Initial project import

tools/v/examples/sokol/08_sdf/sdf.v

@@ -0,0 +1,70 @@
+// A Signed Distance Field rendering demo, ported from https://github.com/floooh/sokol-samples/blob/master/sapp/sdf-sapp.c
+// which in turn is based on https://iquilezles.org/articles/mandelbulb/ and https://www.shadertoy.com/view/ltfSWn
+// vtest build: misc-tooling // needs .h files that are produced by `v shader`
+import sokol.sapp
+import sokol.gfx
+
+#include "@VMODROOT/sdf.h" # It should be generated with `v shader .`
+
+fn C.sdf_shader_desc(gfx.Backend) &gfx.ShaderDesc
+
+@[packed]
+struct C.vs_params_t {
+mut:
+	aspect f32
+	time   f32
+}
+
+struct State {
+mut:
+	pip     gfx.Pipeline
+	bind    gfx.Bindings
+	paction gfx.PassAction
+	params  C.vs_params_t
+}
+
+fn init(mut state State) {
+	gfx.setup(sapp.create_desc())
+
+	fsq_verts := [f32(-1.0), -3.0, 3.0, 1.0, -1.0, 1.0]!
+	state.bind.vertex_buffers[0] = gfx.make_buffer(gfx.BufferDesc{
+		label: c'fsq vertices'
+		data:  gfx.Range{&fsq_verts[0], sizeof(fsq_verts)}
+	})
+
+	mut pipeline := gfx.PipelineDesc{}
+	pipeline.layout.attrs[C.ATTR_vs_position].format = .float2
+	pipeline.shader = gfx.make_shader(voidptr(C.sdf_shader_desc(gfx.query_backend())))
+	state.pip = gfx.make_pipeline(&pipeline)
+
+	// No need to clear the window, since the shader will overwrite the whole framebuffer
+	state.paction.colors[0].load_action = .dontcare
+}
+
+fn frame(mut state State) {
+	w, h := sapp.width(), sapp.height()
+	state.params.time += f32(sapp.frame_duration())
+	state.params.aspect = f32(w) / f32(h)
+	gfx.begin_pass(sapp.create_default_pass(state.paction))
+	gfx.apply_pipeline(state.pip)
+	gfx.apply_bindings(state.bind)
+	gfx.apply_uniforms(.vs, C.SLOT_vs_params, gfx.Range{&state.params, sizeof(state.params)})
+	gfx.draw(0, 3, 1)
+	gfx.end_pass()
+	gfx.commit()
+}
+
+fn main() {
+	sapp.run(sapp.Desc{
+		window_title:      c'SDF Rendering'
+		width:             512
+		height:            512
+		frame_userdata_cb: frame
+		init_userdata_cb:  init
+		cleanup_cb:        gfx.shutdown
+		icon:              sapp.IconDesc{
+			sokol_default: true
+		}
+		user_data:         &State{}
+	})
+}