54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
#include <gint/display.h>
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#ifdef GINT_USER_VRAM
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/* We want to put the VRAM in the user section, however we can't use the
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virtualized P0 address as this will mess up the DMA. As the static RAM is
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always fully mapped at a fixed place, we can use the target P1 address. We
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just need to allocate the space for the linker. This special section ensures
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that the first address of the user stack will be used */
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GALIGNED(4) GSECTION(".bss.vram") int8_t _gint_vram_buffers[396*224*2];
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/* In this case, we can define pointers to our user stack directly, these will
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be the physical address associated with _vram_buffers */
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static uint16_t *main = (void *)0xac161400;
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static uint16_t *scnd = (void *)0xac18c900;
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/* Shared VRAM pointer, the one exposed by <gint/display.h> */
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uint16_t *gint_vram = (void *)0xac161400;
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#else
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/* Otherwise, just put both VRAMs in the system stack! */
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static uint16_t *main = (void *)0xac0f0000;
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static uint16_t *scnd = (void *)0xac11b500;
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uint16_t *gint_vram = (void *)0xac0f0000;
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#endif
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/* On Prizm: should be: 0xa80f0000 and 0xa811b500 */
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/* dsetvram() - Control video RAM address and triple buffering */
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void dsetvram(uint16_t *new_main, uint16_t *new_secondary)
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{
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if(gint_vram == main) gint_vram = new_main;
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else if(gint_vram == scnd) gint_vram = new_secondary;
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main = new_main;
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scnd = new_secondary;
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}
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/* dgetvram() - Get VRAM addresses */
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void dgetvram(uint16_t **ptr_main, uint16_t **ptr_scnd)
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{
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if(ptr_main) *ptr_main = main;
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if(ptr_scnd) *ptr_scnd = scnd;
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}
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/* dvram_switch() - Triple buffering switch
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This function is not public, it is used only by dupdate(). */
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void dvram_switch(void)
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{
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if(gint_vram == main) gint_vram = scnd;
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else gint_vram = main;
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}
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