My first commit in this project, just a lame plasma test effect and my tinyfps with...

[dosdemo] / src / plasma.c

diff --git a/src/plasma.c b/src/plasma.c
new file mode 100644 (file)
index 0000000..ac13e6a
--- /dev/null
+++ b/src/plasma.c
@@ -0,0 +1,122 @@
+// Just a test with a run of the mill plasma
+
+#include <stdlib.h>
+#include <math.h>
+
+#include "demo.h"
+#include "screen.h"
+#include "tinyfps.h"
+
+static int init(void);
+static void destroy(void);
+static void start(long trans_time);
+static void stop(long trans_time);
+static void draw(void);
+
+static struct screen scr = {
+       "plasma",
+       init,
+       destroy,
+       start,
+       stop,
+       draw
+};
+
+unsigned long startingTime;
+
+#define PSIN_SIZE 4096
+#define PPAL_SIZE 256
+
+unsigned char *psin1, *psin2, *psin3;
+unsigned short *plasmaPal;
+
+unsigned short myBuffer[320*240];
+
+
+struct screen *plasma_screen(void)
+{
+       return &scr;
+}
+
+static int init(void)
+{
+       int i;
+
+       initFpsFonts();
+
+       psin1 = (unsigned char*)malloc(sizeof(unsigned char) * PSIN_SIZE);
+       psin2 = (unsigned char*)malloc(sizeof(unsigned char) * PSIN_SIZE);
+       psin3 = (unsigned char*)malloc(sizeof(unsigned char) * PSIN_SIZE);
+
+       for (i = 0; i < PSIN_SIZE; i++)
+       {
+               psin1[i] = (unsigned char)(sin((double)i / 45.0) * 63.0 + 63.0);
+               psin2[i] = (unsigned char)(sin((double)i / 75.0) * 42.0 + 42.0);
+               psin3[i] = (unsigned char)(sin((double)i / 32.0) * 88.0 + 88.0);
+       }
+
+       plasmaPal = (unsigned short*)malloc(sizeof(unsigned short) * PPAL_SIZE);
+       for (i=0; i<PPAL_SIZE; i++)
+       {
+               int r, g, b;
+               int c = i;
+               if (c > 127) c = 255 - c;
+               c >>= 2;
+               g = 31 - c;
+               r = c;
+               b = g;
+               plasmaPal[i] = (r<<11) | (g<<5) | b;
+       }
+
+       return 0xCAFE;
+       //return 0;
+}
+
+static void destroy(void)
+{
+       free(psin1);
+       free(psin2);
+       free(psin3);
+}
+
+static void start(long trans_time)
+{
+       startingTime = time_msec;
+}
+
+static void stop(long trans_time)
+{
+}
+
+static void draw(void)
+{
+       int x, y;
+       unsigned char c;
+       unsigned char s1, s2;
+
+       float dt = (float)(time_msec - startingTime) / 1000.0f;
+       int t1 = sin(0.1f * dt) * 132 + 132;
+       int t2 = sin(0.2f * dt) * 248 + 248;
+       int t3 = sin(0.5f * dt) * 380 + 380;
+
+       unsigned int *vram32 = (unsigned int*)vmem_back;
+       unsigned int p0, p1;
+       for (y = 0; y < fb_height; y++)
+       {
+               s1 = psin2[y + t2];
+               s2 = psin3[y + t1];
+               for (x = 0; x < fb_width; x+=2)
+               {
+                       c = psin1[x + t1] + s1 + psin3[x + y + t3] + psin1[psin2[x + t2] + s2 + t3];
+                       p0 = plasmaPal[c];
+                       c = psin1[x + 1 + t1] + s1 + psin3[x + 1 + y + t3] + psin1[psin2[x + 1 + t2] + s2 + t3];
+                       p1 = plasmaPal[c];
+
+                       *vram32++ = (p1 << 16) | p0;
+               }
+       }
+
+       drawFps((unsigned short*)fb_pixels);
+
+       swap_buffers(0);
+}