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| author | eunhhu <[email protected]> | 2026-09-27 13:02:41 +0100 |
|---|---|---|
| committer | eunhhu <[email protected]> | 2026-09-27 13:02:41 +0100 |
| commit | ba76d3810713bb67569114e9458416df0f78687a (patch) | |
| tree | 357c5285b72626ff7f77d0339ccc0e6d2cc66b7d /Makefile | |
| parent | 2acf27f665f8a926d244efa58f6ef2c92d65e8c4 (diff) | |
| download | vega-ba76d3810713bb67569114e9458416df0f78687a.tar.gz vega-ba76d3810713bb67569114e9458416df0f78687a.zip | |
Draw symbols on the GPU from the point table as it is
OpenGL ES 3.1: the file's points go up as one storage buffer, each symbol
gets 16 row bands listing the curves they reach (cut by integer division of
doubled coordinates, so CPU and shader agree), and every pixel of a symbol's
box sums the exact area of its bands' curves, as vega_coverage does.
vega-symbols gpu draws every symbol against the CPU reference and times
1080p pages.
On the Pi 5's V3D it matches the reference (mean 0.001-0.1 levels, worst
4) but takes 142-757 ms a page, 83% of it in the area function. A sorting
network in registers made it 2.3x faster yet computes wrong rows in the
fragment stage with this driver, while the same code is exact in a compute
shader; so drawing each glyph size once into an atlas by compute comes next.
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -22,8 +22,11 @@ $(BUILD)/vega: $(SOURCES) src/vega.h $(PURE_SOURCES) | $(BUILD) # Building symbol files reads fonts through FreeType; reading them does not. FREETYPE_CFLAGS ?= $(shell pkg-config --cflags freetype2) FREETYPE_LIBS ?= $(shell pkg-config --libs freetype2) -$(BUILD)/vega-symbols: src/symbols-tool.c src/symbols.c src/symbols.h | $(BUILD) - $(CC) $(CPPFLAGS) $(CFLAGS) $(FREETYPE_CFLAGS) src/symbols-tool.c src/symbols.c $(LDFLAGS) $(FREETYPE_LIBS) -lm $(LDLIBS) -o $@ +# Drawing them on the GPU takes OpenGL ES 3.1 through EGL. +GL_LIBS ?= $(shell pkg-config --libs egl glesv2) +$(BUILD)/vega-symbols: src/symbols-tool.c src/symbols.c src/symbols.h src/symbols-gl.c src/symbols-gl.h | $(BUILD) + $(CC) $(CPPFLAGS) $(CFLAGS) $(FREETYPE_CFLAGS) src/symbols-tool.c src/symbols.c src/symbols-gl.c $(LDFLAGS) \ + $(FREETYPE_LIBS) $(GL_LIBS) -lm $(LDLIBS) -o $@ check: $(BUILD)/vega $(BUILD)/vega-symbols $(MAKE) -C $(AUP) build/aup |