2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
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14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
23 * \file SDL_blendmode.h
25 * Header file declaring the SDL_BlendMode enumeration
28 #ifndef SDL_blendmode_h_
29 #define SDL_blendmode_h_
31 #include "begin_code.h"
32 /* Set up for C function definitions, even when using C++ */
38 * \brief The blend mode used in SDL_RenderCopy() and drawing operations.
42 SDL_BLENDMODE_NONE = 0x00000000, /**< no blending
44 SDL_BLENDMODE_BLEND = 0x00000001, /**< alpha blending
45 dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
46 dstA = srcA + (dstA * (1-srcA)) */
47 SDL_BLENDMODE_ADD = 0x00000002, /**< additive blending
48 dstRGB = (srcRGB * srcA) + dstRGB
50 SDL_BLENDMODE_MOD = 0x00000004, /**< color modulate
51 dstRGB = srcRGB * dstRGB
53 SDL_BLENDMODE_INVALID = 0x7FFFFFFF
55 /* Additional custom blend modes can be returned by SDL_ComposeCustomBlendMode() */
60 * \brief The blend operation used when combining source and destination pixel components
64 SDL_BLENDOPERATION_ADD = 0x1, /**< dst + src: supported by all renderers */
65 SDL_BLENDOPERATION_SUBTRACT = 0x2, /**< dst - src : supported by D3D9, D3D11, OpenGL, OpenGLES */
66 SDL_BLENDOPERATION_REV_SUBTRACT = 0x3, /**< src - dst : supported by D3D9, D3D11, OpenGL, OpenGLES */
67 SDL_BLENDOPERATION_MINIMUM = 0x4, /**< min(dst, src) : supported by D3D11 */
68 SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D11 */
73 * \brief The normalized factor used to multiply pixel components
77 SDL_BLENDFACTOR_ZERO = 0x1, /**< 0, 0, 0, 0 */
78 SDL_BLENDFACTOR_ONE = 0x2, /**< 1, 1, 1, 1 */
79 SDL_BLENDFACTOR_SRC_COLOR = 0x3, /**< srcR, srcG, srcB, srcA */
80 SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR = 0x4, /**< 1-srcR, 1-srcG, 1-srcB, 1-srcA */
81 SDL_BLENDFACTOR_SRC_ALPHA = 0x5, /**< srcA, srcA, srcA, srcA */
82 SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA = 0x6, /**< 1-srcA, 1-srcA, 1-srcA, 1-srcA */
83 SDL_BLENDFACTOR_DST_COLOR = 0x7, /**< dstR, dstG, dstB, dstA */
84 SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR = 0x8, /**< 1-dstR, 1-dstG, 1-dstB, 1-dstA */
85 SDL_BLENDFACTOR_DST_ALPHA = 0x9, /**< dstA, dstA, dstA, dstA */
86 SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA = 0xA /**< 1-dstA, 1-dstA, 1-dstA, 1-dstA */
91 * \brief Create a custom blend mode, which may or may not be supported by a given renderer
93 * \param srcColorFactor source color factor
94 * \param dstColorFactor destination color factor
95 * \param colorOperation color operation
96 * \param srcAlphaFactor source alpha factor
97 * \param dstAlphaFactor destination alpha factor
98 * \param alphaOperation alpha operation
100 * The result of the blend mode operation will be:
101 * dstRGB = dstRGB * dstColorFactor colorOperation srcRGB * srcColorFactor
103 * dstA = dstA * dstAlphaFactor alphaOperation srcA * srcAlphaFactor
105 extern DECLSPEC SDL_BlendMode SDLCALL SDL_ComposeCustomBlendMode(SDL_BlendFactor srcColorFactor,
106 SDL_BlendFactor dstColorFactor,
107 SDL_BlendOperation colorOperation,
108 SDL_BlendFactor srcAlphaFactor,
109 SDL_BlendFactor dstAlphaFactor,
110 SDL_BlendOperation alphaOperation);
112 /* Ends C function definitions when using C++ */
116 #include "close_code.h"
118 #endif /* SDL_blendmode_h_ */
120 /* vi: set ts=4 sw=4 expandtab: */