[DISCUSSION] Debug menu for Listing backgrounds, objs, etc


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Main - Development - [DISCUSSION] Debug menu for Listing backgrounds, objs, etc

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diegovsky

Posted on 07-22-25 11:20 PM

Link | #7822

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Since: 07-22-25

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Hey so I'm a newbie here and I would love to contribute to melonDS.

I've been developing my own homebrew game but have been stumbling upon some graphics problems and having a debug window to visually show
the data in each background, objs, etc would be very nice.

I tried to read a bit of the source code this evening but got quickly confused due to the very low level nature of the code.

I'm currently looking at GPU2D_Soft.cpp to understand how I would access the bgs to provide some sort of layered view, however, the code appears very complex
due to the macros to use a different drawing pixel function depending on gpu accel, etc.

In the following code, why is

dst+256

and

dst+512

being written? Is this some sort of double/triple buffering?

void SoftRenderer::DrawPixel_Normal(u32* dst, u16 color, u32 flag)
{
    u8 r = (color & 0x001F) << 1;
    u8 g = (color & 0x03E0) >> 4;
    u8 b = (color & 0x7C00) >> 9;
    //g |= ((color & 0x8000) >> 15);

    *(dst+256) = *dst;
    *dst = r | (g << 8) | (b << 16) | flag;
}

void SoftRenderer::DrawPixel_Accel(u32* dst, u16 color, u32 flag)
{
    u8 r = (color & 0x001F) << 1;
    u8 g = (color & 0x03E0) >> 4;
    u8 b = (color & 0x7C00) >> 9;

    *(dst+512) = *(dst+256);
    *(dst+256) = *dst;
    *dst = r | (g << 8) | (b << 16) | flag;
}

Main - Development - [DISCUSSION] Debug menu for Listing backgrounds, objs, etc

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