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direct3d: Implement missing blend operations.

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This is only for Direct3D 9; Direct3D 11 already had this implemented.

Fixes #5375.
This commit is contained in:
Ryan C. Gordon 2022-03-27 09:12:12 -04:00
parent a630b02938
commit 7bc498d325
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GPG key ID: FA148B892AB48044
2 changed files with 39 additions and 15 deletions
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10
include/SDL_blendmode.h
View file

@ -67,9 +67,8 @@ 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 D3D11 */
SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D11 */
SDL_BLENDOPERATION_MINIMUM = 0x4, /**< min(dst, src) : supported by D3D9, D3D11 */
SDL_BLENDOPERATION_MAXIMUM = 0x5 /**< max(dst, src) : supported by D3D9, D3D11 */
} SDL_BlendOperation;
/**
@ -87,7 +86,6 @@ typedef enum
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;
/**
@ -135,10 +133,10 @@ typedef enum
* SDL 2.0.6. All renderers support the four blend modes listed in the
* SDL_BlendMode enumeration.
*
* - **direct3d**: Supports `SDL_BLENDOPERATION_ADD` with all factors.
* - **direct3d11**: Supports all operations with all factors. However, some
* - **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.

44
src/render/direct3d/SDL_render_d3d.c
View file

@ -347,7 +347,8 @@ D3D_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
}
}
static D3DBLEND GetBlendFunc(SDL_BlendFactor factor)
static D3DBLEND
GetBlendFunc(SDL_BlendFactor factor)
{
switch (factor) {
case SDL_BLENDFACTOR_ZERO:
@ -370,9 +371,28 @@ static D3DBLEND GetBlendFunc(SDL_BlendFactor factor)
return D3DBLEND_DESTALPHA;
case SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA:
return D3DBLEND_INVDESTALPHA;
default:
return (D3DBLEND)0;
default: break;
}
return (D3DBLEND) 0;
}
static D3DBLENDOP
GetBlendEquation(SDL_BlendOperation operation)
{
switch (operation) {
case SDL_BLENDOPERATION_ADD:
return D3DBLENDOP_ADD;
case SDL_BLENDOPERATION_SUBTRACT:
return D3DBLENDOP_SUBTRACT;
case SDL_BLENDOPERATION_REV_SUBTRACT:
return D3DBLENDOP_REVSUBTRACT;
case SDL_BLENDOPERATION_MINIMUM:
return D3DBLENDOP_MIN;
case SDL_BLENDOPERATION_MAXIMUM:
return D3DBLENDOP_MAX;
default: break;
}
return (D3DBLENDOP) 0;
}
static SDL_bool
@ -387,14 +407,16 @@ D3D_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
SDL_BlendOperation alphaOperation = SDL_GetBlendModeAlphaOperation(blendMode);
if (!GetBlendFunc(srcColorFactor) || !GetBlendFunc(srcAlphaFactor) ||
!GetBlendFunc(dstColorFactor) || !GetBlendFunc(dstAlphaFactor)) {
!GetBlendEquation(colorOperation) ||
!GetBlendFunc(dstColorFactor) || !GetBlendFunc(dstAlphaFactor) ||
!GetBlendEquation(alphaOperation)) {
return SDL_FALSE;
}
if ((srcColorFactor != srcAlphaFactor || dstColorFactor != dstAlphaFactor) && !data->enableSeparateAlphaBlend) {
return SDL_FALSE;
}
if (colorOperation != SDL_BLENDOPERATION_ADD || alphaOperation != SDL_BLENDOPERATION_ADD) {
return SDL_FALSE;
if (!data->enableSeparateAlphaBlend) {
if ((srcColorFactor != srcAlphaFactor) || (dstColorFactor != dstAlphaFactor) || (colorOperation != alphaOperation)) {
return SDL_FALSE;
}
}
return SDL_TRUE;
}
@ -1040,11 +1062,15 @@ SetDrawState(D3D_RenderData *data, const SDL_RenderCommand *cmd)
GetBlendFunc(SDL_GetBlendModeSrcColorFactor(blend)));
IDirect3DDevice9_SetRenderState(data->device, D3DRS_DESTBLEND,
GetBlendFunc(SDL_GetBlendModeDstColorFactor(blend)));
IDirect3DDevice9_SetRenderState(data->device, D3DRS_BLENDOP,
GetBlendEquation(SDL_GetBlendModeColorOperation(blend)));
if (data->enableSeparateAlphaBlend) {
IDirect3DDevice9_SetRenderState(data->device, D3DRS_SRCBLENDALPHA,
GetBlendFunc(SDL_GetBlendModeSrcAlphaFactor(blend)));
IDirect3DDevice9_SetRenderState(data->device, D3DRS_DESTBLENDALPHA,
GetBlendFunc(SDL_GetBlendModeDstAlphaFactor(blend)));
IDirect3DDevice9_SetRenderState(data->device, D3DRS_BLENDOPALPHA,
GetBlendEquation(SDL_GetBlendModeAlphaOperation(blend)));
}
}