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feat(render3d): gpu.ludic - the seam for a second graphics API, and what the GPU can do

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Render state (depth, blending, culling, colour writes, alpha-to-coverage, depth bias,
scissor) and uniforms go through gpu_* / u_* and nowhere else; OpenGL state is cached and
only changes reach the driver. Frames are bit-identical to before at the fixed viewpoints.
R3D_GFX=gl|vk or gpu_request chooses a backend, falling back to OpenGL with a reason.

gpu_caps_probe() asks Vulkan, on Windows, for the 1.3 floor, ray tracing, mesh shaders, the
NVIDIA RTX generation, Reflex and HDR colour spaces, for a game's settings to grey out what
a machine cannot use; R3D_CAPS pretends to be a given card for tests.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 09:52:12 +03:00
parent 208cad7ca1
commit 54eeef5f8d
17 changed files with 652 additions and 312 deletions
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9
packages/ludic.render3d/fmath.ludic
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@ -196,11 +196,4 @@ function m4_xform_point(o: words, m: words, x: int, y: int, z: int) -> int {
return f_add(f_add(f_mul(m[3], x), f_mul(m[7], y)), f_add(f_mul(m[11], z), m[15]))
}
# ---- uniforms ------------------------------------------------------------------
function u_mat4(loc: int, m: words) -> void { gl_uniform_matrix4fv(loc, 1, 0, m) }
function u_f(loc: int, v: int) -> void { let t = gl_scratch(); t[0] = v; gl_uniform1fv(loc, 1, t) }
function u_f2(loc: int, x: int, y: int) -> void { let t = gl_scratch(); t[0] = x; t[1] = y; gl_uniform2fv(loc, 1, t) }
function u_f3(loc: int, x: int, y: int, z: int) -> void { let t = gl_scratch(); t[0] = x; t[1] = y; t[2] = z; gl_uniform3fv(loc, 1, t) }
function u_f4(loc: int, x: int, y: int, z: int, w: int) -> void { let t = gl_scratch(); t[0] = x; t[1] = y; t[2] = z; t[3] = w; gl_uniform4fv(loc, 1, t) }
function u_v3(loc: int, v: words) -> void { gl_uniform3fv(loc, 1, v) }
function u_i(loc: int, v: int) -> void { gl_uniform1i(loc, v) }
# ---- uniforms: see gpu.ludic (gpu_uniform and the u_* setters) ----