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package main
import "core:fmt"
import "core:mem"
import "core:os"
import bk "../../backend"
import compiler "../../compiler"
import gpu "../.."
import proof "../parity_common"
import ir "../../render_ir"
import resource "../../resource"
WIDTH :: u32(256)
HEIGHT :: u32(256)
VERTEX_SHADER :: `
@varying
struct VertexOutput
@builtin(position) position: vec4
end
@entry(vertex)
function main(@location(0) pos: vec3, @location(1) normal: vec3, @location(2) uv: vec2) -> VertexOutput
return VertexOutput {
position = vec4(pos, 1.0),
}
end
`
FRAGMENT_SHADER :: `
struct FragmentOutput
color: vec4
end
@entry(fragment)
function main() -> FragmentOutput
return FragmentOutput {
color = vec4(240.0 / 255.0, 48.0 / 255.0, 96.0 / 255.0, 1.0),
}
end
`
quad_vertices :: proc(x0, y0, x1, y1: f32) -> [6]resource.Mesh_Vertex_PNU {
n := [3]f32{0, 0, 1}
return {
{position = {x0, y0, 0}, normal = n, tex_coord = {0, 0}},
{position = {x1, y0, 0}, normal = n, tex_coord = {1, 0}},
{position = {x1, y1, 0}, normal = n, tex_coord = {1, 1}},
{position = {x0, y0, 0}, normal = n, tex_coord = {0, 0}},
{position = {x1, y1, 0}, normal = n, tex_coord = {1, 1}},
{position = {x0, y1, 0}, normal = n, tex_coord = {0, 1}},
}
}
write_vertices :: proc(backend: ^bk.Backend, buffer: bk.Buffer_Handle, vertices: []resource.Mesh_Vertex_PNU) -> bool {
ptr := backend.map_buffer(buffer)
if ptr == nil {
return false
}
defer backend.unmap_buffer(buffer)
mem.copy(ptr, raw_data(vertices), len(vertices) * size_of(resource.Mesh_Vertex_PNU))
return true
}
write_ppm_rgba8 :: proc(path: string, rgba: []u8, width, height: u32) -> bool {
if len(path) == 0 || len(rgba) < int(width * height * 4) {
return false
}
header := "P6\n256 256\n255\n"
out := make([]u8, len(header) + int(width * height * 3))
defer delete(out)
for i in 0..<len(header) {
out[i] = header[i]
}
dst := len(header)
for i in 0..<int(width * height) {
out[dst + i * 3 + 0] = rgba[i * 4 + 0]
out[dst + i * 3 + 1] = rgba[i * 4 + 1]
out[dst + i * 3 + 2] = rgba[i * 4 + 2]
}
err := os.write_entire_file(path, out)
return err == nil
}
fail :: proc(message: string) {
fmt.println(message)
os.exit(1)
}
make_frame :: proc(negative: bool) -> (
frame: ir.Frame_IR,
color: ir.Resource_Handle,
geometry: ir.Resource_Handle,
coverage: ir.Resource_Handle,
) {
frame = ir.init_frame_ir()
color = ir.add_texture(&frame, "proof-color", WIDTH, HEIGHT, .R8G8B8A8_UNORM, {.Color_Attachment, .Sampled}, .Transient)
depth := ir.add_texture(&frame, "proof-depth-stencil", WIDTH, HEIGHT, .D24_UNORM_S8_UINT, {.Depth_Stencil_Attachment}, .Transient)
geometry = ir.add_buffer(
&frame,
"foreground-geometry",
u64(6 * size_of(resource.Mesh_Vertex_PNU)),
{.Vertex},
{.Host_Visible, .Host_Coherent},
.Transient,
)
coverage = ir.add_buffer(
&frame,
"mask-coverage",
u64(6 * size_of(resource.Mesh_Vertex_PNU)),
{.Vertex},
{.Host_Visible, .Host_Coherent},
.Transient,
)
pass_desc := ir.Pass_Desc{kind = .Render, name = "stencil-proof"}
_ = ir.pass_add_color_target(
&pass_desc,
ir.make_color_target(color, .R8G8B8A8_UNORM, .Clear, .Store, {16.0 / 255.0, 16.0 / 255.0, 24.0 / 255.0, 1}),
)
ir.pass_set_depth_target(&pass_desc, ir.make_depth_target(depth, .D24_UNORM_S8_UINT, .Clear, .Store, 1))
ir.pass_set_viewport(&pass_desc, {x = 0, y = 0, width = f32(WIDTH), height = f32(HEIGHT), min_depth = 0, max_depth = 1})
ir.pass_set_scissor(&pass_desc, {x = 0, y = 0, width = WIDTH, height = HEIGHT})
pass := ir.add_pass(&frame, pass_desc)
target := ir.add_target(
&frame,
{
kind = .Offscreen,
name = "stencil-proof-target",
width = WIDTH,
height = HEIGHT,
pass = pass,
color_format = .R8G8B8A8_UNORM,
depth_format = .D24_UNORM_S8_UINT,
color_resource = color,
depth_resource = depth,
clear_color = {16.0 / 255.0, 16.0 / 255.0, 24.0 / 255.0, 1},
clear_depth = 1,
},
)
vs := ir.add_shader_source(&frame, "parity_stencil_clip.vert", .Vertex, VERTEX_SHADER)
fs := ir.add_shader_source(&frame, "parity_stencil_clip.frag", .Fragment, FRAGMENT_SHADER)
state := ir.default_graphics_pipeline_state()
state.vertex_shader = vs
state.fragment_shader = fs
state.color_format = .R8G8B8A8_UNORM
state.cull_mode = .None
state.enable_blending = false
pipeline := ir.add_graphics_pipeline(&frame, "foreground", state)
mask := ir.add_mask(
&frame,
{
target = target,
name = "center-mask",
source_kind = .Geometry_Coverage,
layout_variant = .PNU,
coverage_resource = coverage,
vertex_count = 6,
},
)
clip := ir.INVALID_CLIP
if !negative {
clip = ir.add_clip(&frame, {target = target, kind = .Mask, mask = mask})
}
_ = ir.add_draw_packet(
&frame,
pass,
pipeline,
.Vertex_Stream,
{
target = target,
clip = clip,
geometry = {kind = .Vertex_Stream, resource = geometry, vertex_count = 6},
order = .Strict,
},
)
return
}
main :: proc() {
runtime, ok := proof.init_runtime(WIDTH, HEIGHT, "GPU parity stencil clip")
if !ok {
fail("parity_stencil_clip: failed to initialize proof runtime")
}
defer proof.shutdown_runtime(&runtime)
backend := gpu.get_backend()
if backend == nil || backend.read_texture_rgba8 == nil {
fail("parity_stencil_clip: backend readback unsupported")
}
mode := os.get_env("GPU_PROOF_MODE", context.allocator)
readback_path := os.get_env("GPU_PROOF_READBACK", context.allocator)
profile_path := os.get_env("GPU_PROFILE_JSON", context.allocator)
negative := mode == "negative"
frame, color, geometry, coverage := make_frame(negative)
defer ir.destroy_frame_ir(&frame)
exec := compiler.init_execution_state(backend)
defer compiler.destroy_execution_state(&exec)
if !compiler.prepare_planned_frame(&exec, &frame) {
fail("parity_stencil_clip: failed to prepare planned frame")
}
foreground := quad_vertices(-1, -1, 1, 1)
mask := quad_vertices(-0.5, -0.5, 0.5, 0.5)
foreground_buffer, fg_ok := compiler.prepared_buffer(&exec, geometry)
mask_buffer, mask_ok := compiler.prepared_buffer(&exec, coverage)
if !fg_ok || !mask_ok {
fail("parity_stencil_clip: failed to resolve prepared buffers")
}
if !write_vertices(backend, foreground_buffer, foreground[:]) ||
!write_vertices(backend, mask_buffer, mask[:]) {
fail("parity_stencil_clip: failed to upload vertices")
}
if !compiler.execute_prepared_planned_frame(&exec, &frame, {0, 0, 0, 1}) {
fail("parity_stencil_clip: failed to execute planned frame")
}
texture, tex_ok := compiler.prepared_texture(&exec, color)
if !tex_ok {
fail("parity_stencil_clip: failed to resolve readback target")
}
rgba := make([]u8, int(WIDTH * HEIGHT * 4))
defer delete(rgba)
if !backend.read_texture_rgba8({texture = texture, width = WIDTH, height = HEIGHT, current_layout = .Shader_Read_Only}, rgba) {
fail("parity_stencil_clip: readback failed")
}
if !write_ppm_rgba8(readback_path, rgba, WIDTH, HEIGHT) {
fail("parity_stencil_clip: failed to write readback")
}
if len(profile_path) > 0 {
_ = gpu.write_profile(profile_path, 0, 1)
}
}