[Vulkan] Add spirv_disable_rounding_mode_rte

RenderDoc's shader debugger doesn't support RoundingModeRTE and crashes.

Co-Authored-By: Herman S. <429230+has207@users.noreply.github.com>

src/xenia/gpu/spirv_shader_translator.cc

@@ -15,12 +15,20 @@
 #include "third_party/fmt/include/fmt/format.h"
 #include "third_party/glslang/SPIRV/GLSL.std.450.h"
 #include "xenia/base/assert.h"
+#include "xenia/base/cvar.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/math.h"
 #include "xenia/base/string_buffer.h"
 #include "xenia/gpu/spirv_compatibility.h"
 #include "xenia/gpu/spirv_shader.h"
 
+DEFINE_bool(
+    spirv_disable_rounding_mode_rte, false,
+    "Disable RoundingModeRTE capability in SPIR-V shaders. Enable this to "
+    "allow shader debugging in RenderDoc, which doesn't support this "
+    "capability.",
+    "GPU");
+
 namespace xe {
 namespace gpu {
 
@@ -833,7 +841,8 @@ std::vector<uint8_t> SpirvShaderTranslator::CompleteTranslation() {
     builder_->addExecutionMode(function_main_,
                                spv::ExecutionModeSignedZeroInfNanPreserve, 32);
   }
-  if (features_.rounding_mode_rte_float32) {
+  if (features_.rounding_mode_rte_float32 &&
+      !cvars::spirv_disable_rounding_mode_rte) {
     builder_->addCapability(spv::CapabilityRoundingModeRTE);
     builder_->addExecutionMode(function_main_,
                                spv::ExecutionModeRoundingModeRTE, 32);

src/xenia/gpu/vulkan/vulkan_pipeline_cache.cc

@@ -59,6 +59,9 @@ DEFINE_int32(
     "the number of threads explicitly (up to the number of logical CPU cores), "
     "0 to disable multithreaded pipeline creation.",
     "Vulkan");
+
+DECLARE_bool(spirv_disable_rounding_mode_rte);
+
 namespace xe {
 namespace gpu {
 namespace vulkan {
@@ -88,11 +91,11 @@ bool VulkanPipelineCache::Initialize() {
   signed_zero_inf_nan_preserve_float32_ =
       features.signed_zero_inf_nan_preserve_float32;
   denorm_flush_to_zero_float32_ = features.denorm_flush_to_zero_float32;
-  rounding_mode_rte_float32_ = features.rounding_mode_rte_float32;
+  rounding_mode_rte_float32_ = features.rounding_mode_rte_float32 &&
+                               !cvars::spirv_disable_rounding_mode_rte;
 
   shader_translator_ = std::make_unique<SpirvShaderTranslator>(
-      features,
-      render_target_cache_.msaa_2x_attachments_supported(),
+      features, render_target_cache_.msaa_2x_attachments_supported(),
       render_target_cache_.msaa_2x_no_attachments_supported(),
       edram_fragment_shader_interlock,
       render_target_cache_.draw_resolution_scale_x(),