

#include <nitro/gx/g2.h>
void G2S_SetBlendAlpha(
int plane1 /* GXBlendPlaneMask */,
int plane2 /* GXBlendPlaneMask */,
int ev1,
int ev2
);
| plane1 | Selects the first target plane for blending (result of logical OR with GXBlendPlaneMask type values) |
| plane2 | Selects the second target plane for blending (result of logical OR with GXBlendPlaneMask type values) |
ev1 |
Alpha-blending coefficient for the first target screen (0 ≤ ev1 ≤ 31) |
ev2 |
Alpha-blending coefficient for the second target screen (0 ≤ ev2 ≤ 31) |
None.
If the value of ev1 or ev2 is greater than 16, the alpha-blending coefficient is set to 16.
Alpha blending will be performed using the sub 2D Engine if the second target plane immediately follows the first target plane. Even if no OBJ is specified in the first target screen, alpha-blending is performed on the translucent OBJ, bitmap OBJ, and 3D screen.
GX_BLEND_PLANEMASK_NONE |
No plane is specified. |
GX_BLEND_PLANEMASK_BG0 |
Specifies BG0. |
GX_BLEND_PLANEMASK_BG1 |
Specifies BG1. |
GX_BLEND_PLANEMASK_BG2 |
Specifies BG2. |
GX_BLEND_PLANEMASK_BG3 |
Specifies BG3. |
GX_BLEND_PLANEMASK_OBJ |
Specifies OBJs. |
GX_BLEND_PLANEMASK_BD |
Specifies the backdrop plane. |
The following indicates the type definition for GXBlendPlaneMask types.
typedef enum
{
GX_BLEND_PLANEMASK_NONE = 0x0000,
GX_BLEND_PLANEMASK_BG0 = 0x0001,
GX_BLEND_PLANEMASK_BG1 = 0x0002,
GX_BLEND_PLANEMASK_BG2 = 0x0004,
GX_BLEND_PLANEMASK_BG3 = 0x0008,
GX_BLEND_PLANEMASK_OBJ = 0x0010,
GX_BLEND_PLANEMASK_BD = 0x0020
}
GXBlendPlaneMask;
G2S_BlendNone, G2S_SetBlendBrightness, G2S_SetBlendBrightnessExt, G2S_ChangeBlendAlpha, G2S_ChangeBlendBrightness
2008/10/30 Added description of the alpha-blending coefficients.
2004/02/09 Initial version.
CONFIDENTIAL