[gg] Add texture filtering controls for pixel-perfect rendering

[ejstembler]

Feature Request: Texture Filtering Controls in gg Module

Problem

The gg graphics module currently doesn't expose texture filtering controls, making it difficult to achieve pixel-perfect rendering for pixel art games. When scaling images using draw_image_part(), the graphics
backend applies linear filtering by default, causing blurriness and anti-aliasing artifacts that are undesirable for pixel art.

Current Behavior

// This scales a 16x16 tile to 32x32 but results in blurry/filtered output
dst_rect := gg.Rect{x, y, 32.0, 32.0}
src_rect := gg.Rect{src_x, src_y, 16.0, 16.0}
ctx.draw_image_part(dst_rect, src_rect, &img)

Even with sample_count: 1 to disable anti-aliasing, the texture filtering still causes blurriness when scaling images.

Desired Behavior

Add texture filtering options to either:

1. gg.Config for global texture filtering:

gg.new_context(
    sample_count: 1
    texture_filter: .nearest  // or .linear (default)
)

2. Per-image filtering when creating images:

img := ctx.create_image_with_filter(path, .nearest) or { panic(err) }

3. Per-draw-call filtering:

ctx.draw_image_part_filtered(dst_rect, src_rect, &img, .nearest)

Workarounds Attempted

• Setting sample_count: 1 (helps with anti-aliasing but not texture filtering)
• Manual pixel-by-pixel rendering (performance issues and complexity)
• Integer-only coordinates (doesn't solve the core filtering issue)

Similar APIs

• OpenGL: glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
• SDL: SDL_SetTextureScaleMode(texture, SDL_ScaleModeNearest)
• Raylib: SetTextureFilter(texture, TEXTURE_FILTER_POINT)

Would it be possible to expose the underlying graphics backend's texture filtering controls through the gg module?

Use Case

This is essential for:

• Pixel art games and applications
• Retro-style graphics that need crisp, unfiltered scaling
• Any application requiring precise pixel control

Version used

0.4.11 e3b07d9

Environment details (OS name and version, etc.)

macOS 15.5 (24F74)

[huly-for-github]

Connected to Huly®: V_0.6-23403

[spytheman]

Can you please make a small but complete example, that can be run directly, that demonstrates the problem?

[Larsimusrex]

You can use streaming images for this gg.new_streaming_image(256, 256, 4, gg.StreamingImageConfig{pixel_format: .rgba8, min_filter: .nearest, mag_filter: .nearest})