572fade7ff
This is mostly cleanup after fighting the double buffering bug - bring back rep stosl for screen fill, and move draw_pixel to be an inline function.
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#include <stdlib.h>
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#include <string.h>
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#include "screen.h"
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screen::screen(volatile void *addr, unsigned hres, unsigned vres, unsigned scanline, pixel_order order) :
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m_fb(static_cast<volatile pixel_t *>(addr)),
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m_order(order),
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m_scanline(scanline),
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m_resx(hres),
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m_resy(vres)
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{
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const size_t size = scanline * vres;
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m_back = reinterpret_cast<pixel_t*>(malloc(size * sizeof(pixel_t)));
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}
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screen::pixel_t
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screen::color(uint8_t r, uint8_t g, uint8_t b) const
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{
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switch (m_order) {
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case pixel_order::bgr8:
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return
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(static_cast<uint32_t>(b) << 0) |
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(static_cast<uint32_t>(g) << 8) |
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(static_cast<uint32_t>(r) << 16);
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case pixel_order::rgb8:
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return
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(static_cast<uint32_t>(r) << 0) |
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(static_cast<uint32_t>(g) << 8) |
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(static_cast<uint32_t>(b) << 16);
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}
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}
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void
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screen::fill(pixel_t color)
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{
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const size_t len = m_scanline * m_resy;
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asm volatile ( "rep stosl" : :
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"a"(color), "c"(len), "D"(m_back) );
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}
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void
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screen::update()
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{
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const size_t len = m_scanline * m_resy * sizeof(pixel_t);
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asm volatile ( "rep movsb" : :
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"c"(len), "S"(m_back), "D"(m_fb) );
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}
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