graphics: hoist loop-invariant checks out of draw/attrib hot paths (#807)

* graphics: hoist loop-invariant checks out of draw/attrib hot paths

DrawIndirectMulti recomputed the index_type_and_size switch on every
sub-draw of a multi-draw-indirect call, and ShaderApplyAttribSemantics
re-checked the debug-dump config flag on every vertex attribute. Both
values are invariant across their respective loops, so compute them
once before iterating instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* graphics: cache vertex buffer descriptor size in AcquireVertexBuffers

VertexBufferDescriptorSize was computed twice per vertex-buffer slot
on every draw call: once while collecting guest ranges, and again
while rebuilding slot bindings. Both calls use identical inputs, so
cache the first pass's result and reuse it in the second.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

src/graphics/shader/shader.cpp

@@ -388,6 +388,8 @@ static void ShaderApplyAttribSemantics(ShaderVertexInputInfo& info,
 
 	EXIT_IF(attrib == nullptr || buffer == nullptr);
 
+	const bool debug_dump = Config::GraphicsDebugDumpEnabled();
+
 	for (uint32_t i = 0; i < num_input_semantics; i++) {
 		const auto& in = input_semantics[i];
 
@@ -396,7 +398,7 @@ static void ShaderApplyAttribSemantics(ShaderVertexInputInfo& info,
 		uint32_t reg  = in.hardware_mapping;
 		uint32_t size = in.size_in_elements;
 
-		if (Config::GraphicsDebugDumpEnabled()) {
+		if (debug_dump) {
 			LOGF("reg = %u, size = %u, va[%u] = 0x%08" PRIx32 "\n", reg, size, i,
 			     attrib[in.semantic]);
 		}