DirectX 12 Renderer (#5761)

* DirectX 12 Renderer (27 squashed commits)

* Add missing SDL_hidapi.h of merge of SDL.vcxproj.filters

* Fixed OpenWatcom build failure

* Dynapi fix

Co-authored-by: Ryan C. Gordon <icculus@icculus.org>

src/render/SDL_d3dmath.c

@@ -20,7 +20,7 @@
 */
 #include "../SDL_internal.h"
 
-#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED
+#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11 || SDL_VIDEO_RENDER_D3D12) && !SDL_RENDER_DISABLED
 #include "SDL_stdinc.h"
 
 #include "SDL_d3dmath.h"
@@ -131,6 +131,6 @@ Float4X4 MatrixRotationZ(float r)
 
 }
 
-#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED */
+#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11 || SDL_VIDEO_RENDER_D3D12) && !SDL_RENDER_DISABLED */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/render/SDL_d3dmath.h

@@ -20,7 +20,7 @@
 */
 #include "../SDL_internal.h"
 
-#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED
+#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11 || SDL_VIDEO_RENDER_D3D12) && !SDL_RENDER_DISABLED
 
 /* Direct3D matrix math functions */
 
@@ -67,6 +67,6 @@ Float4X4 MatrixRotationX(float r);
 Float4X4 MatrixRotationY(float r);
 Float4X4 MatrixRotationZ(float r);
 
-#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED */
+#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11 || SDL_VIDEO_RENDER_D3D12) && !SDL_RENDER_DISABLED */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/render/SDL_render.c

@@ -96,6 +96,9 @@ static const SDL_RenderDriver *render_drivers[] = {
 #if SDL_VIDEO_RENDER_D3D11
     &D3D11_RenderDriver,
 #endif
+#if SDL_VIDEO_RENDER_D3D12
+    &D3D12_RenderDriver,
+#endif
 #if SDL_VIDEO_RENDER_METAL
     &METAL_RenderDriver,
 #endif

src/render/SDL_sysrender.h

@@ -283,6 +283,7 @@ struct SDL_RenderDriver
 /* Not all of these are available in a given build. Use #ifdefs, etc. */
 extern SDL_RenderDriver D3D_RenderDriver;
 extern SDL_RenderDriver D3D11_RenderDriver;
+extern SDL_RenderDriver D3D12_RenderDriver;
 extern SDL_RenderDriver GL_RenderDriver;
 extern SDL_RenderDriver GLES2_RenderDriver;
 extern SDL_RenderDriver GLES_RenderDriver;

src/render/direct3d12/SDL_shaders_d3d12.h

@@ -0,0 +1,57 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+/* D3D12 shader implementation */
+
+typedef enum {
+    SHADER_SOLID,
+    SHADER_RGB,
+#if SDL_HAVE_YUV
+    SHADER_YUV_JPEG,
+    SHADER_YUV_BT601,
+    SHADER_YUV_BT709,
+    SHADER_NV12_JPEG,
+    SHADER_NV12_BT601,
+    SHADER_NV12_BT709,
+    SHADER_NV21_JPEG,
+    SHADER_NV21_BT601,
+    SHADER_NV21_BT709,
+#endif
+    NUM_SHADERS
+} D3D12_Shader;
+
+typedef enum {
+    ROOTSIG_COLOR,
+    ROOTSIG_TEXTURE,
+#if SDL_HAVE_YUV
+    ROOTSIG_YUV,
+    ROOTSIG_NV,
+#endif
+    NUM_ROOTSIGS
+} D3D12_RootSignature;
+
+extern void D3D12_GetVertexShader(D3D12_Shader shader, D3D12_SHADER_BYTECODE *outBytecode);
+extern void D3D12_GetPixelShader(D3D12_Shader shader, D3D12_SHADER_BYTECODE *outBytecode);
+extern D3D12_RootSignature D3D12_GetRootSignatureType(D3D12_Shader shader);
+extern void D3D12_GetRootSignatureData(D3D12_RootSignature rootSig, D3D12_SHADER_BYTECODE* outBytecode);
+
+/* vi: set ts=4 sw=4 expandtab: */