shmup/lofivor
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity Actions

Swap static buffer for heap-allocated

Browse source
This commit is contained in:
Jared Miller 2025-12-15 22:02:48 -05:00
parent 3a54b0dde3
commit 1c0f552032
1 changed files with 10 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
src/sandbox_main.zig
View file

@ -191,10 +191,14 @@ pub fn main() !void {
var instance_material: ?rl.Material = null;
var ortho_camera: rl.Camera3D = undefined;
// static buffer for transforms - allocated once, reused each frame
var transforms: [sandbox.MAX_ENTITIES]rl.Matrix = undefined;
// heap-allocated transforms buffer (64MB is too big for stack)
var transforms: ?[]rl.Matrix = null;
if (use_instancing) {
transforms = std.heap.page_allocator.alloc(rl.Matrix, sandbox.MAX_ENTITIES) catch {
std.debug.print("failed to allocate transforms buffer\n", .{});
return;
};
// create quad mesh (XZ plane, will view from above)
quad_mesh = rl.genMeshPlane(MESH_SIZE, MESH_SIZE, 1, 1);
rl.uploadMesh(&quad_mesh.?, false); // upload to GPU
@ -214,6 +218,7 @@ pub fn main() !void {
defer {
if (quad_mesh) |*m| rl.unloadMesh(m.*);
if (instance_material) |mat| mat.unload();
if (transforms) |t| std.heap.page_allocator.free(t);
}
// load UI font (embedded)
@ -298,15 +303,16 @@ pub fn main() !void {
if (use_instancing) {
// GPU instancing path
const xforms = transforms.?;
// fill transforms array with entity positions
for (entities.items[0..entities.count], 0..) |entity, i| {
// entity (x, y) maps to 3D (x, 0, y) on XZ plane
transforms[i] = rl.Matrix.translate(entity.x, 0, entity.y);
xforms[i] = rl.Matrix.translate(entity.x, 0, entity.y);
}
// draw all entities with single instanced call
ortho_camera.begin();
rl.drawMeshInstanced(quad_mesh.?, instance_material.?, transforms[0..entities.count]);
rl.drawMeshInstanced(quad_mesh.?, instance_material.?, xforms[0..entities.count]);
ortho_camera.end();
} else {
// rlgl quad batching path (original)