gg: sokol fixes and text rendering benchmark

examples/sokol/freetype_raven.v

@@ -0,0 +1,160 @@
+import sokol
+import sokol.sapp
+import sokol.gfx
+import sokol.sgl
+import sokol.sfons
+import os
+import time
+
+
+const (
+text = '
+Once upon a midnight dreary, while I pondered, weak and weary,
+Over many a quaint and curious volume of forgotten lore—
+    While I nodded, nearly napping, suddenly there came a tapping,
+As of some one gently rapping, rapping at my chamber door.
+“’Tis some visitor,” I muttered, “tapping at my chamber door—
+            Only this and nothing more.”
+
+    Ah, distinctly I remember it was in the bleak December;
+And each separate dying ember wrought its ghost upon the floor.
+    Eagerly I wished the morrow;—vainly I had sought to borrow
+    From my books surcease of sorrow—sorrow for the lost Lenore—
+For the rare and radiant maiden whom the angels name Lenore—
+            Nameless here for evermore.
+
+    And the silken, sad, uncertain rustling of each purple curtain
+Thrilled me—filled me with fantastic terrors never felt before;
+    So that now, to still the beating of my heart, I stood repeating
+    “’Tis some visitor entreating entrance at my chamber door—
+Some late visitor entreating entrance at my chamber door;—
+            This it is and nothing more.”
+
+    Presently my soul grew stronger; hesitating then no longer,
+“Sir,” said I, “or Madam, truly your forgiveness I implore;
+    But the fact is I was napping, and so gently you came rapping,
+    And so faintly you came tapping, tapping at my chamber door,
+That I scarce was sure I heard you”—here I opened wide the door;—
+            Darkness there and nothing more.
+
+Deep into that darkness peering, long I stood there wondering, fearing,
+Doubting, dreaming dreams no mortal ever dared to dream before;
+    But the silence was unbroken, and the stillness gave no token,
+    And the only word there spoken was the whispered word, “Lenore?”
+This I whispered, and an echo murmured back the word, “Lenore!”—
+            Merely this and nothing more.
+
+    Back into the chamber turning, all my soul within me burning,
+Soon again I heard a tapping somewhat louder than before.
+    “Surely,” said I, “surely that is something at my window lattice;
+      Let me see, then, what thereat is, and this mystery explore—
+Let my heart be still a moment and this mystery explore;—
+            ’Tis the wind and nothing more!”
+'
+lines = text.split('\n')
+)
+
+struct AppState {
+mut:
+	pass_action C.sg_pass_action
+	fons        &C.FONScontext
+	font_normal int
+	inited bool
+}
+
+fn main() {
+	mut color_action := C.sg_color_attachment_action{
+		action: C.SG_ACTION_CLEAR
+	}
+	color_action.val[0] = 1
+	color_action.val[1] = 1
+	color_action.val[2] = 1
+	color_action.val[3] = 1.0
+	mut pass_action := C.sg_pass_action{}
+	pass_action.colors[0] = color_action
+	state := &AppState{
+		pass_action: pass_action
+		fons: &C.FONScontext(0)
+	}
+	title := 'V Metal/GL Text Rendering'
+	desc := C.sapp_desc{
+		user_data: state
+		init_userdata_cb: init
+		frame_userdata_cb: frame
+		window_title: title.str
+		html5_canvas_name: title.str
+		width: 600
+		height: 700
+		high_dpi: true
+	}
+	sapp.run(&desc)
+}
+
+fn init(user_data voidptr) {
+	mut state := &AppState(user_data)
+	// dont actually alocate this on the heap in real life
+	gfx.setup(&C.sg_desc{
+		mtl_device: sapp.metal_get_device()
+		mtl_renderpass_descriptor_cb: sapp.metal_get_renderpass_descriptor
+		mtl_drawable_cb: sapp.metal_get_drawable
+		d3d11_device: sapp.d3d11_get_device()
+		d3d11_device_context: sapp.d3d11_get_device_context()
+		d3d11_render_target_view_cb: sapp.d3d11_get_render_target_view
+		d3d11_depth_stencil_view_cb: sapp.d3d11_get_depth_stencil_view
+	})
+	s := &C.sgl_desc_t{}
+	C.sgl_setup(s)
+	state.fons = sfons.create(512, 512, 1)
+	// or use DroidSerif-Regular.ttf
+	if bytes := os.read_bytes(os.resource_abs_path('../assets/fonts/RobotoMono-Regular.ttf')) {
+		println('loaded font: $bytes.len')
+		state.font_normal = C.fonsAddFontMem(state.fons, 'sans', bytes.data, bytes.len, false)
+	}
+}
+
+fn frame(user_data voidptr) {
+	t := time.ticks()
+	mut state := &AppState(user_data)
+	state.render_font()
+	gfx.begin_default_pass(&state.pass_action, sapp.width(), sapp.height())
+	sgl.draw()
+	gfx.end_pass()
+	gfx.commit()
+	println(time.ticks()-t)
+}
+
+const (
+
+black = C.sfons_rgba(0, 0, 0, 255)
+)
+
+fn (state &AppState) render_font() {
+	lh := 30
+	mut dy := lh
+	if !state.inited {
+		state.fons.clear_state()
+		sgl.defaults()
+		sgl.matrix_mode_projection()
+		sgl.ortho(0.0, f32(C.sapp_width()), f32(C.sapp_height()), 0.0, -1.0, 1.0)
+		state.fons.set_font(state.font_normal)
+		state.fons.set_size(100.0)
+		C.fonsSetColor(state.fons, black)
+		C.fonsSetFont(state.fons, state.font_normal)
+		C.fonsSetSize(state.fons, 35.0)
+		state.inited = true
+	}
+
+	for line in lines {
+		C.fonsDrawText(state.fons, 40, dy, line.str, C.NULL)
+		dy += lh
+	}
+	C.sfons_flush(state.fons)
+}
+
+fn line(sx f32, sy f32, ex f32, ey f32) {
+	sgl.begin_lines()
+	sgl.c4b(255, 255, 0, 128)
+	sgl.v2f(sx, sy)
+	sgl.v2f(ex, ey)
+	sgl.end()
+}