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Diffstat (limited to 'dependencies/SDL/SDL_blendmode.h')
| -rw-r--r-- | dependencies/SDL/SDL_blendmode.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/dependencies/SDL/SDL_blendmode.h b/dependencies/SDL/SDL_blendmode.h new file mode 100644 index 0000000..08c9f9d --- /dev/null +++ b/dependencies/SDL/SDL_blendmode.h @@ -0,0 +1,198 @@ +/* + 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. +*/ + +/** + * \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_MUL = 0x00000008, /**< color multiply + dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA)) + dstA = (srcA * dstA) + (dstA * (1-srcA)) */ + 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 D3D9, D3D11 */ + SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D9, 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; + +/** + * Compose a custom blend mode for renderers. + * + * The functions SDL_SetRenderDrawBlendMode and SDL_SetTextureBlendMode accept + * the SDL_BlendMode returned by this function if the renderer supports it. + * + * A blend mode controls how the pixels from a drawing operation (source) get + * combined with the pixels from the render target (destination). First, the + * components of the source and destination pixels get multiplied with their + * blend factors. Then, the blend operation takes the two products and + * calculates the result that will get stored in the render target. + * + * Expressed in pseudocode, it would look like this: + * + * ```c + * dstRGB = colorOperation(srcRGB * srcColorFactor, dstRGB * dstColorFactor); + * dstA = alphaOperation(srcA * srcAlphaFactor, dstA * dstAlphaFactor); + * ``` + * + * Where the functions `colorOperation(src, dst)` and `alphaOperation(src, + * dst)` can return one of the following: + * + * - `src + dst` + * - `src - dst` + * - `dst - src` + * - `min(src, dst)` + * - `max(src, dst)` + * + * The red, green, and blue components are always multiplied with the first, + * second, and third components of the SDL_BlendFactor, respectively. The + * fourth component is not used. + * + * The alpha component is always multiplied with the fourth component of the + * SDL_BlendFactor. The other components are not used in the alpha + * calculation. + * + * Support for these blend modes varies for each renderer. To check if a + * specific SDL_BlendMode is supported, create a renderer and pass it to + * either SDL_SetRenderDrawBlendMode or SDL_SetTextureBlendMode. They will + * return with an error if the blend mode is not supported. + * + * This list describes the support of custom blend modes for each renderer in + * SDL 2.0.6. All renderers support the four blend modes listed in the + * SDL_BlendMode enumeration. + * + * - **direct3d**: Supports all operations with all factors. However, some + * factors produce unexpected results with `SDL_BLENDOPERATION_MINIMUM` and + * `SDL_BLENDOPERATION_MAXIMUM`. + * - **direct3d11**: Same as Direct3D 9. + * - **opengl**: Supports the `SDL_BLENDOPERATION_ADD` operation with all + * factors. OpenGL versions 1.1, 1.2, and 1.3 do not work correctly with SDL + * 2.0.6. + * - **opengles**: Supports the `SDL_BLENDOPERATION_ADD` operation with all + * factors. Color and alpha factors need to be the same. OpenGL ES 1 + * implementation specific: May also support `SDL_BLENDOPERATION_SUBTRACT` + * and `SDL_BLENDOPERATION_REV_SUBTRACT`. May support color and alpha + * operations being different from each other. May support color and alpha + * factors being different from each other. + * - **opengles2**: Supports the `SDL_BLENDOPERATION_ADD`, + * `SDL_BLENDOPERATION_SUBTRACT`, `SDL_BLENDOPERATION_REV_SUBTRACT` + * operations with all factors. + * - **psp**: No custom blend mode support. + * - **software**: No custom blend mode support. + * + * Some renderers do not provide an alpha component for the default render + * target. The `SDL_BLENDFACTOR_DST_ALPHA` and + * `SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA` factors do not have an effect in this + * case. + * + * \param srcColorFactor the SDL_BlendFactor applied to the red, green, and + * blue components of the source pixels + * \param dstColorFactor the SDL_BlendFactor applied to the red, green, and + * blue components of the destination pixels + * \param colorOperation the SDL_BlendOperation used to combine the red, + * green, and blue components of the source and + * destination pixels + * \param srcAlphaFactor the SDL_BlendFactor applied to the alpha component of + * the source pixels + * \param dstAlphaFactor the SDL_BlendFactor applied to the alpha component of + * the destination pixels + * \param alphaOperation the SDL_BlendOperation used to combine the alpha + * component of the source and destination pixels + * \returns an SDL_BlendMode that represents the chosen factors and + * operations. + * + * \since This function is available since SDL 2.0.6. + * + * \sa SDL_SetRenderDrawBlendMode + * \sa SDL_GetRenderDrawBlendMode + * \sa SDL_SetTextureBlendMode + * \sa SDL_GetTextureBlendMode + */ +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: */ |