duck-that-quacks/spacefarer
1
0
Fork 0
Code Issues 7 Pull Requests Actions Packages Projects 1 Releases Wiki Activity

Draw call batching for improved performance

Browse Source
This commit is contained in:
duck
2025-09-21 21:30:02 +05:00
parent 49267e629f
commit 9d3a98b2d9
1 changed files with 80 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

116
src/graphics.zig
View File

@@ -2,6 +2,7 @@ const std = @import("std");
const sdl = @import("sdl");
const err = @import("error.zig");
const presets = @import("graphics/presets.zig");
const Game = @import("game.zig");
const Assets = @import("assets.zig");
pub const Transform = @import("graphics/transform.zig");
@@ -14,6 +15,7 @@ var command_buffer: ?*sdl.GPUCommandBuffer = null;
var render_pass: ?*sdl.GPURenderPass = null;
var render_target: ?*sdl.GPUTexture = null;
var render_fsaa: bool = undefined;
var batches: Batches = undefined;
var shader_vert: *sdl.GPUShader = undefined;
var shader_frag: *sdl.GPUShader = undefined;
@@ -38,6 +40,18 @@ const DEPTH_FORMAT = sdl.GPU_TEXTUREFORMAT_D32_FLOAT;
pub const TRANSFER_BUFFER_DEFAULT_CAPACITY = 512 * 1024;
pub const MIP_LEVEL = 4;
const Batch = struct {
object: *Assets.Object,
transform: Transform,
z: f32,
fn orderLessThan(ctx: void, lhs: Batch, rhs: Batch) bool {
_ = ctx;
return lhs.z > rhs.z;
}
};
const Batches = std.ArrayListUnmanaged(Batch);
const Graphics = @This();
pub fn create() void {
// Init
@@ -150,6 +164,8 @@ pub fn create() void {
},
}) orelse err.sdl();
Graphics.batches = Batches.empty;
Graphics.camera = Camera{
.transform = .{},
.near = 1.0 / 16.0,
@@ -175,6 +191,7 @@ pub fn destroy() void {
Graphics.command_buffer = null;
}
sdl.DestroyGPUDevice(Graphics.device);
Graphics.batches.clearAndFree(Game.alloc);
}
/// If window is minimized returns `false`, `render_pass` remains null
@@ -219,8 +236,35 @@ pub fn beginDraw() bool {
return true;
}
pub fn clearDepth() void {
fn finishPass() void {
std.sort.block(Batch, Graphics.batches.items, {}, Batch.orderLessThan);
for (Graphics.batches.items) |*batch| {
const asset_object = batch.object.get() orelse continue;
sdl.PushGPUVertexUniformData(Graphics.command_buffer, 1, &batch.transform.matrix(), 16 * 4);
for (asset_object.nodes) |node| {
const mesh = &asset_object.meshes[node.mesh];
for (mesh.primitives) |*primitive| {
const asset_texture = primitive.texture.get() orelse continue;
sdl.BindGPUFragmentSamplers(Graphics.render_pass, 0, &sdl.GPUTextureSamplerBinding{
.texture = asset_texture.texture,
.sampler = asset_texture.sampler,
}, 1);
sdl.BindGPUVertexBuffers(Graphics.render_pass, 0, &.{ .offset = 0, .buffer = primitive.vertex_buffer }, 1);
sdl.BindGPUIndexBuffer(Graphics.render_pass, &.{ .buffer = primitive.index_buffer }, sdl.GPU_INDEXELEMENTSIZE_16BIT);
sdl.DrawGPUIndexedPrimitives(Graphics.render_pass, primitive.indices, 1, 0, 0, 0);
}
}
}
Graphics.batches.clearRetainingCapacity();
sdl.EndGPURenderPass(Graphics.render_pass.?);
}
pub fn clearDepth() void {
Graphics.finishPass();
Graphics.render_pass = sdl.BeginGPURenderPass(Graphics.command_buffer.?, &.{
.clear_color = .{ .r = 0.0, .g = 0.0, .b = 0.0, .a = 1.0 },
@@ -242,51 +286,51 @@ pub fn clearDepth() void {
sdl.PushGPUVertexUniformData(Graphics.command_buffer, 0, &Graphics.camera.matrix, 16 * 4);
}
// `object`: pointer MUST be vaild until current render pass ends
pub fn drawObject(object: *Assets.Object, transform: Transform) void {
if (Graphics.render_pass == null) return;
const asset_object = object.get() orelse return;
sdl.PushGPUVertexUniformData(Graphics.command_buffer, 1, &transform.matrix(), 16 * 4);
for (asset_object.nodes) |node| {
const mesh = &asset_object.meshes[node.mesh];
@setFloatMode(.optimized);
const z = Graphics.camera.matrix[8] * transform.position[0] +
Graphics.camera.matrix[9] * transform.position[1] +
Graphics.camera.matrix[10] * transform.position[2] +
Graphics.camera.matrix[11];
var w = Graphics.camera.matrix[12] * transform.position[0] +
Graphics.camera.matrix[13] * transform.position[1] +
Graphics.camera.matrix[14] * transform.position[2] +
Graphics.camera.matrix[15];
if (w == 0) w = 1;
for (mesh.primitives) |*primitive| {
const asset_texture = primitive.texture.get() orelse continue;
sdl.BindGPUFragmentSamplers(Graphics.render_pass, 0, &sdl.GPUTextureSamplerBinding{
.texture = asset_texture.texture,
.sampler = asset_texture.sampler,
}, 1);
sdl.BindGPUVertexBuffers(Graphics.render_pass, 0, &.{ .offset = 0, .buffer = primitive.vertex_buffer }, 1);
sdl.BindGPUIndexBuffer(Graphics.render_pass, &.{ .buffer = primitive.index_buffer }, sdl.GPU_INDEXELEMENTSIZE_16BIT);
sdl.DrawGPUIndexedPrimitives(Graphics.render_pass, primitive.indices, 1, 0, 0, 0);
}
}
Graphics.batches.append(Game.alloc, .{
.object = object,
.transform = transform,
.z = z / w,
}) catch err.oom();
}
pub fn endDraw() void {
defer Graphics.command_buffer = null;
defer Graphics.render_pass = null;
if (Graphics.render_pass) |pass| {
sdl.EndGPURenderPass(pass);
if (Graphics.render_fsaa) {
sdl.GenerateMipmapsForGPUTexture(Graphics.command_buffer, Graphics.fsaa_target);
sdl.BlitGPUTexture(Graphics.command_buffer, &.{
.source = .{
.texture = Graphics.fsaa_target,
.w = Graphics.render_width,
.h = Graphics.render_height,
.mip_level = fsaa_level - 1,
},
.destination = .{
.texture = Graphics.render_target,
.w = Graphics.render_width,
.h = Graphics.render_height,
},
.load_op = sdl.GPU_LOADOP_DONT_CARE,
.filter = sdl.GPU_FILTER_NEAREST,
});
}
Graphics.finishPass();
if (Graphics.render_fsaa) {
sdl.GenerateMipmapsForGPUTexture(Graphics.command_buffer, Graphics.fsaa_target);
sdl.BlitGPUTexture(Graphics.command_buffer, &.{
.source = .{
.texture = Graphics.fsaa_target,
.w = Graphics.render_width,
.h = Graphics.render_height,
.mip_level = fsaa_level - 1,
},
.destination = .{
.texture = Graphics.render_target,
.w = Graphics.render_width,
.h = Graphics.render_height,
},
.load_op = sdl.GPU_LOADOP_DONT_CARE,
.filter = sdl.GPU_FILTER_NEAREST,
});
}
if (!sdl.SubmitGPUCommandBuffer(Graphics.command_buffer)) err.sdl();
}