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Added SDL_BLENDMODE_BLEND_PREMULTIPLIED and SDL_BLENDMODE_ADD_PREMULTIPLIED

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Fixes https://github.com/libsdl-org/SDL/issues/2485
This commit is contained in:
Sam Lantinga
2024-07-15 08:27:58 -07:00
parent f099898a66
commit df573391b1
22 changed files with 6831 additions and 1371 deletions
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46
include/SDL3/SDL_blendmode.h
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@@ -41,8 +41,9 @@ extern "C" {
/**
* A set of blend modes used in drawing operations.
*
* Note that additional values may be obtained from
* SDL_ComposeCustomBlendMode.
* These predefined blend modes are supported everywhere.
*
* Additional values may be obtained from SDL_ComposeCustomBlendMode.
*
* \since This datatype is available since SDL 3.0.0.
*
@@ -50,20 +51,25 @@ extern "C" {
*/
typedef Uint32 SDL_BlendMode;
#define SDL_BLENDMODE_NONE 0x00000000u /**< no blending
dstRGBA = srcRGBA */
#define SDL_BLENDMODE_BLEND 0x00000001u /**< alpha blending
dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
dstA = srcA + (dstA * (1-srcA)) */
#define SDL_BLENDMODE_ADD 0x00000002u /**< additive blending
dstRGB = (srcRGB * srcA) + dstRGB
dstA = dstA */
#define SDL_BLENDMODE_MOD 0x00000004u /**< color modulate
dstRGB = srcRGB * dstRGB
dstA = dstA */
#define SDL_BLENDMODE_MUL 0x00000008u /**< color multiply
dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA))
dstA = dstA */
#define SDL_BLENDMODE_NONE 0x00000000u /**< no blending
dstRGBA = srcRGBA */
#define SDL_BLENDMODE_BLEND 0x00000001u /**< alpha blending
dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
dstA = srcA + (dstA * (1-srcA)) */
#define SDL_BLENDMODE_BLEND_PREMULTIPLIED 0x00000010u /**< pre-multiplied alpha blending
dstRGBA = srcRGBA + (dstRGBA * (1-srcA)) */
#define SDL_BLENDMODE_ADD 0x00000002u /**< additive blending
dstRGB = (srcRGB * srcA) + dstRGB
dstA = dstA */
#define SDL_BLENDMODE_ADD_PREMULTIPLIED 0x00000020u /**< pre-multiplied additive blending
dstRGB = srcRGB + dstRGB
dstA = dstA */
#define SDL_BLENDMODE_MOD 0x00000004u /**< color modulate
dstRGB = srcRGB * dstRGB
dstA = dstA */
#define SDL_BLENDMODE_MUL 0x00000008u /**< color multiply
dstRGB = (srcRGB * dstRGB) + (dstRGB * (1-srcA))
dstA = dstA */
#define SDL_BLENDMODE_INVALID 0x7FFFFFFFu
/**
@@ -75,10 +81,10 @@ typedef Uint32 SDL_BlendMode;
typedef enum SDL_BlendOperation
{
SDL_BLENDOPERATION_ADD = 0x1, /**< dst + src: supported by all renderers */
SDL_BLENDOPERATION_SUBTRACT = 0x2, /**< src - dst : supported by D3D9, D3D11, OpenGL, OpenGLES */
SDL_BLENDOPERATION_REV_SUBTRACT = 0x3, /**< dst - src : 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_SUBTRACT = 0x2, /**< src - dst : supported by D3D, OpenGL, OpenGLES, and Vulkan */
SDL_BLENDOPERATION_REV_SUBTRACT = 0x3, /**< dst - src : supported by D3D, OpenGL, OpenGLES, and Vulkan */
SDL_BLENDOPERATION_MINIMUM = 0x4, /**< min(dst, src) : supported by D3D, OpenGL, OpenGLES, and Vulkan */
SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D, OpenGL, OpenGLES, and Vulkan */
} SDL_BlendOperation;
/**