2020-09-19 17:18:59 +00:00
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// Darkens the [w]×[h] area starting at [vram_offset], by writing an
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// alternating dot pattern in the given [col]. [x] and [y] store the currently
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// iterated position.
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#define darken(vram_offset, x, y, w, h, col) \
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grcg_setcolor(GC_RMW, 1); \
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dots32_t pattern = 0xAAAAAAAA; \
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\
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y = 0; \
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while(y < h) { \
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pattern = ((y & 1) == 0) ? 0xAAAAAAAA : 0x55555555; \
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\
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x = 0; \
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while(x < (w / BYTE_DOTS)) { \
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2020-09-25 19:21:56 +00:00
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grcg_put(vram_offset, pattern, 32); \
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2020-09-19 17:18:59 +00:00
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x += static_cast<vram_byte_amount_t>(sizeof(pattern)); \
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vram_offset += static_cast<vram_offset_t>(sizeof(pattern)); \
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} \
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y++; \
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vram_offset += (ROW_SIZE - (w / BYTE_DOTS)); \
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} \
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grcg_off();
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