Add hello_font example

README.md

@@ -94,7 +94,6 @@ If you want to remove all the files generated by the compilation process, type `
 
   * hello_poly_subdiv (polygon subdivision)
   * hello_rsd (rsd format)
-  * Hello multi XA
 
 # Links and Doc
   

hello_font/Makefile

@@ -0,0 +1,6 @@
+TARGET = hello_font
+
+SRCS = hello_font.c \
+fnt.tim \
+
+include ../common.mk 

hello_font/hello_font.c

@@ -0,0 +1,128 @@
+// Change the debug font face and colors !
+// Schnappy 2020
+#include <sys/types.h>
+#include <stdio.h>
+#include <libgte.h>
+#include <libetc.h>
+#include <libgpu.h>
+#define VMODE 0                 // Video Mode : 0 : NTSC, 1: PAL
+#define SCREENXRES 320          // Screen width
+#define SCREENYRES 240          // Screen height
+#define CENTERX SCREENXRES/2    // Center of screen on x 
+#define CENTERY SCREENYRES/2    // Center of screen on y
+#define MARGINX 96                // margins for text display
+#define MARGINY 64
+#define FONTSIZE 8 * 7           // Text Field Height
+DISPENV disp[2];                 // Double buffered DISPENV and DRAWENV
+DRAWENV draw[2];
+short db = 0;                      // index of which buffer is used, values 0, 1
+#define FONTX   960
+#define FONTY   0
+// Two color vectors R,G,B
+CVECTOR fntColor = { 255, 0, 0 };
+CVECTOR fntColorBG = { 0, 0, 0 };
+
+extern unsigned long _binary_fnt_tim_start[];
+extern unsigned long _binary_fnt_tim_end[];
+extern unsigned long _binary_fnt_tim_length;
+
+// Loading an image to vram. See https://github.com/ABelliqueux/nolibgs_hello_worlds/blob/main/hello_sprt/hello_sprt.c#L42
+TIM_IMAGE fontface;
+void LoadTexture(u_long * tim, TIM_IMAGE * tparam){     
+        OpenTIM(tim);                                   
+        ReadTIM(tparam);                                
+        LoadImage(tparam->prect, tparam->paddr);        
+        DrawSync(0);                                    
+        if (tparam->mode & 0x8){ // check 4th bit       
+            LoadImage(tparam->crect, tparam->caddr);    
+            DrawSync(0);                                
+    }
+}
+
+void FntColor(CVECTOR fgcol, CVECTOR bgcol )
+{
+    // The debug font clut is at tx, ty + 128
+    // tx = bg color
+    // tx + 1 = fg color
+    // We can override the color by drawing a rect at these coordinates
+    // 
+    // Define 1 pixel at 960,128 (background color) and 1 pixel at 961, 128 (foreground color)
+    RECT fg = { FONTX+1, FONTY + 128, 1, 1 };
+    RECT bg = { FONTX, FONTY + 128, 1, 1 };
+    // Set colors
+    ClearImage(&fg, fgcol.r, fgcol.g, fgcol.b);
+    ClearImage(&bg, bgcol.r, bgcol.g, bgcol.b);
+}
+
+void init(void)
+{
+    ResetGraph(0);                 // Initialize drawing engine with a complete reset (0)
+    SetDefDispEnv(&disp[0], 0, 0         , SCREENXRES, SCREENYRES);     // Set display area for both &disp[0] and &disp[1]
+    SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);     // &disp[0] is on top  of &disp[1]
+    SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES);     // Set draw for both &draw[0] and &draw[1]
+    SetDefDrawEnv(&draw[1], 0, 0         , SCREENXRES, SCREENYRES);     // &draw[0] is below &draw[1]
+    if (VMODE)                  // PAL
+    {
+        SetVideoMode(MODE_PAL);
+        disp[0].screen.y += 8;  // add offset : 240 + 8 + 8 = 256
+        disp[1].screen.y += 8;
+        }
+    SetDispMask(1);                 // Display on screen    
+    setRGB0(&draw[0], 50, 50, 50); // set color for first draw area
+    setRGB0(&draw[1], 50, 50, 50); // set color for second draw area
+    draw[0].isbg = 1;               // set mask for draw areas. 1 means repainting the area with the RGB color each frame 
+    draw[1].isbg = 1;
+    PutDispEnv(&disp[db]);          // set the disp and draw environnments
+    PutDrawEnv(&draw[db]);
+    FntLoad(960, 0);                // Load font to vram at 960,0(+128)
+    FntOpen(MARGINX, MARGINY, SCREENXRES, SCREENXRES, 0, 280 ); // FntOpen(x, y, width, height,  black_bg, max. nbr. chars
+
+}
+void display(void)
+{
+    DrawSync(0);                    // Wait for all drawing to terminate
+    VSync(0);                       // Wait for the next vertical blank
+    PutDispEnv(&disp[db]);          // set alternate disp and draw environnments
+    PutDrawEnv(&draw[db]);  
+    db = !db;                       // flip db value (0 or 1)
+}
+int main(void)
+{
+    u_int t = 0;
+    u_short step = 10;
+    u_char * channel, * prevChannel;
+    channel = &fntColor.r;
+    prevChannel = &fntColor.b;
+    init();                         // execute init()
+    LoadTexture(_binary_fnt_tim_start, &fontface);
+    FntColor(fntColor, fntColorBG);
+    while (1)                       // infinite loop
+    {   
+        
+        t++;
+                
+        if (fntColor.r >= 254 - step ){channel = &fntColor.g; prevChannel = &fntColor.r;}
+        if (fntColor.g >= 254 - step ){channel = &fntColor.b; prevChannel = &fntColor.g;}
+        if (fntColor.b >= 254 - step ){channel = &fntColor.r; prevChannel = &fntColor.b;}
+            
+        *channel += step;
+        
+        if (*prevChannel){
+            *prevChannel -= step;
+        }
+        //~ fntColorBG.g = 255 - color ;
+        FntColor(fntColor, fntColorBG);
+        // 4lines, 16 glyphs on each line
+        // Glyphs are 5x7 pixels wide in 16bpp, 
+        FntPrint("!\"#$%%&'()*+,-./\n");
+        FntPrint("0123456789:;<=^?\n");
+        FntPrint("@ABCDEFGHIJKLMNO\n");
+        FntPrint("PQRSTUVWXYZ[\\]>");
+
+        FntPrint("\n\nHELLO DEBUG FONT! %d", t);
+                                             
+        FntFlush(-1);               // Draw print stream
+        display();                  // Execute display()
+    }
+    return 0;
+    }