a938c4f900
Phase 8 step 3a of the Metal renderer port:
- New library/modules/gpu/ with types.sx (handles + ClearColor +
TextureFormat enum), api.sx (GPU :: protocol { ... } covering the
lifecycle / per-frame / resource / per-draw surface), and metal.sx
(MetalGPU backend implementing the protocol against CAMetalLayer).
Resource handles are 1-based indices into backend List(*void) tables.
MTL aggregates >16 bytes (MTLRegion, MTLScissorRect) pass via *T to
match arm64 Apple's indirect-by-reference ABI; MTLClearColor + CGSize
go through the HFA path as direct fn-pointer casts on objc_msgSend.
- UIKitPlatform got a gpu_mode: GpuMode toggle + sibling SxMetalView
class registration. In metal mode init skips EAGL context, the
did_finish_launching IMP skips the EAGL drawable-properties dict,
layoutSubviews reads the layer's bounds * dpi_scale into pixel_w/h
instead of allocating a GL renderbuffer, and end_frame is a no-op
(the MetalGPU owns its own present).
- examples/63-metal-clear.sx verifies the pipeline end-to-end on iOS
sim — compiles a pass-through MSL shader (packed_float2/packed_float4
to avoid alignment padding), uploads 3 vertices, draws a colored
triangle on a dark-blue clear.
Compiler fixes (filed-and-fixed in this branch):
- inline if X { return E; } followed by a fall-through final expression
no longer emits two terminators into the same basic block. Verified
by examples/83-inline-if-return-fallthrough.sx.
- Top-level type alias Name :: u32; now resolves correctly as the type
annotation on a global variable (was treated as ptr {}, breaking
comparisons + initializers). Verified by examples/84-global-type-alias.sx.
Issue->feature promotion:
- 16 historical examples/issue-NNNN.sx repros now confirmed-fixed and
renamed to focused feature names (67-82). Each gains a
tests/expected/*.txt + .exit pair so the regression suite covers them.
- 5 stale issue repros deleted (subsumed by broader tests).
Regression suite: 68 passing, 0 failed. macOS chess builds + runs; wasm
chess builds; iOS sim GLES chess still renders the full board; iOS sim
Metal demo renders the triangle.
43 lines
1.9 KiB
Plaintext
43 lines
1.9 KiB
Plaintext
#import "modules/std.sx";
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#import "modules/gpu/types.sx";
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// GPU is the rendering-API abstraction. Concrete backends live as siblings
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// of this file: `metal.sx` (iOS, eventually macOS), `vulkan.sx` (Linux/
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// Android, plus macOS via MoltenVK), `webgpu.sx` (wasm). The SDL-backed
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// GL renderer used by the desktop+wasm path stays as-is until those
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// backends land.
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GPU :: protocol {
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// Bind the GPU to a backend-specific render target (e.g. a
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// CAMetalLayer on iOS). pixel_w/pixel_h are the drawable's pixel
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// dimensions; call resize when they change.
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init :: (target: *void, pixel_w: s32, pixel_h: s32) -> bool;
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shutdown :: ();
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resize :: (pixel_w: s32, pixel_h: s32);
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begin_frame :: (clear: ClearColor) -> bool;
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// target_time is the host clock time at which the drawable should be
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// presented (units match the platform's CADisplayLink.targetTimestamp
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// on Apple). Metal forwards it to presentDrawable:atTime: to cap the
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// pipeline at one frame so the inset slide lands on the same vsync as
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// UIKit's keyboard view. GL backends ignore it.
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end_frame :: (target_time: f64);
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create_shader :: (vsrc: string, fsrc: string) -> ShaderHandle;
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create_buffer :: (size_bytes: s64) -> BufferHandle;
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update_buffer :: (buf: BufferHandle, data: *void, size_bytes: s64);
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create_texture :: (w: s32, h: s32, format: TextureFormat, pixels: *void) -> TextureHandle;
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update_texture_region :: (tex: TextureHandle, x: s32, y: s32, w: s32, h: s32, pixels: *void);
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set_shader :: (sh: ShaderHandle);
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set_vertex_buffer :: (buf: BufferHandle);
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set_texture :: (slot: u32, tex: TextureHandle);
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set_vertex_constants :: (slot: u32, data: *void, size_bytes: s64);
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set_scissor :: (x: s32, y: s32, w: s32, h: s32);
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disable_scissor :: ();
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draw_triangles :: (vertex_offset: s32, vertex_count: s32);
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}
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