Initial pipeline work

2026-07-31 19:11:19 -07:00
parent 742cfcff6a
commit ebb6ea383f
8 changed files with 475 additions and 54 deletions
@@ -3,9 +3,29 @@ package engine
 import "core:fmt"
 import sdl "vendor:sdl3"

+Vertex :: struct {
+	pos: [2]f32, // clip space, -1..1
+	uv:  [2]f32, // 0..1 atlas coords (used later in draw_sprite)
+}
+
+SPRITE_VERT_COUNT :: 6
+VERTEX_BUFFER_SIZE :: SPRITE_VERT_COUNT * size_of(Vertex)
+
+VERT_SPV := #load("../shaders/sprite.vert.spv")
+FRAG_SPV := #load("../shaders/sprite.frag.spv")
+
 App :: struct {
-	window:   ^sdl.Window,
-	renderer: ^sdl.Renderer,
+	window:            ^sdl.Window,
+	device:            ^sdl.GPUDevice,
+	pipeline:          ^sdl.GPUGraphicsPipeline,
+	sampler:           ^sdl.GPUSampler,
+	cmd:               ^sdl.GPUCommandBuffer,
+	render_pass:       ^sdl.GPURenderPass,
+	swapchain_texture: ^sdl.GPUTexture,
+	swapchain_w:       u32,
+	swapchain_h:       u32,
+	vertex_buffer:     ^sdl.GPUBuffer,
+	transfer_buffer:   ^sdl.GPUTransferBuffer,
 }

 init :: proc(app: ^App, title: cstring, width, height: i32) -> bool {
@@ -14,8 +34,64 @@ init :: proc(app: ^App, title: cstring, width, height: i32) -> bool {
 		return false
 	}

-	if !sdl.CreateWindowAndRenderer(title, width, height, {}, &app.window, &app.renderer) {
-		fmt.eprintfln("CreateWindowAndRenderer failed: %s", sdl.GetError())
+	app.window = sdl.CreateWindow(title, width, height, {})
+
+	if app.window == nil {
+		fmt.eprintfln("CreateWindow failed: %s", sdl.GetError())
+		return false
+	}
+
+	app.device = sdl.CreateGPUDevice({.SPIRV}, true, nil)
+	if app.device == nil {
+		fmt.eprintfln("CreateGPUDevice failed: %s", sdl.GetError())
+		return false
+	}
+
+	if !sdl.ClaimWindowForGPUDevice(app.device, app.window) {
+		fmt.eprintfln("ClaimWindowForGPUDevice failed: %s", sdl.GetError())
+		return false
+	}
+
+	app.pipeline = create_sprite_pipeline(app.device, app.window)
+	if app.pipeline == nil {
+		fmt.eprintfln("create_sprite_pipeline failed: %s", sdl.GetError())
+		return false
+	}
+
+	app.sampler = sdl.CreateGPUSampler(
+		app.device,
+		{
+			min_filter = .NEAREST,
+			mag_filter = .NEAREST,
+			mipmap_mode = .NEAREST,
+			address_mode_u = .CLAMP_TO_EDGE,
+			address_mode_v = .CLAMP_TO_EDGE,
+			address_mode_w = .CLAMP_TO_EDGE,
+		},
+	)
+
+	if app.sampler == nil {
+		fmt.eprintfln("CreateGPUSampler failed: %s", sdl.GetError())
+		return false
+	}
+
+	app.vertex_buffer = sdl.CreateGPUBuffer(
+		app.device,
+		{usage = {.VERTEX}, size = VERTEX_BUFFER_SIZE},
+	)
+
+	if app.vertex_buffer == nil {
+		fmt.eprintfln("CreateGPUBuffer failed: %s", sdl.GetError())
+		return false
+	}
+
+	app.transfer_buffer = sdl.CreateGPUTransferBuffer(
+		app.device,
+		{usage = .UPLOAD, size = VERTEX_BUFFER_SIZE},
+	)
+
+	if app.transfer_buffer == nil {
+		fmt.eprintfln("CreateGPUTransferBuffer failed: %s", sdl.GetError())
 		return false
 	}

@@ -23,14 +99,43 @@ init :: proc(app: ^App, title: cstring, width, height: i32) -> bool {
 }

 shutdown :: proc(app: ^App) {
-	if app.renderer != nil do sdl.DestroyRenderer(app.renderer)
-	if app.window != nil do sdl.DestroyWindow(app.window)
+	if app.device != nil {
+		ok := sdl.WaitForGPUIdle(app.device)
+		if !ok {
+			fmt.eprintfln("WaitForGPUIdle failed")
+		}
+
+		if app.transfer_buffer != nil {
+			sdl.ReleaseGPUTransferBuffer(app.device, app.transfer_buffer)
+		}
+
+		if app.vertex_buffer != nil {
+			sdl.ReleaseGPUBuffer(app.device, app.vertex_buffer)
+		}
+
+		if app.sampler != nil {
+			sdl.ReleaseGPUSampler(app.device, app.sampler)
+		}
+
+		if app.pipeline != nil {
+			sdl.ReleaseGPUGraphicsPipeline(app.device, app.pipeline)
+		}
+
+		if app.window != nil {
+			sdl.ReleaseWindowFromGPUDevice(app.device, app.window)
+		}
+		sdl.DestroyGPUDevice(app.device)
+	}
+
+	if app.window != nil {
+		sdl.DestroyWindow(app.window)
+	}

 	sdl.Quit()
 	app^ = {}
 }

-pump_events :: proc() -> bool {
+events :: proc() -> bool {
 	event: sdl.Event

 	for sdl.PollEvent(&event) {
@@ -42,15 +147,137 @@ pump_events :: proc() -> bool {
 	return true
 }

-begin_frame :: proc(app: ^App, r: u8 = 30, g: u8 = 30, b: u8 = 40, a: u8 = 255) {
-	sdl.SetRenderDrawColor(app.renderer, r, g, b, a)
-	sdl.RenderClear(app.renderer)
+begin_frame :: proc(app: ^App, clear: sdl.FColor = {0.12, 0.12, 0.16, 1}) {
+	app.cmd = sdl.AcquireGPUCommandBuffer(app.device)
+
+	if app.cmd == nil {
+		fmt.eprintfln("AcquireGPUCommandBuffer failed: %s", sdl.GetError())
+		return
+	}
+
+	ok := sdl.WaitAndAcquireGPUSwapchainTexture(
+		app.cmd,
+		app.window,
+		&app.swapchain_texture,
+		&app.swapchain_w,
+		&app.swapchain_h,
+	)
+
+	if !ok || app.swapchain_texture == nil {
+		return
+	}
+
+	color_info := sdl.GPUColorTargetInfo {
+		texture     = app.swapchain_texture,
+		clear_color = clear,
+		load_op     = .CLEAR,
+		store_op    = .STORE,
+	}
+
+	app.render_pass = sdl.BeginGPURenderPass(app.cmd, &color_info, 1, nil)
+
+	sdl.BindGPUGraphicsPipeline(app.render_pass, app.pipeline)
 }

 end_frame :: proc(app: ^App) {
-	sdl.RenderPresent(app.renderer)
+	if app.render_pass != nil {
+		sdl.EndGPURenderPass(app.render_pass)
+		app.render_pass = nil
+	}
+
+	if app.cmd != nil {
+		ok := sdl.SubmitGPUCommandBuffer(app.cmd)
+		if !ok {
+			fmt.eprintfln("SubmitGPUCommandBuffer failed")
+		}
+		app.cmd = nil
+	}
+
+	app.swapchain_texture = nil
 }

-renderer :: proc(app: ^App) -> ^sdl.Renderer {
-	return app.renderer
+load_spirv_shader :: proc(
+	device: ^sdl.GPUDevice,
+	code: []u8,
+	stage: sdl.GPUShaderStage,
+	num_samplers: u32,
+) -> ^sdl.GPUShader {
+	return sdl.CreateGPUShader(
+		device,
+		{
+			code_size = len(code),
+			code = raw_data(code),
+			entrypoint = "main",
+			format = {.SPIRV},
+			stage = stage,
+			num_samplers = num_samplers,
+			num_storage_textures = 0,
+			num_storage_buffers = 0,
+			num_uniform_buffers = 0,
+		},
+	)
+}
+
+create_sprite_pipeline :: proc(
+	device: ^sdl.GPUDevice,
+	window: ^sdl.Window,
+) -> ^sdl.GPUGraphicsPipeline {
+	vert := load_spirv_shader(device, VERT_SPV[:], .VERTEX, 0)
+	if vert == nil do return nil
+
+	frag := load_spirv_shader(device, FRAG_SPV[:], .FRAGMENT, 1)
+	if frag == nil {
+		sdl.ReleaseGPUShader(device, vert)
+		return nil
+	}
+
+	swap_format := sdl.GetGPUSwapchainTextureFormat(device, window)
+
+
+	blend := sdl.GPUColorTargetBlendState {
+		src_color_blendfactor = .SRC_ALPHA,
+		dst_color_blendfactor = .ONE_MINUS_SRC_ALPHA,
+		color_blend_op        = .ADD,
+		src_alpha_blendfactor = .ONE,
+		dst_alpha_blendfactor = .ONE_MINUS_SRC_ALPHA,
+		alpha_blend_op        = .ADD,
+		enable_blend          = true,
+	}
+
+	color_target := sdl.GPUColorTargetDescription {
+		format      = swap_format,
+		blend_state = blend,
+	}
+
+	vb_desc := sdl.GPUVertexBufferDescription {
+		slot       = 0,
+		pitch      = u32(size_of(Vertex)),
+		input_rate = .VERTEX,
+	}
+
+	attrs := [2]sdl.GPUVertexAttribute {
+		{location = 0, buffer_slot = 0, format = .FLOAT2, offset = 0},
+		{location = 1, buffer_slot = 0, format = .FLOAT2, offset = u32(offset_of(Vertex, uv))},
+	}
+
+	pipeline_info := sdl.GPUGraphicsPipelineCreateInfo {
+		vertex_shader = vert,
+		fragment_shader = frag,
+		vertex_input_state = {
+			vertex_buffer_descriptions = &vb_desc,
+			num_vertex_buffers = 1,
+			vertex_attributes = raw_data(attrs[:]),
+			num_vertex_attributes = 2,
+		},
+		primitive_type = .TRIANGLELIST,
+		rasterizer_state = {fill_mode = .FILL},
+		target_info = {color_target_descriptions = &color_target, num_color_targets = 1},
+	}
+
+	pipeline := sdl.CreateGPUGraphicsPipeline(device, pipeline_info)
+
+	sdl.ReleaseGPUShader(device, vert)
+	sdl.ReleaseGPUShader(device, frag)
+
+	return pipeline
 }