mirror of https://github.com/nmlgc/ReC98.git
73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
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// C++ RAII EGC implementation
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// ---------------------------
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// EGC wrapper that automatically disables the EGC if the object goes out of
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// scope.
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struct EGCCopy {
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EGCCopy();
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~EGCCopy();
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// Rectangular blitting
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// --------------------
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// All of these assume that the given rectangles lie fully within VRAM.
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// The inter-page functions return with ![src_page] as the accessed page.
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// Blits the ([w]×[h}) rectangle starting at ([src_left], [src_top]) to
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// ([dst_left], [dst_top]) on the current VRAM page.
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void rect(
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screen_x_t src_left,
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vram_y_t src_top,
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screen_x_t dst_left,
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vram_y_t dst_top,
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pixel_t w,
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pixel_t h
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);
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// Blits the ([w]×[h}) rectangle starting at ([src_left], [src_top]) on
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// VRAM page [src_page] to ([dst_left], [dst_top]) on the other VRAM page.
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void rect_interpage(
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screen_x_t src_left,
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vram_y_t src_top,
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screen_x_t dst_left,
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vram_y_t dst_top,
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pixel_t w,
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pixel_t h,
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page_t src_page
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);
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// Blits the ([w]×[h}) rectangle starting at ([left], [top]) on VRAM page
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// [src_page] to the same position on the other VRAM page.
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void rect_interpage(
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screen_x_t left, vram_y_t top, pixel_t w, pixel_t h, page_t src_page
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);
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// ------------------
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};
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// Internal EGC implementation macros
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// ----------------------------------
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inline void graph_mode_change(bool enable_or_disable) {
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_outportb_(0x6A, (0x06 + enable_or_disable));
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}
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// Requires graphics mode changing to be enabled via
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// graph_mode_change(true).
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inline void graph_mode_egc(bool enable_or_disable) {
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_outportb_(0x6A, (0x04 + enable_or_disable));
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}
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inline void graph_egc(bool enable_or_disable) {
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graph_mode_change(true);
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graph_mode_egc(enable_or_disable);
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graph_mode_change(false);
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}
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inline void graph_egc_on(void) {
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graph_egc(true);
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}
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inline void graph_egc_off(void) {
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graph_egc(false);
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}
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// ----------------------------------
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