Added erase area function for lights, with boundaries (which I will also add to rende...

diff --git a/src/bump.c b/src/bump.c
index de38079..84a953b 100644 (file)
--- a/src/bump.c
+++ b/src/bump.c
@@ -159,31 +159,66 @@ static void stop(long trans_time)
 {
 }
 
+static void eraseArea(struct point *p, int width, int height)
+{
+       int x, y;
+       unsigned short *dst;
+
+       int x0 = p->x;
+       int y0 = p->y;
+       int x1 = p->x + width;
+       int y1 = p->y + height;
+
+       int dx, dy;
+
+       if (x0 < 0) x0 = 0;
+       if (y0 < 0) y0 = 0;
+       if (x1 > fb_width) x1 = fb_width;
+       if (y1 > fb_height) y1 = fb_height;
+
+       dx = x1 - x0;
+       //dy = y1 - y0;
+
+       dst = (unsigned short*)lightmap + y0 * fb_width + x0;
+
+       for (y = y0; y < y1; y++)
+       {
+               for (x = x0; x < x1; x++)
+               {
+                       *dst++ = 0;
+               }
+               dst += fb_width - dx;
+       }
+}
 
-static void renderLight(struct point *p, unsigned short *light)
+
+static void renderLight(struct point *p, int width, int height, unsigned short *light)
 {
        // Check for boundaries is missing atm, will add soon
        int x, y;
        unsigned short *dst = (unsigned short*)lightmap + p->y * fb_width + p->x;
-       for (y = 0; y < LIGHT_HEIGHT; y++)
+       for (y = 0; y < height; y++)
        {
-               for (x = 0; x < LIGHT_WIDTH; x++)
+               for (x = 0; x < width; x++)
                {
                        *dst++ |= *light++;
                }
-               dst += fb_width - LIGHT_WIDTH;
+               dst += fb_width - width;
        }
 }
 
+static void eraseLights()
+{
+       eraseArea(&pointR, LIGHT_WIDTH, LIGHT_HEIGHT);
+       eraseArea(&pointG, LIGHT_WIDTH, LIGHT_HEIGHT);
+       eraseArea(&pointB, LIGHT_WIDTH, LIGHT_HEIGHT);
+}
 
 static void renderLights()
 {
-       memset(lightmap, 0, fb_width * fb_height * sizeof(*lightmap));
-       // I will later delete only the regions of lights to speed up
-
-       renderLight(&pointR, lightR);
-       renderLight(&pointG, lightG);
-       renderLight(&pointB, lightB);
+       renderLight(&pointR, LIGHT_WIDTH, LIGHT_HEIGHT, lightR);
+       renderLight(&pointG, LIGHT_WIDTH, LIGHT_HEIGHT, lightG);
+       renderLight(&pointB, LIGHT_WIDTH, LIGHT_HEIGHT, lightB);
 }
 
 static void animateLights()
@@ -194,7 +229,11 @@ static void animateLights()
        center.x = (fb_width >> 1) - (LIGHT_WIDTH / 2);
        center.y = (fb_height >> 1) - (LIGHT_HEIGHT / 2);
 
-       pointR.x = center.x + sin(1.2f * dt) * 64.0f;
+       // This test condition will crash because I also need to add boundaries to renderLight (tomorrow)
+       //pointR.x = center.x + sin(1.2f * dt) * 144.0f;
+       //pointR.y = center.y + sin(0.8f * dt) * 148.0f;
+
+       pointR.x = center.x + sin(1.2f * dt) * 96.0f;
        pointR.y = center.y + sin(0.8f * dt) * 48.0f;
 
        pointG.x = center.x + sin(1.5f * dt) * 56.0f;
@@ -216,6 +255,7 @@ static void renderBump(unsigned short *vram)
 
 static void draw(void)
 {
+       eraseLights();
        animateLights();
        renderLights();
        renderBump((unsigned short*)vmem_back);