Rust OpenGL Rendering Engine

Distinguish retained-mode UI construction, display-list generation, and immediate GPU command submission in the planned engine.

Connect to the X server, verify GLX support, and choose a framebuffer configuration with double-buffered, sRGB-capable color and stencil support.

Create an X11 colormap and window from the selected GLX visual, with the event masks and window-manager protocols required by the engine.

Create and activate an OpenGL 4.5 Core context for an X11 window through GLX.

Encapsulate X11 and GLX handles behind Rust RAII types with explicit ownership and unsafe FFI boundaries.

Load OpenGL entry points at runtime and validate required version, extensions, and resource limits.

Enable OpenGL debug output and translate driver messages into actionable Rust diagnostics.

Run a frame loop that drains X11 events, clears the framebuffer, swaps buffers, and shuts down cleanly.

Trace vertex data through vertex processing, primitive assembly, rasterization, fragment processing, blending, and framebuffer storage.

Convert positions among local, parent, window-pixel, normalized-device, and framebuffer coordinate spaces.

Represent translation, scale, rotation, and shear as homogeneous 2D transformation matrices.

Compose and invert affine transformations in the correct order for nested visual elements.

Compile and link GLSL vertex and fragment shaders while reporting source-level errors.

Render indexed geometry using vertex arrays, vertex buffers, and element buffers.

Construct an orthographic projection that maps Linux window pixels to OpenGL clip space.

Handle X11 window resizing and framebuffer viewport changes without distorting pixel-space geometry.

Convert between straight-alpha and premultiplied-alpha color representations without introducing edge artifacts.

Derive linear-light source-over compositing and configure OpenGL blending for premultiplied-alpha output.

Configure sRGB framebuffer conversion and texture formats so color decoding, blending, and encoding occur in the appropriate spaces.

Generate vertex and index data for filled axis-aligned and transformed rectangles.

Render configurable rectangular borders without double-blending shared edges.

Render rounded rectangles using an analytic fragment-shader coverage calculation.

Represent line, quadratic Bézier, and cubic Bézier segments in a reusable path structure and flatten curves to a screen-space error tolerance.

Tessellate simple, non-self-intersecting flattened contours into indexed fill geometry while explicitly rejecting unsupported path cases.

Convert styled shape operations into a typed, order-preserving draw-command stream.

Preserve painter’s-order semantics while grouping compatible commands into render batches.

Render large sets of rectangles through instanced drawing with per-instance attributes.

Stream dynamic geometry through persistently mapped buffers using fences to avoid overwriting in-flight data.

Implement rectangular clipping with scissor rectangles after converting UI coordinates to framebuffer coordinates.

Implement nested non-rectangular clipping with incrementing and decrementing stencil operations.

Create and validate offscreen framebuffer objects with color and stencil attachments.

Composite an offscreen render target back into its parent while preserving opacity and clipping semantics.

Design a Rust element API that provides object-oriented polymorphism through traits while keeping render data type-safe.

Store elements in an arena with stable identifiers so parent, child, focus, and event references remain valid.

Implement tree mutation operations that preserve parent-child ownership and prevent structural cycles.

Represent the engine’s dimensions, spacing, flow, alignment, positioning, colors, borders, opacity, transforms, visibility, overflow, text, and image properties as typed style values.

Resolve assigned style values into concrete computed values needed by layout and painting.

Propagate layout, paint, transform, and subtree dirty flags after targeted tree or style mutations.

Derive deterministic paint order from tree order, positioning, visibility, and stacking metadata.

Traverse the retained tree to emit draw commands without exposing GPU details to element objects.

Resolve content, padding, border, and margin boxes from typed style values.

Expose intrinsic-size queries that later text and image elements can implement.

Propagate available-size constraints from a parent box to its children.

Lay out normal-flow children vertically while accounting for spacing and explicit dimensions.

Lay out row and column containers with main-axis distribution and cross-axis alignment.

Resolve percentage, automatic, minimum, and maximum dimensions without circular dependencies.

Position absolute children relative to the correct containing block.

Recompute only layout branches affected by a size or style change while preserving valid cached geometry.

Decode X11 pointer, button, wheel, focus, expose, configure, and close notifications into engine-owned event types.

Translate pointer coordinates through viewport, scroll, and inverse element transforms into local coordinates.

Hit-test visible elements in reverse paint order while respecting rounded geometry and active clips.

Dispatch events through capture, target, and bubble phases along a stable ancestor path.

Register and remove typed event listeners without violating Rust aliasing or mutating the tree during active dispatch.

Track hover, pressed, and pointer-capture state across pointer motion and element removal.

Normalize X11 key press, release, and repeat information through XKB and route keyboard events through an explicitly managed focus path.

Schedule layout and repaint work after event callbacks without busy-spinning the X11 event loop.

Parse the PNG signature and chunk stream while checking lengths, ordering constraints, and CRC-32 values.

Interpret IHDR metadata and collect IDAT payloads for supported non-interlaced 8-bit truecolor and RGBA images.

Parse and validate the zlib wrapper fields while retaining the expected Adler-32 value for post-decompression verification.

Read LSB-first DEFLATE bits across byte boundaries and decode stored blocks with valid LEN and NLEN fields.

Construct canonical Huffman decode tables with DEFLATE’s bit ordering and decode fixed-Huffman blocks.

Decode dynamic Huffman descriptions, including repeated code lengths and invalid or incomplete trees.

Expand literals and bounded overlapping LZ77 back-references, then verify the decompressed stream’s Adler-32 checksum.

Reverse PNG scanline filters and reconstruct decoded pixels in a consistent straight-alpha RGBA representation.

Parse an sfnt table directory and safely bounds-check access to required TrueType tables.

Map basic Latin code points to glyph identifiers through a TrueType cmap format 4 subtable.

Read global font units, ascender, descender, line-gap, glyph-count, and horizontal-advance metrics.

Locate glyph records through short and long loca formats and decode simple glyf contours.

Decode compound glyph component transforms with explicit recursion, cycle, and size limits.

Convert TrueType on-curve and off-curve points into explicit quadratic Bézier segments.

Rasterize an unhinted, flattened glyph outline into an anti-aliased coverage bitmap using winding-aware scan conversion.

Read legacy kern format 0 pairs and combine them with glyph advances to position a basic Latin glyph run.

Pack rasterized glyph bitmaps into one or more texture atlases with stable cache entries.

Upload glyph coverage and shade text with correct premultiplied-alpha edge blending.

Measure a validated basic-Latin Rust string from glyph advances, kerning pairs, and font scale.

Break basic Latin text into width-constrained lines at supported whitespace boundaries.

Place text lines from baseline, ascent, descent, line-gap, and alignment properties.

Upload decoded PNG pixels with correct row orientation, sRGB interpretation, and linear-space premultiplication before blending.

Compute contain, cover, stretch, and alignment geometry for an image inside its content box.

Feed text and image intrinsic measurements back into box layout and trigger bounded reflow when resources become available.

Compute scroll extents from laid-out content and clamp element scroll offsets after geometry changes.

Apply wheel input to the nearest eligible scroll container and propagate unused scroll delta to ancestors.

Combine scroll transforms with overflow clips during hit-testing and painting.

Promote opacity, transformed, or cached subtrees into offscreen compositing layers without changing visual order.

Cache a subtree’s draw commands and invalidate the cache only when its paint-relevant inputs change.

Track conservative damage rectangles for changed, moved, revealed, and removed visuals.

Rerasterize only damaged regions in a persistent backing target, then present a complete frame without assuming GLX back-buffer contents survive a swap.

Retire textures, buffers, framebuffers, glyphs, and cached layers only after both CPU references and GPU use have ended.

Measure CPU time for event processing, layout, command generation, batching, and submission with per-frame traces.

Measure GPU pass duration with asynchronous timer queries without stalling the render loop.

Diagnose synchronization bubbles, excessive state changes, overdraw, and batch fragmentation from captured metrics.

Build stress scenes that independently exercise deep trees, dense geometry, text atlases, images, clipping, and scrolling.

Add visual debugging overlays for bounds, clips, damage, layer promotion, hit targets, and repaint counts.

Test PNG, DEFLATE, and TrueType parsers against malformed and adversarial inputs without panics, unbounded work, or out-of-bounds access.

Compare offscreen rendering results with golden images using tolerance-aware pixel differences.

Assemble a public Rust API and demonstration application that constructs styled nested elements, renders text and PNG images, scrolls content, and responds to keyboard and mouse input.