mirror of
https://github.com/V2RetroComputing/analog.git
synced 2024-11-26 21:51:07 +00:00
d9be2ed9cd
New autodetect routines for Apple II+, IIe (Platinum), IIgs (ROM03). Timing tweaks to improve compatibility on IIgs and IIe. Corrected text rendering on all supported machines. Initial Super HiRes support (not recommended to use at this time) Monochrome DHGR and HGR support activated with IIgs MONOCOLOR or NEWVID registers. 80 Column mode on IIe and IIgs.
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
#include <pico/stdlib.h>
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#include "vgabuf.h"
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#include "render.h"
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#include "character_rom.h"
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#include "vgaout.h"
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static inline uint_fast8_t __time_critical_func(char_terminal_bits)(uint_fast8_t ch, uint_fast8_t glyph_line) {
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uint_fast8_t bits = character_rom[((uint_fast16_t)ch << 3) | glyph_line];
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if(ch & 0x80) {
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// normal character
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return bits & 0x7f;
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}
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if((bits & 0x80) == 0) {
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// inverse character
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return bits ^ 0x7f;
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} else {
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// flashing character
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return (bits ^ text_flasher_mask) & 0x7f;
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}
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}
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void __time_critical_func(render_videx)() {
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vga_prepare_frame();
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render_border();
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for(int line=0; line < 24; line++) {
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render_videx_line(line);
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}
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render_border();
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}
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void __time_critical_func(render_videx_line)(unsigned int line) {
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const uint8_t *page = (const uint8_t *)videx_memory;
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const uint8_t *line_buf = page + (line * 80);
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for(uint glyph_line=0; glyph_line < 8; glyph_line++) {
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struct vga_scanline *sl = vga_prepare_scanline();
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uint sl_pos = 0;
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// Pad 40 pixels on the left to center horizontally
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_7) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_7) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_3) | ((text_border|THEN_EXTEND_3) << 16); // 8 pixels per word
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for(uint col=0; col < 80; ) {
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// Grab 14 pixels from the next two characters
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uint32_t bits_a = char_terminal_bits(line_buf[col], glyph_line);
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col++;
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uint32_t bits_b = char_terminal_bits(line_buf[col], glyph_line);
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col++;
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uint32_t bits = (bits_a << 7) | bits_b;
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// Translate each pair of bits into a pair of pixels
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for(int i=0; i < 7; i++) {
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uint32_t pixeldata = (bits & 0x2000) ? (text_fore) : (text_back);
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pixeldata |= (bits & 0x1000) ?
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(((uint32_t)text_fore) << 16) :
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(((uint32_t)text_back) << 16);
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bits <<= 2;
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sl->data[sl_pos] = pixeldata;
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sl_pos++;
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}
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}
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// Pad 40 pixels on the left to center horizontally
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_7) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_7) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl->data[sl_pos++] = (text_border|THEN_EXTEND_3) | ((text_border|THEN_EXTEND_3) << 16); // 8 pixels per word
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sl->length = sl_pos;
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sl->repeat_count = 1;
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vga_submit_scanline(sl);
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}
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}
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