124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
#include <pico/stdlib.h>
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#include "common/config.h"
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#include "vga/vgabuf.h"
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#include "vga/render.h"
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#include "vga/vgaout.h"
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uint16_t DELAYED_COPY_DATA(lores_dot_pattern)[16] = {
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0x0000,
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0x2222,
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0x1111,
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0x3333,
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0x0888,
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0x2AAA,
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0x1999,
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0x3BBB,
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0x0444,
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0x2666,
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0x1555,
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0x3777,
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0x0CCC,
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0x2EEE,
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0x1DDD,
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0x3FFF,
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};
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uint16_t DELAYED_COPY_DATA(lores_palette)[16] = {
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RGB_BLACK, RGB_MAGENTA, RGB_DBLUE, RGB_HVIOLET,
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RGB_DGREEN, RGB_DGRAY, RGB_HBLUE, RGB_LBLUE,
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RGB_BROWN, RGB_HORANGE, RGB_LGRAY, RGB_PINK,
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RGB_HGREEN, RGB_YELLOW, RGB_AQUA, RGB_WHITE
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};
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static void render_lores_line(bool p2, uint line);
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//#define PAGE2SEL (!(soft_switches & SOFTSW_80STORE) && (soft_switches & SOFTSW_PAGE_2))
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#define PAGE2SEL ((soft_switches & (SOFTSW_80STORE | SOFTSW_PAGE_2)) == SOFTSW_PAGE_2)
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void DELAYED_COPY_CODE(render_lores)() {
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for(uint line=0; line < 24; line++) {
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render_lores_line(PAGE2SEL, line);
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}
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}
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void DELAYED_COPY_CODE(render_mixed_lores)() {
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for(uint line=0; line < 20; line++) {
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render_lores_line(PAGE2SEL, line);
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}
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for(uint line=20; line < 24; line++) {
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if(soft_switches & SOFTSW_80COL) {
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render_text80_line(PAGE2SEL, line);
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} else {
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render_text40_line(PAGE2SEL, line);
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}
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}
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}
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static void DELAYED_COPY_CODE(render_lores_line)(bool p2, uint line) {
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// Construct two scanlines for the two different colored cells at the same time
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struct vga_scanline *sl1 = vga_prepare_scanline();
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struct vga_scanline *sl2 = vga_prepare_scanline();
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uint sl_pos = 0;
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uint i, j;
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uint32_t color1, color2;
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const uint8_t *line_buf = (const uint8_t *)((p2 ? text_p2 : text_p1) + ((line & 0x7) << 7) + (((line >> 3) & 0x3) * 40));
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// Pad 40 pixels on the left to center horizontally
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sl1->data[sl_pos] = (text_border|THEN_EXTEND_31) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl2->data[sl_pos] = (text_border|THEN_EXTEND_31) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl_pos++;
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if((soft_switches & SOFTSW_MONOCHROME) || (mono_palette & 0x8)) {
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for(i = 0; i < 40; i+=2) {
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color1 = lores_dot_pattern[line_buf[i] & 0xf] << 14;
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color2 = lores_dot_pattern[(line_buf[i] >> 4) & 0xf] << 14;
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color1 |= lores_dot_pattern[line_buf[i+1] & 0xf];
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color2 |= lores_dot_pattern[(line_buf[i+1] >> 4) & 0xf];
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for(j = 0; j < 14; j++) {
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uint32_t pixeldata;
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pixeldata = (color1 & 0x8000000) ? (text_fore) : (text_back);
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pixeldata |= (color1 & 0x4000000) ? ((text_fore) << 16) : ((text_back) << 16);
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color1 <<= 2;
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sl1->data[sl_pos] = pixeldata;
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pixeldata = (color2 & 0x8000000) ? (text_fore) : (text_back);
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pixeldata |= (color2 & 0x4000000) ? ((text_fore) << 16) : ((text_back) << 16);
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sl2->data[sl_pos] = pixeldata;
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color2 <<= 2;
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sl_pos++;
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}
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}
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} else {
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for(i = 0; i < 40; i++) {
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color1 = lores_palette[line_buf[i] & 0xf];
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color2 = lores_palette[(line_buf[i] >> 4) & 0xf];
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// Each lores pixel is 7 hires pixels, or 14 VGA pixels wide
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sl1->data[sl_pos] = (color1|THEN_EXTEND_6) | ((color1|THEN_EXTEND_6) << 16);
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sl2->data[sl_pos] = (color2|THEN_EXTEND_6) | ((color2|THEN_EXTEND_6) << 16);
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sl_pos++;
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}
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}
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// Pad 40 pixels on the right to center horizontally
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sl1->data[sl_pos] = (text_border|THEN_EXTEND_31) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl2->data[sl_pos] = (text_border|THEN_EXTEND_31) | ((text_border|THEN_EXTEND_7) << 16); // 16 pixels per word
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sl_pos++;
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sl1->length = sl_pos;
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sl1->repeat_count = 7;
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vga_submit_scanline(sl1);
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sl2->length = sl_pos;
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sl2->repeat_count = 7;
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vga_submit_scanline(sl2);
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}
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