Backdrop scope implementation (#25)
Co-authored-by: Zachary Levy <zachary@sunforge.is> Reviewed-on: #25
This commit was merged in pull request #25.
This commit is contained in:
+90
-63
@@ -97,13 +97,32 @@ gaussian_blur :: proc() {
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// Both panels share rounded corners.
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panel_radii := draw.Rectangle_Radii{16, 16, 16, 16}
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draw.gaussian_blur(
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base_layer,
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{60, 80, 320, 140},
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gaussian_sigma = 30,
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tint = draw.Color{170, 200, 240, 200}, // cool blue, strong mix
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radii = panel_radii,
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)
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// Both zone1 panels share one scope. Different sigmas still trigger separate blur
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// passes (cost scales with unique sigmas, not with backdrop count); the scope just
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// declares "these draws form one bracket." `backdrop_scope` is the RAII-style API:
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// `end_backdrop` fires automatically when the block exits.
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{
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draw.backdrop_scope(base_layer)
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draw.backdrop_blur(
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base_layer,
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{60, 80, 320, 140},
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gaussian_sigma = 30,
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tint = draw.Color{170, 200, 240, 200}, // cool blue, strong mix
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radii = panel_radii,
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)
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// Panel B: lighter blur, warm amber tint. sigma=6.
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draw.backdrop_blur(
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base_layer,
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{420, 80, 320, 140},
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gaussian_sigma = 6,
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tint = draw.Color{255, 220, 160, 200}, // warm amber, strong mix
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radii = panel_radii,
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)
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}
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// Text labels for the two panels. Drawn AFTER `end_backdrop` (which fires at the
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// scope-block exit above), so they composite on top of both panels.
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draw.text(
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base_layer,
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"sigma = 20, cool tint",
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@@ -112,15 +131,6 @@ gaussian_blur :: proc() {
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FONT_SIZE,
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color = draw.Color{30, 35, 50, 255},
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)
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// Panel B: lighter blur, warm amber tint. sigma=6.
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draw.gaussian_blur(
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base_layer,
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{420, 80, 320, 140},
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gaussian_sigma = 6,
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tint = draw.Color{255, 220, 160, 200}, // warm amber, strong mix
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radii = panel_radii,
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)
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draw.text(
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base_layer,
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"sigma = 6, warm tint",
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@@ -130,10 +140,10 @@ gaussian_blur :: proc() {
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color = draw.Color{60, 40, 20, 255},
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)
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// Pass-B verification: a rectangle drawn AFTER the backdrops in the same layer
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// Per the bracket scheduling model, this should render ON TOP of both panels above.
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// If you see this stripe behind the panels instead of in front, something is wrong with
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// the Pass B post-bracket path.
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// Post-bracket verification: a white stripe drawn AFTER `end_backdrop` in the same
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// layer. Should render ON TOP of both panels because the backdrop scope (and its
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// composite output) is now closed; any non-backdrop draw on this layer composites
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// with LOAD on top of whatever the bracket left in source_texture.
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draw.rectangle(base_layer, {WINDOW_W * 0.5 - 4, 70, 8, 160}, draw.Color{255, 255, 255, 230})
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//----- Zone 2: second layer with its own backdrop --------------------------------
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@@ -151,14 +161,18 @@ gaussian_blur :: proc() {
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stripe_y := 320 + (math.sin(t * 0.05) * 0.5 + 0.5) * 200
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draw.rectangle(zone2, {30, stripe_y, WINDOW_W * 0.55 - 60, 18}, draw.Color{255, 100, 200, 200})
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// Zone 2's frosted panel.
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draw.gaussian_blur(
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zone2,
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{60, 360, WINDOW_W * 0.55 - 120, 160},
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gaussian_sigma = 10,
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tint = draw.WHITE, // pure blur (white tint with any alpha is a no-op)
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radii = draw.Rectangle_Radii{24, 24, 24, 24},
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)
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// Zone 2's frosted panel. Single-panel scope; `backdrop_scope` keeps the begin/end
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// pair tied to the block.
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{
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draw.backdrop_scope(zone2)
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draw.backdrop_blur(
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zone2,
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{60, 360, WINDOW_W * 0.55 - 120, 160},
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gaussian_sigma = 10,
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tint = draw.WHITE, // pure blur (white tint with any alpha is a no-op)
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radii = draw.Rectangle_Radii{24, 24, 24, 24},
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)
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}
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draw.text(
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zone2,
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"Layer 2 backdrop",
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@@ -197,15 +211,44 @@ gaussian_blur :: proc() {
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)
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}
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// Edge case 1: sigma = 0 "mirror" — sharp framebuffer sample, no blur. Should reproduce
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// the underlying pixels exactly through the SDF mask. Tinted slightly so it's visible.
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draw.gaussian_blur(
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zone3,
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{WINDOW_W * 0.55 + 30, 310, 150, 70},
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gaussian_sigma = 0,
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tint = draw.WHITE, // pure mirror (no blur, no tint)
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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// All three Zone 3 backdrops share one scope. The sigma=0 mirror, then the two
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// contiguous sigma=8 panels. The sigma=8 pair stays contiguous in the sub-batch list,
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// so `append_or_extend_sub_batch` still coalesces them into a single instanced
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// composite draw — scope boundaries don't affect coalescing, only kind/sigma identity.
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{
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draw.backdrop_scope(zone3)
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// Edge case 1: sigma = 0 "mirror" — sharp framebuffer sample, no blur. Should reproduce
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// the underlying pixels exactly through the SDF mask. Tinted slightly so it's visible.
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draw.backdrop_blur(
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zone3,
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{WINDOW_W * 0.55 + 30, 310, 150, 70},
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gaussian_sigma = 0,
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tint = draw.WHITE, // pure mirror (no blur, no tint)
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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// Edge case 2: two same-sigma panels submitted contiguously. The sub-batch coalescer
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// should merge these into a single instanced V-composite draw. Visually, both should
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// look identical (modulo position) — same blur radius, same tint.
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draw.backdrop_blur(
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zone3,
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{WINDOW_W * 0.55 + 30, 400, 150, 70},
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gaussian_sigma = 8,
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tint = draw.Color{160, 255, 160, 200}, // green tint, strong mix
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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draw.backdrop_blur(
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zone3,
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{WINDOW_W * 0.55 + 200, 400, 150, 70},
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gaussian_sigma = 8,
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tint = draw.Color{160, 255, 160, 200}, // identical: tests sub-batch coalescing
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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}
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// Edge case 3: text drawn AFTER `end_backdrop` in the same layer. Composites on top of
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// the bracket's V-composite output and should appear sharply over the green panels.
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draw.text(
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zone3,
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"sigma=0 (mirror)",
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@@ -214,24 +257,6 @@ gaussian_blur :: proc() {
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FONT_SIZE,
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color = draw.Color{20, 20, 20, 255},
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)
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// Edge case 2: two same-sigma panels submitted contiguously. The sub-batch coalescer
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// should merge these into a single instanced V-composite draw. Visually, both should
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// look identical (modulo position) — same blur radius, same tint.
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draw.gaussian_blur(
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zone3,
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{WINDOW_W * 0.55 + 30, 400, 150, 70},
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gaussian_sigma = 8,
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tint = draw.Color{160, 255, 160, 200}, // green tint, strong mix
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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draw.gaussian_blur(
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zone3,
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{WINDOW_W * 0.55 + 200, 400, 150, 70},
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gaussian_sigma = 8,
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tint = draw.Color{160, 255, 160, 200}, // identical: tests sub-batch coalescing
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radii = draw.Rectangle_Radii{12, 12, 12, 12},
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)
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draw.text(
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zone3,
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"sigma=8 (coalesced pair)",
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@@ -240,12 +265,9 @@ gaussian_blur :: proc() {
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FONT_SIZE,
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color = draw.Color{20, 40, 20, 255},
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)
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// Edge case 3: text drawn AFTER a backdrop in the same layer. Tests Pass B over a fresh
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// V-composite output. The text should appear sharply on top of the green panels above.
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draw.text(
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zone3,
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"Pass B text overlay",
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"Post-scope text overlay",
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{WINDOW_W * 0.55 + 38, 480},
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PLEX_SANS_REGULAR,
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FONT_SIZE,
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@@ -343,18 +365,23 @@ gaussian_blur_debug :: proc() {
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// THE PANEL UNDER TEST. Square, centered, large enough to cover multiple grid cells and
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// the circle row. Square shape makes any horizontal-vs-vertical asymmetry purely
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// renderer-driven (geometry can't introduce it).
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//
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// Uses the explicit begin/end form (instead of `backdrop_scope`) to exercise the
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// alternative API surface in the diagnostic harness.
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panel := draw.Rectangle{250, 150, 300, 300}
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draw.gaussian_blur(
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draw.begin_backdrop(base_layer)
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draw.backdrop_blur(
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base_layer,
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panel,
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gaussian_sigma = sigma,
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tint = draw.WHITE,
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radii = draw.Rectangle_Radii{20, 20, 20, 20},
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)
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draw.end_backdrop(base_layer)
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// Pass B test: a bright rectangle drawn AFTER the backdrop in the same layer. Should
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// always render on top of the panel. If the panel ever shows a "ghost" of this rect
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// inside its blur, the V-composite is sampling the wrong texture state.
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// Post-scope test: a bright rectangle drawn AFTER `end_backdrop` in the same layer.
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// Should always render on top of the panel. If the panel ever shows a "ghost" of this
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// rect inside its blur, the V-composite is sampling the wrong texture state.
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if show_test_rect {
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draw.rectangle(base_layer, {380, 280, 40, 40}, draw.Color{0, 200, 0, 255})
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}
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