64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
#include "vdp2.h"
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#include "vdp1.h"
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#include "vram.hpp"
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void palette_data()
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{
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vdp2.cram.u16[3] = rgb15( 0, 0, 0);
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vdp2.cram.u16[2] = rgb15(10, 10, 10);
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vdp2.cram.u16[1] = rgb15(21, 21, 21);
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vdp2.cram.u16[0] = rgb15(31, 31, 31);
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vdp2.cram.u16[16 + 3] = rgb15( 0, 0, 0);
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vdp2.cram.u16[16 + 2] = rgb15(21, 21, 21);
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vdp2.cram.u16[16 + 1] = rgb15(31, 31, 31);
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vdp2.cram.u16[16 + 0] = 0; // transparent
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}
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static void _2bpp_4bpp_vram_copy(uint32_t * vram, const start_size_t& buf)
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{
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for (uint32_t ix = 0; ix < buf.size / 4; ix += 1) {
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const uint32_t pixels = reinterpret_cast<uint32_t const * const>(buf.start)[ix];
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const uint32_t px0 = pixels >> 16 & 0xffff;
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const uint32_t px1 = pixels >> 0 & 0xffff;
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#define lshift(n) ((7 - n) * 2)
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#define rshift(n) ((7 - n) * 4)
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#define px(p, n) (((p >> lshift(n)) & 0b11) << rshift(n))
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#define p0(n) (px(px0, n))
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#define p1(n) (px(px1, n))
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vram[ix * 2 + 0] = p0(7) | p0(6) | p0(5) | p0(4) | p0(3) | p0(2) | p0(1) | p0(0);
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vram[ix * 2 + 1] = p1(7) | p1(6) | p1(5) | p1(4) | p1(3) | p1(2) | p1(1) | p1(0);
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#undef p1
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#undef p0
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#undef px
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#undef lshift
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#undef rshift
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}
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}
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uint32_t character_pattern_table(const start_size_t& buf, const uint32_t top)
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{
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// round to nearest multiple of 16
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const uint32_t table_size = ((buf.size * 2) + 0x10 - 1) & (-0x10);
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const uint32_t base_address = top - table_size;
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uint32_t * vram = &vdp1.vram.u32[(base_address / 4)];
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_2bpp_4bpp_vram_copy(vram, buf);
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return base_address;
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}
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uint32_t cell_data(const start_size_t& buf, const uint32_t top)
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{
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// round to nearest multiple of 32
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const uint32_t table_size = ((buf.size * 2) + 0x20 - 1) & (-0x20);
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const uint32_t base_address = top - table_size; // in bytes
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uint32_t * vram = &vdp2.vram.u32[(base_address / 4)];
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_2bpp_4bpp_vram_copy(vram, buf);
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return base_address;
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}
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