wip generator

src/generator.c

@@ -1,19 +1,31 @@
 #include "args.h"
 #include "bmp.h"
+#include "rand.h"
+#include <math.h>
 #include <stdio.h>
 
 #define COLOR_DEPTH 3
 
 parameters global_params;
+float global_fslope;
 
 void generate_line(unsigned short y, unsigned char *data_buffer,
                    unsigned int len) {
   unsigned int i;
   for (i = 0; i < len; i++) {
-    data_buffer[i] = global_params.start[i % 3];
+    data_buffer[i] = rand_uchar(256);
   }
 }
 
+unsigned char pixel_gen(unsigned char depth, unsigned char top_pixel,
+                        unsigned char left_pixel) {
+  float v = fminf(
+      255.0, fmaxf(0.0, (rand_float(2.0) - 1.0) * global_params.var[depth] +
+                            ((float)left_pixel) * global_fslope +
+                            ((float)top_pixel) * (1.0 - global_fslope)));
+  return (unsigned char)v;
+}
+
 void debug_parameters(parameters params) {
   if (!params.quiet) {
     printf("output  %s\n", params.file_path);
@@ -29,7 +41,9 @@ void debug_parameters(parameters params) {
 
 int generate(parameters params) {
   global_params = params;
+  global_fslope = ((float)params.slope) / 255.0;
   debug_parameters(params);
+  set_seed(params.seed);
   bmp_generate(params.width, params.height, COLOR_DEPTH, params.file_path,
                generate_line);
   return 0;

src/rand.c

@@ -5,15 +5,17 @@ float seed;
 void set_seed(unsigned long new_seed) { seed = (float)(new_seed % 1000000); }
 
 float rand(float seed) {
-  float v = powf(fabs(seed), 6. / 7.);
+  float v = powf(seed, 6. / 7.);
   v *= sinf(v) + 1.;
   return v - floorf(v);
 }
 
-unsigned char rand_uchar(unsigned int max) {
+float rand_float(const float max) { return rand(seed++) * max; }
+
+unsigned char rand_uchar(const unsigned int max) {
   return (unsigned char)(rand(seed++) * max);
 }
 
-unsigned short rand_ushort(unsigned int max) {
+unsigned short rand_ushort(const unsigned int max) {
   return (unsigned short)(rand(seed++) * max);
 }

src/rand.h

@@ -2,6 +2,7 @@
 #define RAND_H
 
 void set_seed(unsigned long new_seed);
+float rand_float(const float max);
 unsigned char rand_uchar(unsigned int max);
 unsigned short rand_ushort(unsigned int max);