diff --git a/vendor/sdl3/sdl3_blendmode.odin b/vendor/sdl3/sdl3_blendmode.odin
new file mode 100644
index 000000000..dd732e45f
--- /dev/null
+++ b/vendor/sdl3/sdl3_blendmode.odin
@@ -0,0 +1,55 @@
+package sdl3
+
+import "core:c"
+
+BlendMode :: distinct bit_set[BlendModeFlag; Uint32]
+
+BlendModeFlag :: enum Uint32 {
+	BLEND               = 0, // log2(0x00000001)
+	BLEND_PREMULTIPLIED = 4, // log2(0x00000010)
+	ADD                 = 1, // log2(0x00000002)
+	ADD_PREMULTIPLIED   = 5, // log2(0x00000020)
+	MOD                 = 2, // log2(0x00000004)
+	MUL                 = 3, // log2(0x00000008)
+}
+
+BLENDMODE_NONE                :: BlendMode{}                     /**< no blending: dstRGBA = srcRGBA */
+BLENDMODE_BLEND               :: BlendMode{.BLEND}               /**< alpha blending: dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA)), dstA = srcA + (dstA * (1-srcA)) */
+BLENDMODE_BLEND_PREMULTIPLIED :: BlendMode{.BLEND_PREMULTIPLIED} /**< pre-multiplied alpha blending: dstRGBA = srcRGBA + (dstRGBA * (1-srcA)) */
+BLENDMODE_ADD                 :: BlendMode{.ADD}                 /**< additive blending: dstRGB = (srcRGB * srcA) + dstRGB, dstA = dstA */
+BLENDMODE_ADD_PREMULTIPLIED   :: BlendMode{.ADD_PREMULTIPLIED}   /**< pre-multiplied additive blending: dstRGB = srcRGB + dstRGB, dstA = dstA */
+BLENDMODE_MOD                 :: BlendMode{.MOD}                 /**< color modulate: dstRGB = srcRGB * dstRGB, dstA = dstA */
+BLENDMODE_MUL                 :: BlendMode{.MUL}                 /**< color multiply: dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA)), dstA = dstA */
+BLENDMODE_INVALID             :: transmute(BlendMode)Uint32(0x7FFFFFFF)
+
+
+BlendOperation :: enum c.int {
+	ADD              = 0x1,  /**< dst + src: supported by all renderers */
+	SUBTRACT         = 0x2,  /**< src - dst : supported by D3D, OpenGL, OpenGLES, and Vulkan */
+	REV_SUBTRACT     = 0x3,  /**< dst - src : supported by D3D, OpenGL, OpenGLES, and Vulkan */
+	MINIMUM          = 0x4,  /**< min(dst, src) : supported by D3D, OpenGL, OpenGLES, and Vulkan */
+	MAXIMUM          = 0x5,  /**< max(dst, src) : supported by D3D, OpenGL, OpenGLES, and Vulkan */
+}
+
+BlendFactor :: enum c.int {
+	ZERO                = 0x1,  /**< 0, 0, 0, 0 */
+	ONE                 = 0x2,  /**< 1, 1, 1, 1 */
+	SRC_COLOR           = 0x3,  /**< srcR, srcG, srcB, srcA */
+	ONE_MINUS_SRC_COLOR = 0x4,  /**< 1-srcR, 1-srcG, 1-srcB, 1-srcA */
+	SRC_ALPHA           = 0x5,  /**< srcA, srcA, srcA, srcA */
+	ONE_MINUS_SRC_ALPHA = 0x6,  /**< 1-srcA, 1-srcA, 1-srcA, 1-srcA */
+	DST_COLOR           = 0x7,  /**< dstR, dstG, dstB, dstA */
+	ONE_MINUS_DST_COLOR = 0x8,  /**< 1-dstR, 1-dstG, 1-dstB, 1-dstA */
+	DST_ALPHA           = 0x9,  /**< dstA, dstA, dstA, dstA */
+	ONE_MINUS_DST_ALPHA = 0xA,  /**< 1-dstA, 1-dstA, 1-dstA, 1-dstA */
+}
+
+@(default_calling_convention="c", link_prefix="SDL_", require_results)
+foreign lib {
+	ComposeCustomBlendMode :: proc(srcColorFactor: BlendFactor,
+	                               dstColorFactor: BlendFactor,
+	                               colorOperation: BlendOperation,
+	                               srcAlphaFactor: BlendFactor,
+	                               dstAlphaFactor: BlendFactor,
+	                               alphaOperation: BlendOperation) -> BlendMode ---
+}
\ No newline at end of file