draw.c

/* KallistiOS ##version##

   draw.c
   Copyright (C) 2002 Megan Potter

   Adapted from Kosh, Copyright (C) 2000 Jordan DeLong

*/

#include <assert.h>
#include <dc/pvr.h>
#include <dc/biosfont.h>
#include "conio.h"

/* the font texture */
static pvr_ptr_t font_texture = NULL;

/* initialize draw stuff: get our texture of the font, etc */
void conio_draw_init(void) {
	uint16 *vram;
	int x, y;

	font_texture = pvr_mem_malloc(256*256*2);
	vram = (uint16 *)font_texture;

	for (y = 0; y < 8; y++) {
		for (x = 0; x < 16; x++) {
			bfont_draw(vram, 256, 0, y*16 + x);
			vram += 16;
		}
		vram += 23*256;
	}
}

void conio_draw_shutdown(void) {
	assert( font_texture != NULL );
	pvr_mem_free(font_texture);
}

/* Draw one font character (6x12) */
static void draw_char(float x1, float y1, float z1, float a, float r,
                      float g, float b, int c) {
	pvr_vertex_t vert;
	int ix, iy;
	float u1, v1, u2, v2;

	if (c == ' ')
		return;

	// assert( c > ' ' && c < 127 );
	if (!( c > ' ' && c < 127 ))
		return;

	ix = (c % 16) * 16;
	iy = (c / 16) * 24;
	u1 = ix * 1.0f / 256.0f;
	v1 = iy * 1.0f / 256.0f;
	u2 = (ix+12) * 1.0f / 256.0f;
	v2 = (iy+24) * 1.0f / 256.0f;

	vert.flags = PVR_CMD_VERTEX;
	vert.x = x1;
	vert.y = y1 + CONIO_FONT_HEIGHT;
	vert.z = z1;
	vert.u = u1;
	vert.v = v2;
	vert.argb = PVR_PACK_COLOR(a, r, g, b);
	vert.oargb = 0;
	pvr_prim(&vert, sizeof(vert));

	vert.x = x1;
	vert.y = y1;
	vert.u = u1;
	vert.v = v1;
	pvr_prim(&vert, sizeof(vert));

	vert.x = x1 + CONIO_FONT_WIDTH;
	vert.y = y1 + CONIO_FONT_HEIGHT;
	vert.u = u2;
	vert.v = v2;
	pvr_prim(&vert, sizeof(vert));

	vert.flags = PVR_CMD_VERTEX_EOL;
	vert.x = x1 + CONIO_FONT_WIDTH;
	vert.y = y1;
	vert.u = u2;
	vert.v = v1;
	pvr_prim(&vert, sizeof(vert));
}

/* draw len chars at string */
static void draw_string(float x, float y, float z, float a, float r, float g,
		float b, char *str, int len) {
	int i;
	pvr_poly_cxt_t	cxt;
	pvr_poly_hdr_t	poly;

	pvr_poly_cxt_txr(&cxt, PVR_LIST_TR_POLY, PVR_TXRFMT_ARGB1555 | PVR_TXRFMT_NONTWIDDLED,
		256, 256, font_texture, PVR_FILTER_NONE);
	pvr_poly_compile(&poly, &cxt);
	pvr_prim(&poly, sizeof(poly));

	for (i = 0; i < len; i++) {
		draw_char(x, y, z, a, r, g, b, str[i]);
		x += CONIO_FONT_WIDTH;
	}
}

/* draw a box (used by cursor and border, etc) (at 1.0f z coord) */
static void draw_box(float x, float y, float w, float h, float a, float r, float g, float b) {
	pvr_poly_cxt_t	cxt;
	pvr_poly_hdr_t	poly;
	pvr_vertex_t	vert;

	pvr_poly_cxt_col(&cxt, PVR_LIST_TR_POLY);
	pvr_poly_compile(&poly, &cxt);
	pvr_prim(&poly, sizeof(poly));

	vert.flags = PVR_CMD_VERTEX;
	vert.x = x;
	vert.y = y + h;
	vert.z = 1.0f;
	vert.u = vert.v = 0.0f;
	vert.argb = PVR_PACK_COLOR(a, r, g, b);
	vert.oargb = 0;
	pvr_prim(&vert, sizeof(vert));

	vert.y -= h;
	pvr_prim(&vert, sizeof(vert));

	vert.y += h;
	vert.x += w;
	pvr_prim(&vert, sizeof(vert));

	vert.flags = PVR_CMD_VERTEX_EOL;
	vert.y -= h;
	pvr_prim(&vert, sizeof(vert));
}

/* draw the border around the screen etc */
static void draw_border(float r, float g, float b) {
	draw_box(0, 0, CONIO_SCREEN_FIRSTCOL - 1, CONIO_SCREEN_HEIGHT, 1.0f, r, g, b);
	draw_box(CONIO_SCREEN_LASTCOL, 0, CONIO_SCREEN_WIDTH - CONIO_SCREEN_LASTCOL, CONIO_SCREEN_HEIGHT, 1.0f, r, g, b);
	draw_box(0, 0, CONIO_SCREEN_WIDTH, CONIO_FONT_HEIGHT, 1.0f, r, g, b);
	draw_box(0, CONIO_SCREEN_HEIGHT - CONIO_FONT_HEIGHT, CONIO_SCREEN_WIDTH, CONIO_FONT_HEIGHT, 1.0f, r, g, b);
}

static void draw_middle(float r, float g, float b) {
	draw_box(CONIO_SCREEN_FIRSTCOL, CONIO_FONT_HEIGHT, CONIO_FONT_WIDTH * CONIO_NUM_COLS, CONIO_FONT_HEIGHT * CONIO_NUM_ROWS, 1.0f, r, g, b);
}

/* draw the virtual screen */
static void draw_virtscr(float a, float r, float g, float b) {
	int i;

	for (i = 0; i < CONIO_NUM_ROWS; i++) {
		draw_string(CONIO_SCREEN_FIRSTCOL, (i + 1) * CONIO_FONT_HEIGHT, 1.0f, a, r, g, b,
			conio_virtscr[i], CONIO_NUM_COLS);
	}
}

/* draw the cursor */
static float c_alpha = 1.0f, c_dalpha = -0.1f;
static void draw_cursor(float r, float g, float b) {
	/* modify our alpha to give a little fading effect */
	c_alpha += c_dalpha;
	if (c_alpha >= 1.0f || c_alpha <= 0.0f)
		c_dalpha = -c_dalpha;

	if (c_alpha > 0.5f) {
		draw_box(conio_cursor.col * CONIO_FONT_WIDTH + CONIO_SCREEN_FIRSTCOL, (conio_cursor.row + 1) * CONIO_FONT_HEIGHT,
			CONIO_FONT_WIDTH, CONIO_FONT_HEIGHT,
			1.0f, r, g, b);
	}
}

/* our exported drawing function: does a full redraw of everything */
void conio_draw_frame(void) {
	pvr_wait_ready();
	pvr_scene_begin();
	pvr_list_begin(PVR_LIST_TR_POLY);
	switch (conio_theme) {
		case CONIO_THEME_C64:
			draw_border(0.4f, 0.6f, 0.98f);
			draw_middle(0.0f, 0.0f, 1.0f);
			draw_virtscr(1.0f, 1.0f, 1.0f, 1.0f);
			draw_cursor(0.4f, 0.6f, 0.98f);
			break;
		case CONIO_THEME_MATRIX:
			draw_virtscr(1.0f, 0.0f, 1.0f, 0.0f);
			draw_cursor(0.0f, 0.7f, 0.0f);
			break;
		case CONIO_THEME_PLAIN:
		default:
			draw_virtscr(1.0f, 1.0f, 1.0f, 1.0f);
			draw_cursor(1.0f, 1.0f, 1.0f);
			break;
	}
	pvr_list_finish();
	pvr_scene_finish();
}