From deb9c48fbd3dc5854de4ae3a04dc999029c10ae0 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sat, 22 Apr 2023 21:12:14 +0200
Subject: Add new renderer and prepare for render overhaul

---
 src/text/text.h | 115 +++++++++++++++++++++++---------------------------------
 1 file changed, 48 insertions(+), 67 deletions(-)

(limited to 'src/text/text.h')

diff --git a/src/text/text.h b/src/text/text.h
index 0bcf090..ab525d4 100644
--- a/src/text/text.h
+++ b/src/text/text.h
@@ -2,10 +2,8 @@
 #define TEXT_H
 
 #include "posprintf.h"
-#include "renderer.h"
-
-#include "font.h"
 
+typedef void (*TxtDrawc)(char c, size_t x, size_t y, u8 clr);
 typedef struct TextEngine {
     // Cursor for tiled text mode The X and Y positions correspond to the tile
     // X and Y starting from the top left of the screen. For a 240x160 screen,
@@ -13,14 +11,10 @@ typedef struct TextEngine {
     size_t cursor_x;
     size_t cursor_y;
 
-    // Memory location of font tile data and tilemap. Likely located on the
-    // VRAM.
-    u32 *font_data;
-    u16 *font_tilemap;
-
-    // The font map for tiled text. Writing the character stored in this
-    // position on the tilemap will show a character on the screen.
-    u16 font_map[256];
+    u8 buffer[30 * 20];
+    u8 spacing;
+    u8 color;
+    TxtDrawc drawc;
 } TextEngine;
 
 static TextEngine text_engine = {0};
@@ -28,20 +22,11 @@ static TextEngine text_engine = {0};
 // Initializes the text engine.
 static inline
 void
-txt_init(u32 *font_data, u16 *font_tilemap, u16 font_offset) {
-    // Load font data into VRAM.
-    unpack_tiles(&font, font_data, 256);
-
-    // Initialize the font map translation table. That way we can write
-    // a character on the text background layer with:
-    //     FONT_TILEMAP[tile_x + 32 * tile_y] = font_map['A'];
-    for (size_t i = 0; i < 256; ++i) {
-        text_engine.font_map[i] = font_offset + i;
-    }
-
+txt_init(TxtDrawc drawc) {
     // Initialize remaining variables.
-    text_engine.font_data = font_data;
-    text_engine.font_tilemap = font_tilemap;
+    text_engine.spacing = 8;
+    text_engine.color = 1;
+    text_engine.drawc = drawc;
 }
 
 // Writes a message to the tile text background.
@@ -59,7 +44,7 @@ txt_puts(char *msg) {
         } else {
             int x = text_engine.cursor_x;
             int y = text_engine.cursor_y;
-            text_engine.font_tilemap[x + 32 * y] = text_engine.font_map[(u16)c];
+            text_engine.buffer[x + 30 * y] = c;
             text_engine.cursor_x += 1;
             if (text_engine.cursor_x >= 30) {
                 text_engine.cursor_x = 0;
@@ -76,18 +61,15 @@ txt_puts(char *msg) {
 static inline
 void
 txt_clear_line(void) {
-    for (size_t i = 0; i < 30; ++i) {
-        int x = text_engine.cursor_x;
-        int y = text_engine.cursor_y;
-        text_engine.font_tilemap[x + 32 * y] = text_engine.font_map[0];
-    }
+    dma_fill(text_engine.buffer, 0, sizeof(text_engine.buffer), 3);
     text_engine.cursor_x = 0;
+    text_engine.cursor_y = 0;
 }
 
 // Clears the screen on the tile text mode.
 static inline
 void
-txt_clear_screen(void) {
+txt_clear(void) {
     for (size_t j = 0; j < 20; ++j) {
         text_engine.cursor_y = j;
         txt_clear_line();
@@ -104,30 +86,49 @@ txt_position(size_t tile_x, size_t tile_y) {
     text_engine.cursor_y = tile_y;
 }
 
+static inline
+void
+txt_color(u8 clr) {
+    text_engine.color = clr;
+}
+
+static inline
+void
+txt_spacing(u8 spacing) {
+    text_engine.spacing = spacing;
+}
+
+// Renders the contents of the scrollback buffer to the screen.
+void
+txt_render(void) {
+    for (size_t y = 0; y < 20; y++) {
+        for (size_t x = 0; x < 30; x++) {
+            size_t pos = x + y * 30;
+            if (text_engine.buffer[pos] == 0) {
+                continue;
+            }
+            text_engine.drawc(
+                    text_engine.buffer[pos],
+                    x * text_engine.spacing,
+                    y * text_engine.spacing,
+                    text_engine.color);
+        }
+    }
+}
+
 // Draws a message where the first character's top-left corner begins at the
 // given x and y position. The character spacing can be adjusted, but beware of
 // color merging issues.
 static inline
 void
-txt_draws(char *msg, size_t x, size_t y, size_t spacing, u8 clr) {
+txt_draws(char *msg, size_t x, size_t y, u8 clr) {
+    size_t i = 0;
     while (*msg) {
         char c = *msg++;
-        Tile *tile = FONT_DATA;
-        tile += c;
-        draw_tile(x, y, tile, clr, true);
-        x += spacing;
+        text_engine.drawc(c, x + i++ * text_engine.spacing, y, clr);
     }
 }
 
-static inline
-void
-txt_drawc(char c, size_t x, size_t y, size_t spacing, u8 clr) {
-    Tile *tile = FONT_DATA;
-    tile += c;
-    draw_tile(x, y, tile, clr, true);
-    x += spacing;
-}
-
 // Print text to the screen with formatting.
 #define txt_printf(msg, ...) \
 	{ \
@@ -138,31 +139,11 @@ txt_drawc(char c, size_t x, size_t y, size_t spacing, u8 clr) {
 
 // Draws text to the screen with formatting starting on the x and y position and
 // with custom character spacing.
-#define txt_drawf(msg, x, y, s, c, ...) \
-	{ \
-		char buf[256] = {0}; \
-		posprintf(buf, msg, ##__VA_ARGS__); \
-		txt_draws(buf, x, y, s, c); \
-	}
-
-// Small font is located after the initial ASCII characters, and only supports
-// lowercase characters.
-// NOTE: Slow, we should do this with a LUT.
-#define txt_drawf_small(msg, x, y, s, c, ...) \
+#define txt_drawf(msg, x, y, c, ...) \
 	{ \
 		char buf[256] = {0}; \
 		posprintf(buf, msg, ##__VA_ARGS__); \
-		for (size_t i = 0; i < 256; i++) { \
-		    if (buf[i] == 0) { \
-		        break; \
-		    } \
-		    if (buf[i] < 'a') { \
-                buf[i] += 16 * 6; \
-		    } else { \
-                buf[i] += 16 * 4; \
-		    }\
-		} \
-		txt_draws(buf, x, y, s, c); \
+		txt_draws(buf, x, y, c); \
 	}
 
 #endif // TEXT_H
-- 
cgit v1.2.1