* gg: pure-V sgl renderer (gg/render) with CPU rasterizer backend
* gg: add per-corner rounded rect, 9-slice, CPU output equality test
* gg: add multiply/screen blend modes to renderer and CPU rasterizer
* gg: add multiply/screen to ImageEffect enum
* gg: fix review defects in V renderer (font crash, api break, leaks)
- text_rendering: add FonsRenderTarget allocated before
fonsCreateInternal, since fontstash calls renderCreate
synchronously; fixes invalid memory access crash on startup.
renderUpdate now copies only the dirty atlas region.
- draw: rewrite draw_rounded_rect_filled_4 as a single convex
triangle strip (removes nonexistent begin_triangle_fan calls
that broke compilation of any user of the new API, removes
double-blend overlaps); add clamp_radius/clamp_slice helpers.
- draw_9slice: remove dead slices array/loop, clamp dest slices
proportionally, use clamped UVs.
- render: do not create pipeline object 5 (quads reuse triangles
pipeline, matching sgl); push_pipeline uses max_stack_depth-1;
add is_image_registered/update_image_region/destroy.
- image: register textures once per image; streaming updates
refresh the CPU copy via update_image_region.
- gg: call ctx.r.destroy() before gfx.shutdown(); drop unused
gg.render imports; add .vv compile samples for the new APIs.
- flush: pass [4]int dirty rect to validate_texture (was &int,
heap overwrite causing delayed crash in begin()).
* gg: migrate examples off sokol.sgl to ctx.r
gg no longer submits an sgl context after the pure-V renderer migration, so direct sgl calls in gg examples either failed to typecheck (rotating_textured_quad passed render.Pipeline to sgl.load_pipeline) or silently recorded nothing. Route matrix, pipeline, texture and primitive calls through ctx.r instead.
* x.ttf.render_sokol: draw through ctx.r instead of sgl
draw_text_bmp took ctx &gg.Context but issued its matrix, pipeline, texture and quad calls to sokol.sgl. After the pure-V renderer migration gg no longer submits an sgl context, and the mixed types made the function (and every ttf_font example) fail to compile: cannot use render.Pipeline as sgl.Pipeline in argument 1 to sgl.load_pipeline.
* gg: add a compile-test for all gg based examples
Compiles every examples/gg program, plus breakout, viewer and both ttf_font examples, so examples that keep referencing sokol.sgl directly fail the suite instead of the renderer migration (render.Pipeline is not sgl.Pipeline) going unnoticed. The samples are compiled in parallel with VJOBS-style workers into a private vcache directory.
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