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gpu: Gles3Gpu — GLES3 implementation of the GPU protocol

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Mirror of metal.sx, talks to GLES3 via opengl.sx's runtime-loaded
fn-pointer variables. EGL bootstrap is owned by AndroidPlatform; this
module just calls `load_gl(@eglGetProcAddress)` once during `init` to
populate the pointers, then drives raw draw/state from there.

The renderer's vertex layout (12 floats: pos2/uv2/color4/params4 = 48
bytes, attribute locations 0-3) is hardcoded in a single shared VAO
the Gles3Gpu owns — `set_vertex_buffer` rebinds the active VBO against
it. `set_vertex_constants(slot=1, data, 64)` is treated as the 4x4
projection matrix; `set_texture(slot=0, ...)` binds texture unit 0 and
sets `uniform sampler2D uTex` — both match renderer.sx's shader
contract.

A subtle gotcha caught + recorded in the file header: declaring the
same GL name as a `#foreign` function while opengl.sx also declares it
as an fn-pointer global silently lets the global win, and calling
through the uninitialized variable jumps to PC=0. Solution: don't
re-declare; use opengl.sx's pointers and `load_gl` them.

renderer.sx: the GPU-protocol shader-source branch now passes
(UI_VERT_SRC_ES, UI_FRAG_SRC_ES) on Android (separate vert+frag) vs.
the combined MSL library on iOS. Both gated with `inline if OS == X`.
This commit is contained in:
agra
2026-05-19 09:32:09 +03:00
parent d8968ae093
commit 5c41e9c180
2 changed files with 341 additions and 1 deletions
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10
library/modules/ui/renderer.sx
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@@ -62,7 +62,15 @@ UIRenderer :: struct {
// draw reads from its own slice and can outlive earlier in-
// flight draws without corruption.
metal_buf_size := buf_size * 4;
self.mtl_shader = self.gpu.create_shader(UI_MSL_SRC, "");
// Backend-specific shader sources: Metal takes a combined MSL
// library with `vmain` + `fmain` entry points; GLES3 takes a
// separate vertex / fragment pair. Caller selects via OS gate.
inline if OS == .android {
self.mtl_shader = self.gpu.create_shader(UI_VERT_SRC_ES, UI_FRAG_SRC_ES);
}
inline if OS == .ios {
self.mtl_shader = self.gpu.create_shader(UI_MSL_SRC, "");
}
self.mtl_vbuf = self.gpu.create_buffer(metal_buf_size);
self.mtl_buf_capacity = metal_buf_size;
white_px : [4]u8 = .[255, 255, 255, 255];