1 /* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> 4 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. 8 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: 12 13 1. The origin of this software must not be misrepresented; you must not 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. 20 */ 21 22 /** 23 * \file SDL_blendmode.h 24 * 25 * Header file declaring the SDL_BlendMode enumeration 26 */ 27 28 #ifndef SDL_blendmode_h_ 29 #define SDL_blendmode_h_ 30 31 #include "begin_code.h" 32 /* Set up for C function definitions, even when using C++ */ 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /** 38 * \brief The blend mode used in SDL_RenderCopy() and drawing operations. 39 */ 40 typedef enum 41 { 42 SDL_BLENDMODE_NONE = 0x00000000, /**< no blending 43 dstRGBA = srcRGBA */ 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 49 dstA = dstA */ 50 SDL_BLENDMODE_MOD = 0x00000004, /**< color modulate 51 dstRGB = srcRGB * dstRGB 52 dstA = dstA */ 53 SDL_BLENDMODE_MUL = 0x00000008, /**< color multiply 54 dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA)) 55 dstA = (srcA * dstA) + (dstA * (1-srcA)) */ 56 SDL_BLENDMODE_INVALID = 0x7FFFFFFF 57 58 /* Additional custom blend modes can be returned by SDL_ComposeCustomBlendMode() */ 59 60 } SDL_BlendMode; 61 62 /** 63 * \brief The blend operation used when combining source and destination pixel components 64 */ 65 typedef enum 66 { 67 SDL_BLENDOPERATION_ADD = 0x1, /**< dst + src: supported by all renderers */ 68 SDL_BLENDOPERATION_SUBTRACT = 0x2, /**< dst - src : supported by D3D9, D3D11, OpenGL, OpenGLES */ 69 SDL_BLENDOPERATION_REV_SUBTRACT = 0x3, /**< src - dst : supported by D3D9, D3D11, OpenGL, OpenGLES */ 70 SDL_BLENDOPERATION_MINIMUM = 0x4, /**< min(dst, src) : supported by D3D11 */ 71 SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D11 */ 72 73 } SDL_BlendOperation; 74 75 /** 76 * \brief The normalized factor used to multiply pixel components 77 */ 78 typedef enum 79 { 80 SDL_BLENDFACTOR_ZERO = 0x1, /**< 0, 0, 0, 0 */ 81 SDL_BLENDFACTOR_ONE = 0x2, /**< 1, 1, 1, 1 */ 82 SDL_BLENDFACTOR_SRC_COLOR = 0x3, /**< srcR, srcG, srcB, srcA */ 83 SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR = 0x4, /**< 1-srcR, 1-srcG, 1-srcB, 1-srcA */ 84 SDL_BLENDFACTOR_SRC_ALPHA = 0x5, /**< srcA, srcA, srcA, srcA */ 85 SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA = 0x6, /**< 1-srcA, 1-srcA, 1-srcA, 1-srcA */ 86 SDL_BLENDFACTOR_DST_COLOR = 0x7, /**< dstR, dstG, dstB, dstA */ 87 SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR = 0x8, /**< 1-dstR, 1-dstG, 1-dstB, 1-dstA */ 88 SDL_BLENDFACTOR_DST_ALPHA = 0x9, /**< dstA, dstA, dstA, dstA */ 89 SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA = 0xA /**< 1-dstA, 1-dstA, 1-dstA, 1-dstA */ 90 91 } SDL_BlendFactor; 92 93 /** 94 * \brief Create a custom blend mode, which may or may not be supported by a given renderer 95 * 96 * \param srcColorFactor source color factor 97 * \param dstColorFactor destination color factor 98 * \param colorOperation color operation 99 * \param srcAlphaFactor source alpha factor 100 * \param dstAlphaFactor destination alpha factor 101 * \param alphaOperation alpha operation 102 * 103 * The result of the blend mode operation will be: 104 * dstRGB = dstRGB * dstColorFactor colorOperation srcRGB * srcColorFactor 105 * and 106 * dstA = dstA * dstAlphaFactor alphaOperation srcA * srcAlphaFactor 107 */ 108 extern DECLSPEC SDL_BlendMode SDLCALL SDL_ComposeCustomBlendMode(SDL_BlendFactor srcColorFactor, 109 SDL_BlendFactor dstColorFactor, 110 SDL_BlendOperation colorOperation, 111 SDL_BlendFactor srcAlphaFactor, 112 SDL_BlendFactor dstAlphaFactor, 113 SDL_BlendOperation alphaOperation); 114 115 /* Ends C function definitions when using C++ */ 116 #ifdef __cplusplus 117 } 118 #endif 119 #include "close_code.h" 120 121 #endif /* SDL_blendmode_h_ */ 122 123 /* vi: set ts=4 sw=4 expandtab: */ 124