Adds floating point textures to backends

R8G8B8A8_UNORM isn't enough to store HDR data as the scene can brighter
than 1.0 especially when looking into sun speculars.

source/renderer/backend/Format.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2024 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -56,6 +56,8 @@ enum class Format
 	R32G32B32_SFLOAT,
 	R32G32B32A32_SFLOAT,
 
+	B10G11R11_UFLOAT,
+
 	D16_UNORM,
 	D24_UNORM,
 	D24_UNORM_S8_UINT,

source/renderer/backend/gl/Device.cpp

@@ -943,7 +943,6 @@ bool CDevice::IsTextureFormatSupported(const Format format) const
 	case Format::R32_SFLOAT:
 	case Format::R32G32_SFLOAT:
 	case Format::R32G32B32_SFLOAT:
-	case Format::R32G32B32A32_SFLOAT:
 		break;
 
 	case Format::D16_UNORM:
@@ -967,6 +966,11 @@ bool CDevice::IsTextureFormatSupported(const Format format) const
 		supported = m_Capabilities.S3TC;
 		break;
 
+	case Format::R16G16B16A16_SFLOAT:
+	case Format::R32G32B32A32_SFLOAT:
+		supported = m_Capabilities.computeShaders && m_Capabilities.storage && ogl_HaveExtension("GL_ARB_texture_float");
+		break;
+
 	default:
 		break;
 	}
@@ -984,6 +988,10 @@ bool CDevice::IsFramebufferFormatSupported(const Format format) const
 	case Format::R8_UNORM:
 		supported = ogl_HaveVersion(3, 0);
 		break;
+	case Format::R16G16B16A16_SFLOAT:
+	case Format::R32G32B32A32_SFLOAT:
+		supported = m_Capabilities.computeShaders && m_Capabilities.storage && GLAD_GL_ARB_texture_float;
+		break;
 #endif
 	case Format::R8G8B8A8_UNORM:
 		supported = true;

source/renderer/backend/gl/Texture.cpp

@@ -244,6 +244,16 @@ std::unique_ptr<CTexture> CTexture::Create(
 			pixelFormat = GL_DEPTH_STENCIL_EXT;
 			pixelType = GL_UNSIGNED_INT_24_8_EXT;
 			break;
+		case Format::R16G16B16A16_SFLOAT:
+			internalFormat = GL_RGBA16F_ARB;
+			pixelFormat = GL_RGBA;
+			pixelType = GL_HALF_FLOAT;
+			break;
+		case Format::R32G32B32A32_SFLOAT:
+			internalFormat = GL_RGBA32F_ARB;
+			pixelFormat = GL_RGBA;
+			pixelType = GL_FLOAT;
+			break;
 #endif
 		case Format::BC1_RGB_UNORM:
 		case Format::BC1_RGBA_UNORM:
@@ -273,6 +283,14 @@ std::unique_ptr<CTexture> CTexture::Create(
 		{
 			glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCount, GL_RGBA8, width, height, GL_TRUE);
 		}
+		else if (format == Format::R16G16B16A16_SFLOAT)
+		{
+			glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCount, GL_RGBA16F_ARB, width, height, GL_TRUE);
+		}
+		else if (format == Format::R32G32B32A32_SFLOAT)
+		{
+			glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCount, GL_RGBA32F_ARB, width, height, GL_TRUE);
+		}
 		else if (format == Format::D24_UNORM_S8_UINT)
 		{
 			glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCount, GL_DEPTH24_STENCIL8_EXT, width, height, GL_TRUE);

source/renderer/backend/vulkan/Mapping.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -195,6 +195,8 @@ VkFormat FromFormat(const Format format)
 	CASE(R32G32B32_SFLOAT)
 	CASE(R32G32B32A32_SFLOAT)
 
+	CASE2(B10G11R11_UFLOAT, B10G11R11_UFLOAT_PACK32)
+
 	CASE(D16_UNORM)
 	CASE2(D24_UNORM, X8_D24_UNORM_PACK32)
 	CASE(D24_UNORM_S8_UINT)