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refactor(render3d): textures behind gpu.ludic, their sampler state recorded

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Texture creation, 2D and array uploads, pixel packing, filters, wraps, comparison, border,
anisotropy, mipmaps, texture units, read-backs and freeing now go through gpu_tex_* and
gpu_bind_sampler, and no other file names them. Each call is the one GL call it replaces,
in the same order, so OpenGL renders bit-identically at the fixed viewpoints and the game's
self-tests report what they did before.

What those calls say about a texture - size, format, layers, min and mag filter, wraps,
comparison, mipmaps, anisotropy - is recorded per handle as it is set: a backend with
immutable images and separate sampler objects creates both from exactly that.
r3d_bind_tex takes a texture kind (GPU_TEX2D / GPU_TEX2D_ARRAY) instead of a GL target.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 10:29:28 +03:00
parent 43c379aa0f
commit 4d3479d431
10 changed files with 201 additions and 113 deletions
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26
packages/ludic.render3d/sky.ludic
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@ -91,26 +91,26 @@ function sky_precompute() -> void {
gpu_depth_test(false)
if sky_irradiance != 0 {
let ids = gl_scratch()
ids[0] = sky_irradiance; gl_delete_textures(1, ids)
ids[0] = sky_prefilter; gl_delete_textures(1, ids)
ids[0] = sky_brdf; gl_delete_textures(1, ids)
gpu_tex_free(sky_irradiance)
gpu_tex_free(sky_prefilter)
gpu_tex_free(sky_brdf)
}
# irradiance: 128 x 64 equirect
if sky_p_irr == 0 { sky_p_irr = r3d_program("fullscreen.vert", "ibl_irradiance.frag", ""); sky_p_pre = r3d_program("fullscreen.vert", "ibl_prefilter.frag", ""); sky_p_brdf = r3d_program("fullscreen.vert", "ibl_brdf.frag", "") }
let p_irr = sky_p_irr
sky_irradiance = tex_target(128, 64, GL_RGB16F, GL_RGB, GL_FLOAT, GL_LINEAR)
gl_bind_texture(GL_TEXTURE_2D, sky_irradiance)
gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
gpu_tex_bind(GPU_TEX2D, sky_irradiance)
gpu_tex_param(GPU_TEX2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
sky_convolve(p_irr, sky_irradiance, -1, 128, 64, F_ZERO)
# prefiltered specular: 6 roughness levels, 512 x 256 each, as a 2D array
let p_pre = sky_p_pre
sky_prefilter = gl_texture()
gl_bind_texture(GL_TEXTURE_2D_ARRAY, sky_prefilter)
gl_tex_image3d(GL_TEXTURE_2D_ARRAY, 0, GL_RGB16F, 512, 256, SKY_PREFILTER_LEVELS, 0, GL_RGB, GL_FLOAT, null)
gl_tex_parameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT)
gl_tex_parameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
gl_tex_parameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
gl_tex_parameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
sky_prefilter = gpu_tex_new()
gpu_tex_bind(GPU_TEX2D_ARRAY, sky_prefilter)
gpu_tex_image3d(GL_RGB16F, 512, 256, SKY_PREFILTER_LEVELS, GL_RGB, GL_FLOAT, null)
gpu_tex_param(GPU_TEX2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT)
gpu_tex_param(GPU_TEX2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
gpu_tex_param(GPU_TEX2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
gpu_tex_param(GPU_TEX2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
for l in 0 .. SKY_PREFILTER_LEVELS {
sky_convolve(p_pre, sky_prefilter, l, 512, 256, fr(l, SKY_PREFILTER_LEVELS - 1))
}
@ -124,7 +124,7 @@ function sky_precompute() -> void {
# bind the IBL set + sun for a lit program (units 12..14)
function sky_bind_lighting(prog: int) -> void {
r3d_bind_2d(prog, "u_irradiance", 12, sky_irradiance)
r3d_bind_tex(prog, "u_prefilter", 13, GL_TEXTURE_2D_ARRAY, sky_prefilter)
r3d_bind_tex(prog, "u_prefilter", 13, GPU_TEX2D_ARRAY, sky_prefilter)
r3d_bind_2d(prog, "u_brdf", 14, sky_brdf)
u_v3(gpu_uniform(prog, "u_sun_dir"), sun_dir)
u_v3(gpu_uniform(prog, "u_sun_color"), sun_color)