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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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24
packages/ludic.render3d/overlay.ludic
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@ -159,12 +159,12 @@ function ov_begin() -> void {
if not ov_ready { return }
gl_bind_framebuffer(GL_FRAMEBUFFER, gl_screen_fbo())
gl_viewport(0, 0, gl_w, gl_h)
gl_disable(GL_DEPTH_TEST)
gl_disable(GL_CULL_FACE)
gl_enable(GL_BLEND)
gl_blend_func(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
gpu_depth_test(false)
gpu_cull(false)
gpu_blend(true)
gpu_blend_func(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
gl_use_program(ov_prog)
u_f2(gl_uniform(ov_prog, "u_screen"), fi(gl_w), fi(gl_h))
u_f2(gpu_uniform(ov_prog, "u_screen"), fi(gl_w), fi(gl_h))
ov_n = 0; ov_nr = 0; ov_range_start = 0
ov_tex = ov_white
ov_clip_w = 0
@ -204,24 +204,24 @@ function ov_flush() -> void {
r3d_bind_2d(ov_prog, "u_tex", 0, t)
var is_font = F_ZERO
if t == ov_font { is_font = F_ONE }
u_f(gl_uniform(ov_prog, "u_is_font"), is_font)
u_f(gpu_uniform(ov_prog, "u_is_font"), is_font)
last = t
}
if ov_ranges[o + 5] > 0 {
if not clipped { gl_enable(GL_SCISSOR_TEST); clipped = true }
gl_scissor(ov_ranges[o + 3], gl_h - ov_ranges[o + 4] - ov_ranges[o + 6], ov_ranges[o + 5], ov_ranges[o + 6])
} else if clipped { gl_disable(GL_SCISSOR_TEST); clipped = false }
clipped = true
gpu_scissor(ov_ranges[o + 3], ov_ranges[o + 4], ov_ranges[o + 5], ov_ranges[o + 6])
} else if clipped { gpu_scissor_off(); clipped = false }
gl_draw_arrays(GL_TRIANGLES, ov_ranges[o + 1] * 6, ov_ranges[o + 2] * 6)
}
if clipped { gl_disable(GL_SCISSOR_TEST) }
if clipped { gpu_scissor_off() }
gl_bind_vertex_array(0)
ov_n = 0; ov_nr = 0; ov_range_start = 0
}
function ov_end() -> void {
if not ov_open { return }
ov_flush()
gl_disable(GL_BLEND)
gl_enable(GL_DEPTH_TEST)
gpu_blend(false)
gpu_depth_test(true)
ov_open = false
}
function ov_use_tex(t: int) -> void {