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Swap static buffer for heap-allocated

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Jared Miller 2025-12-15 22:02:48 -05:00
parent 3a54b0dde3
commit 1c0f552032
1 changed files with 10 additions and 4 deletions
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14
src/sandbox_main.zig
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@ -191,10 +191,14 @@ pub fn main() !void {
var instance_material: ?rl.Material = null; var instance_material: ?rl.Material = null;
var ortho_camera: rl.Camera3D = undefined; var ortho_camera: rl.Camera3D = undefined;
// static buffer for transforms - allocated once, reused each frame // heap-allocated transforms buffer (64MB is too big for stack)
var transforms: [sandbox.MAX_ENTITIES]rl.Matrix = undefined; var transforms: ?[]rl.Matrix = null;
if (use_instancing) { 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) // create quad mesh (XZ plane, will view from above)
quad_mesh = rl.genMeshPlane(MESH_SIZE, MESH_SIZE, 1, 1); quad_mesh = rl.genMeshPlane(MESH_SIZE, MESH_SIZE, 1, 1);
rl.uploadMesh(&quad_mesh.?, false); // upload to GPU rl.uploadMesh(&quad_mesh.?, false); // upload to GPU
@ -214,6 +218,7 @@ pub fn main() !void {
defer { defer {
if (quad_mesh) |*m| rl.unloadMesh(m.*); if (quad_mesh) |*m| rl.unloadMesh(m.*);
if (instance_material) |mat| mat.unload(); if (instance_material) |mat| mat.unload();
if (transforms) |t| std.heap.page_allocator.free(t);
} }
// load UI font (embedded) // load UI font (embedded)
@ -298,15 +303,16 @@ pub fn main() !void {
if (use_instancing) { if (use_instancing) {
// GPU instancing path // GPU instancing path
const xforms = transforms.?;
// fill transforms array with entity positions // fill transforms array with entity positions
for (entities.items[0..entities.count], 0..) |entity, i| { for (entities.items[0..entities.count], 0..) |entity, i| {
// entity (x, y) maps to 3D (x, 0, y) on XZ plane // 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 // draw all entities with single instanced call
ortho_camera.begin(); 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(); ortho_camera.end();
} else { } else {
// rlgl quad batching path (original) // rlgl quad batching path (original)