacked2.x, aPacked2.y, rotRd0, baseUV);
vRoad1 = unpackOverlayLayer(aPacked2.z, aPacked2.w, rotRd1, baseUV);
gl_Position = uProjection * uView * uModel * vec4(aPos, 1.0);
gl_Position = uProjection * uView * vec4(aPos, 1.0);
}