426 lines
16 KiB
Zig
426 lines
16 KiB
Zig
const std = @import("std");
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const vk = @import("vulkan");
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const base = @import("base");
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const zm = base.zm;
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const lib = @import("../lib.zig");
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const spv = @import("spv");
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pub const F32x4 = zm.F32x4;
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const PipelineState = @import("Device.zig").PipelineState;
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const SoftBuffer = @import("../SoftBuffer.zig");
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const SoftDescriptorSet = @import("../SoftDescriptorSet.zig");
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const SoftDevice = @import("../SoftDevice.zig");
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const SoftFramebuffer = @import("../SoftFramebuffer.zig");
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const SoftImage = @import("../SoftImage.zig");
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const SoftPipeline = @import("../SoftPipeline.zig");
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const SoftRenderPass = @import("../SoftRenderPass.zig");
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const blitter = @import("blitter.zig");
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const rasterizer = @import("rasterizer.zig");
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const vertex_dispatcher = @import("vertex_dispatcher.zig");
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const fragment_dispatcher = @import("fragment_dispatcher.zig");
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const VkError = base.VkError;
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const Self = @This();
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pub const VertexBuffer = struct {
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buffer: *const SoftBuffer,
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offset: usize,
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size: usize,
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};
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pub const IndexBuffer = struct {
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buffer: *const SoftBuffer,
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offset: usize,
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index_type: vk.IndexType,
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};
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pub const DynamicState = struct {
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viewports: ?[]const vk.Viewport,
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scissor: ?[]vk.Rect2D,
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line_width: ?f32,
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};
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pub const Vertex = struct {
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position: F32x4,
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outputs: [spv.SPIRV_MAX_OUTPUT_LOCATIONS]?struct {
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interpolation_type: enum { smooth, flat, noperspective },
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blob: []u8,
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},
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};
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pub const Fragment = struct {
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position: F32x4,
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color: F32x4,
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inputs: [spv.SPIRV_MAX_OUTPUT_LOCATIONS][]u8,
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};
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pub const DrawCall = struct {
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vertices: []Vertex,
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fragments: []Fragment,
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pub fn init(allocator: std.mem.Allocator, vertex_count: usize, instance_count: usize) VkError!@This() {
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const self: @This() = .{
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.vertices = allocator.alloc(Vertex, vertex_count * instance_count) catch return VkError.OutOfDeviceMemory,
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.fragments = undefined,
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};
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for (self.vertices) |*vertex| {
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@memset(vertex.outputs[0..], null);
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}
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return self;
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}
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};
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device: *SoftDevice,
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state: *PipelineState,
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render_pass: ?*SoftRenderPass,
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framebuffer: ?*SoftFramebuffer,
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dynamic_state: DynamicState,
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pub fn init(device: *SoftDevice, state: *PipelineState) Self {
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return .{
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.device = device,
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.state = state,
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.render_pass = null,
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.framebuffer = null,
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.dynamic_state = .{
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.viewports = null,
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.scissor = null,
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.line_width = null,
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},
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};
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}
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pub fn draw(self: *Self, vertex_count: usize, instance_count: usize, first_vertex: usize, first_instance: usize) VkError!void {
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const io = self.device.interface.io();
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var arena: std.heap.ArenaAllocator = .init(self.device.device_allocator.allocator());
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defer arena.deinit();
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const allocator = arena.allocator();
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var draw_call = try DrawCall.init(allocator, vertex_count, instance_count);
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const timer = std.Io.Timestamp.now(io, .real);
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defer if (comptime base.config.logs != .none) {
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const duration = timer.untilNow(io, .real);
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const ms = duration.toMicroseconds();
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const memory_footprint = @divTrunc(arena.queryCapacity(), 1000);
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const logger = std.log.scoped(.SoftwareRenderer);
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if (memory_footprint > 256_000)
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logger.warn("Drawcall stats:\n> Took {d}us\n> Allocated {d} KB", .{ ms, memory_footprint })
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else
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logger.debug("Drawcall stats:\n> Took {d}us\n> Allocated {d} KB", .{ ms, memory_footprint });
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};
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self.vertexShaderStage(allocator, &draw_call, vertex_count, instance_count, first_vertex, first_instance, null) catch |err| {
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std.log.scoped(.@"Vertex stage").err("catched a '{s}'", .{@errorName(err)});
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if (@errorReturnTrace()) |trace| {
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std.debug.dumpErrorReturnTrace(trace);
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}
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};
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try self.postVertexDraw(allocator, &draw_call);
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}
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pub fn drawIndexed(self: *Self, index_count: usize, instance_count: usize, first_index: usize, first_instance: usize, vertex_offset: i32) VkError!void {
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const io = self.device.interface.io();
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var arena: std.heap.ArenaAllocator = .init(self.device.device_allocator.allocator());
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defer arena.deinit();
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const allocator = arena.allocator();
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var draw_call = try DrawCall.init(allocator, index_count, instance_count);
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const indices = try self.readIndexBuffer(allocator, index_count, first_index, vertex_offset);
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const timer = std.Io.Timestamp.now(io, .real);
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defer if (comptime base.config.logs != .none) {
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const duration = timer.untilNow(io, .real);
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const ms = duration.toMicroseconds();
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const memory_footprint = @divTrunc(arena.queryCapacity(), 1000);
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const logger = std.log.scoped(.SoftwareRenderer);
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if (memory_footprint > 256_000)
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logger.warn("Drawcall indexed stats:\n> Took {d}us\n> Allocated {d} KB", .{ ms, memory_footprint })
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else
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logger.debug("Drawcall indexed stats:\n> Took {d}us\n> Allocated {d} KB", .{ ms, memory_footprint });
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};
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self.vertexShaderStage(allocator, &draw_call, index_count, instance_count, 0, first_instance, indices) catch |err| {
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std.log.scoped(.@"Vertex stage").err("catched a '{s}'", .{@errorName(err)});
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if (@errorReturnTrace()) |trace| {
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std.debug.dumpErrorReturnTrace(trace);
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}
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};
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try self.postVertexDraw(allocator, &draw_call);
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}
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pub fn deinit(self: *Self) void {
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_ = self;
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}
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fn vertexShaderStage(self: *Self, allocator: std.mem.Allocator, draw_call: *DrawCall, vertex_count: usize, instance_count: usize, first_vertex: usize, first_instance: usize, indices: ?[]const i32) !void {
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const pipeline = self.state.pipeline orelse return;
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const batch_size = (pipeline.stages.getPtr(.vertex) orelse return).runtimes.len;
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var wg: std.Io.Group = .init;
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for (0..instance_count) |instance_index| {
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for (0..@min(batch_size, vertex_count)) |batch_id| {
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const run_data: vertex_dispatcher.RunData = .{
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.allocator = allocator,
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.renderer = self,
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.pipeline = pipeline,
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.batch_id = batch_id,
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.batch_size = batch_size,
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.vertex_count = vertex_count,
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.first_vertex = first_vertex,
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.first_instance = first_instance,
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.indices = indices,
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.instance_index = instance_index,
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.draw_call = draw_call,
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};
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wg.async(self.device.interface.io(), vertex_dispatcher.runWrapper, .{run_data});
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}
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}
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wg.await(self.device.interface.io()) catch return VkError.DeviceLost;
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}
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fn postVertexDraw(self: *Self, allocator: std.mem.Allocator, draw_call: *DrawCall) VkError!void {
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const render_target_view: *base.ImageView = (self.framebuffer orelse return).interface.attachments[0];
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const render_target: *SoftImage = @alignCast(@fieldParentPtr("interface", render_target_view.image));
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try self.primitiveAssemblyStage(draw_call);
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try self.rasterizationStage(allocator, draw_call);
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self.fragmentShaderStage(draw_call) catch |err| {
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std.log.scoped(.@"Fragment stage").err("catched a '{s}'", .{@errorName(err)});
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if (@errorReturnTrace()) |trace| {
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std.debug.dumpErrorReturnTrace(trace);
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}
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};
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for (draw_call.fragments) |fragment| {
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try render_target.writeFloat4(
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.{
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.x = @intFromFloat(fragment.position[0]),
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.y = @intFromFloat(fragment.position[1]),
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.z = 0, // FIXME
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},
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.{
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.aspect_mask = render_target_view.subresource_range.aspect_mask,
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.mip_level = render_target_view.subresource_range.base_mip_level,
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.array_layer = render_target_view.subresource_range.base_array_layer,
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},
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render_target_view.format,
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fragment.color,
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);
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}
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}
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fn primitiveAssemblyStage(self: *Self, draw_call: *DrawCall) VkError!void {
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const viewport = blk: {
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const pipeline_data = &(self.state.pipeline orelse return VkError.InvalidPipelineDrv).interface.mode.graphics;
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if (pipeline_data.dynamic_state.viewport) {
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if (self.dynamic_state.viewports) |viewports|
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break :blk viewports[0];
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}
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if (pipeline_data.viewport_state.viewports) |viewports|
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break :blk viewports[0];
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return VkError.Unknown;
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};
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for (draw_call.vertices) |*vertex| {
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const x = vertex.position[0];
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const y = vertex.position[1];
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const z = vertex.position[2];
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const w = vertex.position[3];
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// Perspective division.
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const x_ndc = x / w;
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const y_ndc = y / w;
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const z_ndc = z / w;
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const p_x = viewport.width;
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const p_y = viewport.height;
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const p_z = viewport.max_depth - viewport.min_depth;
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const o_x = viewport.x + viewport.width / 2.0;
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const o_y = viewport.y + viewport.height / 2.0;
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const o_z = viewport.min_depth;
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const x_screen = ((p_x / 2.0) * x_ndc) + o_x;
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const y_screen = ((p_y / 2.0) * y_ndc) + o_y;
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const z_screen = (p_z * z_ndc) + o_z;
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vertex.position = zm.f32x4(x_screen, y_screen, z_screen, 1.0);
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}
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}
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fn rasterizationStage(self: *Self, allocator: std.mem.Allocator, draw_call: *DrawCall) VkError!void {
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var fragments: std.ArrayList(Fragment) = .empty;
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const pipeline_data = (self.state.pipeline orelse return VkError.InvalidHandleDrv).interface.mode.graphics;
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const topology = pipeline_data.input_assembly.topology;
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switch (topology) {
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.triangle_list => for (0..@divTrunc(draw_call.vertices.len, 3)) |triangle_index| {
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const first_vertex = triangle_index * 3;
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const v0 = &draw_call.vertices[first_vertex + 0];
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const v1 = &draw_call.vertices[first_vertex + 1];
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const v2 = &draw_call.vertices[first_vertex + 2];
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try self.rasterizeTriangle(allocator, &fragments, v0, v1, v2, v0, v1, v2);
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},
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.triangle_fan => if (draw_call.vertices.len >= 3) {
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const v0 = &draw_call.vertices[0];
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for (1..(draw_call.vertices.len - 1)) |vertex_index| {
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const v1 = &draw_call.vertices[vertex_index];
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const v2 = &draw_call.vertices[vertex_index + 1];
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try self.rasterizeTriangle(allocator, &fragments, v0, v1, v2, v0, v1, v2);
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}
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},
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.triangle_strip => if (draw_call.vertices.len >= 3) {
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for (0..(draw_call.vertices.len - 2)) |vertex_index| {
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const v0 = &draw_call.vertices[vertex_index + 0];
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const v1 = &draw_call.vertices[vertex_index + 1];
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const v2 = &draw_call.vertices[vertex_index + 2];
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if ((vertex_index & 1) == 0) {
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try self.rasterizeTriangle(allocator, &fragments, v0, v1, v2, v0, v1, v2);
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} else {
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try self.rasterizeTriangle(allocator, &fragments, v0, v1, v2, v1, v0, v2);
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}
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}
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},
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else => base.unsupported("primitive topology {any}", .{topology}),
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}
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draw_call.fragments = fragments.toOwnedSlice(allocator) catch return VkError.OutOfDeviceMemory;
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}
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fn rasterizeTriangle(
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self: *Self,
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allocator: std.mem.Allocator,
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fragments: *std.ArrayList(Fragment),
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v0: *Vertex,
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v1: *Vertex,
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v2: *Vertex,
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cull_v0: *const Vertex,
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cull_v1: *const Vertex,
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cull_v2: *const Vertex,
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) VkError!void {
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if (try self.triangleIsCulled(cull_v0, cull_v1, cull_v2))
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return;
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const pipeline_data = (self.state.pipeline orelse return VkError.InvalidHandleDrv).interface.mode.graphics;
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switch (pipeline_data.rasterization.polygon_mode) {
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.fill => try rasterizer.drawTriangleFilled(allocator, fragments, v0, v1, v2),
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.line => {
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try rasterizer.drawLineBresenham(allocator, fragments, v0, v1);
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try rasterizer.drawLineBresenham(allocator, fragments, v1, v2);
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try rasterizer.drawLineBresenham(allocator, fragments, v2, v0);
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},
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.point => {},
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else => base.unsupported("polygon mode {any}", .{pipeline_data.rasterization.polygon_mode}),
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}
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}
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fn fragmentShaderStage(self: *Self, draw_call: *DrawCall) !void {
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const pipeline = self.state.pipeline orelse return;
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const batch_size = (pipeline.stages.getPtr(.fragment) orelse return).runtimes.len;
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const fragment_count = draw_call.fragments.len;
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var wg: std.Io.Group = .init;
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for (0..@min(batch_size, fragment_count)) |batch_id| {
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const run_data: fragment_dispatcher.RunData = .{
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.renderer = self,
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.pipeline = pipeline,
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.batch_id = batch_id,
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.batch_size = batch_size,
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.fragment_count = fragment_count,
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.draw_call = draw_call,
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};
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wg.async(self.device.interface.io(), fragment_dispatcher.runWrapper, .{run_data});
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}
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wg.await(self.device.interface.io()) catch return VkError.DeviceLost;
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}
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fn readIndexBuffer(self: *Self, allocator: std.mem.Allocator, index_count: usize, first_index: usize, vertex_offset: i32) VkError![]i32 {
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const index_buffer = self.state.data.graphics.index_buffer;
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const buffer = index_buffer.buffer;
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const buffer_memory = if (buffer.interface.memory) |memory| memory else return VkError.InvalidDeviceMemoryDrv;
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const index_size = indexTypeSize(index_buffer.index_type) orelse {
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base.unsupported("index type {any}", .{index_buffer.index_type});
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return VkError.Unknown;
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};
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const byte_offset = buffer.interface.offset + index_buffer.offset + (first_index * index_size);
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const byte_size = index_count * index_size;
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const index_memory: []const u8 = @as([*]const u8, @ptrCast(@alignCast(try buffer_memory.map(byte_offset, byte_size))))[0..byte_size];
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const indices = allocator.alloc(i32, index_count) catch return VkError.OutOfDeviceMemory;
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for (indices, 0..) |*index, i| {
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const offset = i * index_size;
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const raw_index: u32 = switch (index_size) {
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1 => index_memory[offset],
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2 => std.mem.readInt(u16, index_memory[offset..][0..2], .little),
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4 => @intCast(std.mem.readInt(u32, index_memory[offset..][0..4], .little)),
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else => unreachable,
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};
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index.* = vertex_offset + @as(i32, @intCast(raw_index));
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}
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return indices;
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}
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fn indexTypeSize(index_type: vk.IndexType) ?usize {
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return switch (index_type) {
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.uint8 => 1,
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.uint16 => 2,
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.uint32 => 4,
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else => null,
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};
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}
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fn triangleArea2(v0: *const Vertex, v1: *const Vertex, v2: *const Vertex) f32 {
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const x0 = v0.position[0];
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const y0 = v0.position[1];
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const x1 = v1.position[0];
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const y1 = v1.position[1];
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const x2 = v2.position[0];
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const y2 = v2.position[1];
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return ((x1 - x0) * (y2 - y0)) - ((y1 - y0) * (x2 - x0));
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}
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fn triangleIsCulled(self: *Self, v0: *const Vertex, v1: *const Vertex, v2: *const Vertex) VkError!bool {
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const pipeline_data = (self.state.pipeline orelse return VkError.InvalidHandleDrv).interface.mode.graphics;
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const rasterization = pipeline_data.rasterization;
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const cull_mode = rasterization.cull_mode;
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if (!cull_mode.front_bit and !cull_mode.back_bit)
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return false;
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if (cull_mode.front_bit and cull_mode.back_bit)
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return true;
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const area = triangleArea2(v0, v1, v2);
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if (area == 0.0)
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return true;
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const front_face = switch (rasterization.front_face) {
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.counter_clockwise => area < 0.0,
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.clockwise => area > 0.0,
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else => return false,
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};
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return (cull_mode.front_bit and front_face) or (cull_mode.back_bit and !front_face);
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}
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