From a8e28405f9bd56924b494012166212189c8948aa Mon Sep 17 00:00:00 2001
From: mchughalex <25671999+mchughalex@users.noreply.github.com>
Date: Fri, 17 Jul 2026 12:06:47 +0100
Subject: [PATCH] render: float color formats in nrhi (RGBA16F + R11G11B10F)

---
 include/rex/graphics/native_rhi.h         | 6 ++++++
 src/graphics/d3d12/native_rhi_d3d12.cpp   | 4 ++++
 src/graphics/vulkan/native_rhi_vulkan.cpp | 9 +++++++++
 3 files changed, 19 insertions(+)

diff --git a/include/rex/graphics/native_rhi.h b/include/rex/graphics/native_rhi.h
index ef04b42..aa51542 100644
--- a/include/rex/graphics/native_rhi.h
+++ b/include/rex/graphics/native_rhi.h
@@ -59,6 +59,12 @@ enum class Format : uint32_t {
   kBC3_UNORM,
   kBC4_UNORM,
   kBC5_UNORM,
+  // Float color formats (HDR render targets), appended so existing values
+  // stay stable across exe/dll pairs. Both are color-renderable and
+  // blendable on every target backend (D3D12 FL11+, Vulkan core, MoltenVK);
+  // kR11G11B10_FLOAT has no alpha channel and stores no sign bits.
+  kR16G16B16A16_FLOAT,
+  kR11G11B10_FLOAT,
 };
 
 // Block dimensions/bytes for the copy math (1x1 for uncompressed).
diff --git a/src/graphics/d3d12/native_rhi_d3d12.cpp b/src/graphics/d3d12/native_rhi_d3d12.cpp
index 673ebc1..7a6e327 100644
--- a/src/graphics/d3d12/native_rhi_d3d12.cpp
+++ b/src/graphics/d3d12/native_rhi_d3d12.cpp
@@ -45,6 +45,10 @@ DXGI_FORMAT ToDxgi(Format format) {
       return DXGI_FORMAT_R16G16_UNORM;
     case Format::kR10G10B10A2_UNORM:
       return DXGI_FORMAT_R10G10B10A2_UNORM;
+    case Format::kR16G16B16A16_FLOAT:
+      return DXGI_FORMAT_R16G16B16A16_FLOAT;
+    case Format::kR11G11B10_FLOAT:
+      return DXGI_FORMAT_R11G11B10_FLOAT;
     case Format::kR32_FLOAT:
       return DXGI_FORMAT_R32_FLOAT;
     case Format::kR32G32_FLOAT:
diff --git a/src/graphics/vulkan/native_rhi_vulkan.cpp b/src/graphics/vulkan/native_rhi_vulkan.cpp
index 8d92d27..105bc06 100644
--- a/src/graphics/vulkan/native_rhi_vulkan.cpp
+++ b/src/graphics/vulkan/native_rhi_vulkan.cpp
@@ -76,6 +76,12 @@ VkFormat ToVkFormat(Format format) {
     case Format::kR10G10B10A2_UNORM:
       // Identical bit layout to DXGI_FORMAT_R10G10B10A2_UNORM.
       return VK_FORMAT_A2B10G10R10_UNORM_PACK32;
+    case Format::kR16G16B16A16_FLOAT:
+      return VK_FORMAT_R16G16B16A16_SFLOAT;
+    case Format::kR11G11B10_FLOAT:
+      // Identical bit layout to DXGI_FORMAT_R11G11B10_FLOAT (R in the low
+      // bits of the packed 32).
+      return VK_FORMAT_B10G11R11_UFLOAT_PACK32;
     case Format::kR32_FLOAT:
       return VK_FORMAT_R32_SFLOAT;
     case Format::kR32G32_FLOAT:
@@ -123,6 +129,9 @@ uint32_t FormatBytesPerBlock(Format format) {
     case Format::kR32_FLOAT:
     case Format::kD32_FLOAT:
       return 4;
+    case Format::kR11G11B10_FLOAT:
+      return 4;
+    case Format::kR16G16B16A16_FLOAT:
     case Format::kR32G32_FLOAT:
       return 8;
     case Format::kR32G32B32_FLOAT: