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diff --git a/third_party/sdl/include/SDL2/SDL_blendmode.h b/third_party/sdl/include/SDL2/SDL_blendmode.h
new file mode 100644
index 0000000..36a5ea7
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+++ b/third_party/sdl/include/SDL2/SDL_blendmode.h
@@ -0,0 +1,120 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 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.
+*/
+
+/**
+ *  \file SDL_blendmode.h
+ *
+ *  Header file declaring the SDL_BlendMode enumeration
+ */
+
+#ifndef SDL_blendmode_h_
+#define SDL_blendmode_h_
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \brief The blend mode used in SDL_RenderCopy() and drawing operations.
+ */
+typedef enum
+{
+    SDL_BLENDMODE_NONE = 0x00000000,     /**< no blending
+                                              dstRGBA = srcRGBA */
+    SDL_BLENDMODE_BLEND = 0x00000001,    /**< alpha blending
+                                              dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
+                                              dstA = srcA + (dstA * (1-srcA)) */
+    SDL_BLENDMODE_ADD = 0x00000002,      /**< additive blending
+                                              dstRGB = (srcRGB * srcA) + dstRGB
+                                              dstA = dstA */
+    SDL_BLENDMODE_MOD = 0x00000004,      /**< color modulate
+                                              dstRGB = srcRGB * dstRGB
+                                              dstA = dstA */
+    SDL_BLENDMODE_INVALID = 0x7FFFFFFF
+
+    /* Additional custom blend modes can be returned by SDL_ComposeCustomBlendMode() */
+
+} SDL_BlendMode;
+
+/**
+ *  \brief The blend operation used when combining source and destination pixel components
+ */
+typedef enum
+{
+    SDL_BLENDOPERATION_ADD              = 0x1,  /**< dst + src: supported by all renderers */
+    SDL_BLENDOPERATION_SUBTRACT         = 0x2,  /**< dst - src : supported by D3D9, D3D11, OpenGL, OpenGLES */
+    SDL_BLENDOPERATION_REV_SUBTRACT     = 0x3,  /**< src - dst : supported by D3D9, D3D11, OpenGL, OpenGLES */
+    SDL_BLENDOPERATION_MINIMUM          = 0x4,  /**< min(dst, src) : supported by D3D11 */
+    SDL_BLENDOPERATION_MAXIMUM          = 0x5   /**< max(dst, src) : supported by D3D11 */
+
+} SDL_BlendOperation;
+
+/**
+ *  \brief The normalized factor used to multiply pixel components
+ */
+typedef enum
+{
+    SDL_BLENDFACTOR_ZERO                = 0x1,  /**< 0, 0, 0, 0 */
+    SDL_BLENDFACTOR_ONE                 = 0x2,  /**< 1, 1, 1, 1 */
+    SDL_BLENDFACTOR_SRC_COLOR           = 0x3,  /**< srcR, srcG, srcB, srcA */
+    SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR = 0x4,  /**< 1-srcR, 1-srcG, 1-srcB, 1-srcA */
+    SDL_BLENDFACTOR_SRC_ALPHA           = 0x5,  /**< srcA, srcA, srcA, srcA */
+    SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA = 0x6,  /**< 1-srcA, 1-srcA, 1-srcA, 1-srcA */
+    SDL_BLENDFACTOR_DST_COLOR           = 0x7,  /**< dstR, dstG, dstB, dstA */
+    SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR = 0x8,  /**< 1-dstR, 1-dstG, 1-dstB, 1-dstA */
+    SDL_BLENDFACTOR_DST_ALPHA           = 0x9,  /**< dstA, dstA, dstA, dstA */
+    SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA = 0xA   /**< 1-dstA, 1-dstA, 1-dstA, 1-dstA */
+
+} SDL_BlendFactor;
+
+/**
+ *  \brief Create a custom blend mode, which may or may not be supported by a given renderer
+ *
+ *  \param srcColorFactor
+ *  \param dstColorFactor
+ *  \param colorOperation
+ *  \param srcAlphaFactor
+ *  \param dstAlphaFactor
+ *  \param alphaOperation
+ *
+ *  The result of the blend mode operation will be:
+ *      dstRGB = dstRGB * dstColorFactor colorOperation srcRGB * srcColorFactor
+ *  and
+ *      dstA = dstA * dstAlphaFactor alphaOperation srcA * srcAlphaFactor
+ */
+extern DECLSPEC SDL_BlendMode SDLCALL SDL_ComposeCustomBlendMode(SDL_BlendFactor srcColorFactor,
+                                                                 SDL_BlendFactor dstColorFactor,
+                                                                 SDL_BlendOperation colorOperation,
+                                                                 SDL_BlendFactor srcAlphaFactor,
+                                                                 SDL_BlendFactor dstAlphaFactor,
+                                                                 SDL_BlendOperation alphaOperation);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_blendmode_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */