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[Feat] (MG_Backend/DirectGLES): support Flywheel indirect rendering

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- Advertise ARB_gpu_shader5 / ARB_multi_bind / ARB_shading_language_420pack /
  ARB_vertex_attrib_binding / ARB_shader_image_size so LWJGL reports
  SUPPORTS_INDIRECT.
- New LowerDrawParametersPass demotes DrawIndex/BaseInstance/BaseVertex
  builtins to Private globals (mg_DrawID/mg_BaseInstance/mg_BaseVertex) for
  the ESSL transpile; SPIRV-Cross otherwise throws for ES profiles. The
  program manager promotes the emitted globals to uniforms and feeds them
  per (sub-)draw.
- Indirect draws now execute natively on the GPU (glDrawElementsIndirect /
  glDrawArraysIndirect per command) when an indirect buffer is bound, so
  compute-written command fields (Flywheel culling updates instanceCount)
  are honored; detects GL_EXT_base_instance and falls back to the CPU loop
  when the command's baseInstance cannot be consumed natively.
- Sync SSBO binding points for graphics draws, not just compute (Flywheel
  vertex shaders read instance data from SSBOs).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
swung0x48
2026-07-08 13:33:05 +00:00
co-authored by Claude Fable 5
parent 9fbb708e64
commit 5ea49f3c50
11 changed files with 417 additions and 63 deletions
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MobileGL/MG_Util/ShaderTranspiler/ShaderCompiler.h
+5
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@@ -22,6 +22,11 @@ namespace MobileGL {
static Result<Vector<Vector<unsigned>>> GetSpirvBinaryFromProgram(const ProgramBinaryAttrib& attrib);
static bool SanitizeAndOptimizeBinary(const Vector<Uint32>& inputBinary,
Vector<uint32_t>& outputBinary);
// Demotes DrawIndex/BaseInstance/BaseVertex builtins to plain Private globals
// (mg_DrawID/mg_BaseInstance/mg_BaseVertex) so SPIRV-Cross can emit ESSL.
// Only for backends without native draw-parameter support (DirectGLES).
static bool LowerDrawParametersForEssl(const Vector<Uint32>& inputBinary,
Vector<uint32_t>& outputBinary);
static Result<String> DecompileShader(SpvcSession& session);
};
} // namespace ShaderTranspiler