44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#include <display.h>
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// Program video ram. It resides in .bss section, therefore it is cleared at
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// program initialization and stripped from the executable file.
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static int local_vram[256];
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int *vram = local_vram;
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/*
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display_getLocalVRAM()
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Returns the local video ram address. This function always return the
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same address.
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The buffer returned by this function should not be used directly when
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running the gray engine.
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*/
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inline void *display_getLocalVRAM(void)
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{
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return (void *)local_vram;
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}
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/*
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display_getCurrentVRAM()
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Returns the current video ram. This function usually returns the
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parameter of the last call to display_useVRAM(), unless the gray engine
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is running (in which case the result is undefined). Returns the local
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vram address by default.
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*/
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inline void *display_getCurrentVRAM(void)
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{
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return (void *)vram;
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}
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/*
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display_useVRAM()
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Changes the current video ram address. The argument MUST be a 4-
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aligned 1024-byte buffer ; otherwise any drawing operation will crash
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the program.
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This function will most likely have no effect when running the gray
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engine.
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*/
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inline void display_useVRAM(void *ptr)
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{
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vram = (int *)ptr;
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}
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