51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
#pragma once
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constexpr inline uint16_t rgb565(uint8_t r, uint8_t g, uint8_t b)
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{
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return ((r >> 3) << 11) | ((g >> 2) << 5) | ((b >> 3) << 0);
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}
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constexpr inline uint16_t grey565(uint8_t i)
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{
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return ((i >> 3) << 11) | ((i >> 2) << 5) | ((i >> 3) << 0);
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}
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constexpr inline uint16_t argb4444(uint8_t i)
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{
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return (i << 12) | (15 << 8) | (15 << 4) | (15 << 0);
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}
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template <int C>
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void palette_data();
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template <>
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void palette_data<256>()
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{
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holly.PAL_RAM_CTRL = pal_ram_ctrl::pixel_format::rgb565;
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// ranging in intensity from rgb565(0, 0, 0) to rgb565(31, 63, 31)
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for (int i = 0; i < 256; i += 1) {
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holly.PALETTE_RAM[i] = grey565(i);
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}
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}
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template <>
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void palette_data<16>()
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{
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holly.PAL_RAM_CTRL = pal_ram_ctrl::pixel_format::argb4444;
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// ranging in intensity from rgb565(0, 0, 0) to rgb565(31, 63, 31)
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for (uint32_t i = 0; i < 16; i++) {
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holly.PALETTE_RAM[i] = argb4444(i);
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}
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}
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template <>
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void palette_data<2>()
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{
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holly.PAL_RAM_CTRL = pal_ram_ctrl::pixel_format::argb1555;
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holly.PALETTE_RAM[0] = 0x0000;
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holly.PALETTE_RAM[1] = 0xffff;
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}
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