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[Feat, Test] (MG_Backend/DirectVulkan, MG_Test, MG_IntegrationTest): rasterize the viewport gl_ViewportIndex selects, instead of collapsing all sixteen onto viewport 0

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swung0x48
2026-08-13 04:44:23 -04:00
parent 5fbb17f6b9
commit f41403e227
10 changed files with 947 additions and 13 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.h
+15
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@@ -151,6 +151,12 @@ namespace MobileGL::MG_Backend::DirectVulkan {
// PROGRAM rather than of the variant: the zeroed variant leaves the variable
// declared, so both variants answer the same and the draw path can ask either.
Bool readsBaseVertexBuiltin = false;
// Some pre-rasterization stage assigns gl_ViewportIndex. Its pipeline declares
// viewportCount = the renderer's rasterizable viewport count instead of 1, and its
// draws push the whole viewport/scissor array; every other program keeps the
// single-viewport fast path untouched. Part of the program's identity (folded into
// the pipeline hash through programHash), so no memo can serve the wrong shape.
Bool writesViewportIndexBuiltin = false;
// This program has a tessellation EVALUATION stage and no tessellation CONTROL
// stage. GL allows that (4.6 core 11.2.2: with no control shader the input patch
// is passed through unmodified, the output patch size is PATCH_VERTICES, and the
@@ -400,6 +406,12 @@ namespace MobileGL::MG_Backend::DirectVulkan {
// Shared by the two above: does any entry point list an input variable decorated with
// this builtin?
static Bool ReflectedDeclaresInputBuiltin(const SpvReflectShaderModule& reflectModule, SpvBuiltIn builtin);
// True when an entry point writes the ViewportIndex builtin (gl_ViewportIndex), i.e. when
// the program can route primitives to a viewport other than 0 and its pipeline therefore
// has to declare more than one. Asks about OUTPUT variables because that is the direction
// a pre-rasterization stage declares it in.
static Bool ReflectedWritesViewportIndexBuiltin(const SpvReflectShaderModule& reflectModule);
static Bool ReflectedDeclaresOutputBuiltin(const SpvReflectShaderModule& reflectModule, SpvBuiltIn builtin);
// The pass-through tessellation control stage GL 4.6 core 11.2.2 describes for a
// program that has an evaluation stage and no control stage, for an input patch of
@@ -434,6 +446,9 @@ namespace MobileGL::MG_Backend::DirectVulkan {
void ReflectVertexInputs(const Vector<SharedPtr<MG_State::GLState::ShaderObject>>& shaders,
const Vector<Vector<Uint>>& spirv,
VkProgramObject& entry) const;
void ReflectViewportIndexUsage(const Vector<SharedPtr<MG_State::GLState::ShaderObject>>& shaders,
const Vector<Vector<Uint>>& spirv,
VkProgramObject& entry) const;
void ReflectFragmentOutputs(const Vector<SharedPtr<MG_State::GLState::ShaderObject>>& shaders,
const Vector<Vector<Uint>>& spirv,
VkProgramObject& entry) const;