From f22bed18ebb87b87c6b8e9d31b42f4320bdf34d6 Mon Sep 17 00:00:00 2001
From: John Tsiombikas <nuclear@mutantstargoat.com>
Date: Sat, 4 Feb 2017 04:06:41 +0200
Subject: [PATCH] tilesaving etc

---
 tools/tilegen/src/main.c |  101 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 81 insertions(+), 20 deletions(-)

diff --git a/tools/tilegen/src/main.c b/tools/tilegen/src/main.c
index 5468d6c..3d4b316 100644
--- a/tools/tilegen/src/main.c
+++ b/tools/tilegen/src/main.c
@@ -1,7 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <GL/glut.h>
+#include <string.h>
+#include <errno.h>
 #include <assert.h>
+#include <GL/glut.h>
 
 struct vec3 {
 	float x, y, z;
@@ -14,12 +16,16 @@ void set_view_matrix(int eye, float ipd);
 void set_proj_matrix(int eye, float ipd);
 void reshape(int x, int y);
 void keyb(unsigned char key, int x, int y);
+void save_tiles(void);
+int save_tile(const char *fname, unsigned char *pixptr, int xsz, int ysz, int pitch);
 
 static int win_width = 320;
 static int win_height = 640;
+static int grid_cols = 10;
+static int grid_rows = 20;
 static float aspect;
 static int view = 0;
-static float eye_dist = 1.4;
+static float eye_dist = 1.3;
 
 int main(int argc, char **argv)
 {
@@ -50,7 +56,7 @@ void disp(void)
 	set_view_matrix(-1, eye_dist);
 	glTranslatef(0, 0, -1);
 
-	draw_field(10, 20);
+	draw_field(grid_cols, grid_rows);
 
 	glColorMask(0, 1, 1, 0);
 
@@ -58,7 +64,7 @@ void disp(void)
 	set_view_matrix(1, eye_dist);
 	glTranslatef(0, 0, -1);
 
-	draw_field(10, 20);
+	draw_field(grid_cols, grid_rows);
 
 	glColorMask(1, 1, 1, 1);
 
@@ -75,21 +81,10 @@ void draw_field(int xcells, int ycells)
 			draw_tile(j, i, xcells, ycells);
 		}
 	}
-
-	/*
-	glBegin(GL_LINES);
-	glColor3f(1, 0, 0);
-	glVertex2f(-100, 0);
-	glVertex2f(100, 0);
-	glColor3f(0, 1, 0);
-	glVertex2f(0, -100);
-	glVertex2f(0, 100);
-	glEnd();
-	*/
 }
 
 #define DX	0.4
-#define DZ	0.3
+#define DZ	0.35
 
 static struct vec3 tileverts[] = {
 	{-1, -1, 0}, {1, -1, 0}, {1, 1, 0}, {-1, 1, 0},
@@ -97,11 +92,11 @@ static struct vec3 tileverts[] = {
 	{1 - DX, 1 - DX, DZ}, {-1 + DX, 1 - DX, DZ}
 };
 static struct vec3 tilecol[] = {
-	{0.8, 0.8, 0.8},	/* left */
+	{0.5, 0.5, 0.5},	/* left */
 	{0.2, 0.2, 0.2},	/* bottom */
-	{0.4, 0.4, 0.4},	/* right */
-	{1.0, 1.0, 1.0},	/* top */
-	{0.7, 0.7, 0.7},	/* front */
+	{0.5, 0.5, 0.5},	/* right */
+	{0.8, 0.8, 0.8},	/* top */
+	{0.65, 0.65, 0.65},	/* front */
 	{0, 0, 0}, {0, 0, 0}, {0, 0, 0}
 };
 static uint16_t tileidx[] = { /* 3 +---------+ 2 */
@@ -175,5 +170,71 @@ void keyb(unsigned char key, int x, int y)
 		view = key - '2';
 		glutPostRedisplay();
 		break;
+
+	case 's':
+		save_tiles();
+		break;
+
+	case ' ':
+		if(win_height > 160) {
+			glutReshapeWindow(win_width / 4, win_height / 4);
+		} else {
+			glutReshapeWindow(win_width * 4, win_height * 4);
+		}
+		glutPostRedisplay();
+		break;
+	}
+}
+
+
+void save_tiles(void)
+{
+	unsigned char *pixels, *tilepix;
+	int i, j, tilesz = win_height / grid_rows;
+	char fname[256];
+
+	if(!(pixels = malloc(win_width * win_height * 3))) {
+		fprintf(stderr, "failed to allocate pixel buffer\n");
+		return;
 	}
+	glReadPixels(0, 0, win_width, win_height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
+
+	for(i=0; i<grid_rows; i++) {
+		for(j=0; j<grid_cols; j++) {
+			tilepix = pixels + (i * win_width + j) * tilesz * 3;
+
+			sprintf(fname, "tile-%02d%02d.ppm", j, i);
+			save_tile(fname, tilepix, tilesz, tilesz, win_width * 3);
+		}
+	}
+}
+
+int save_tile(const char *fname, unsigned char *pixptr, int xsz, int ysz, int pitch)
+{
+	int i, j;
+	FILE *fp;
+
+	printf("saving tile: %s\n", fname);
+
+	if(!(fp = fopen(fname, "wb"))) {
+		fprintf(stderr, "failed to open %s for writing: %s\n", fname, strerror(errno));
+		return -1;
+	}
+
+	pixptr += ysz * pitch;
+	fprintf(fp, "P6\n%d %d\n255\n", xsz, ysz);
+	for(i=0; i<ysz; i++) {
+		pixptr -= pitch;
+		for(j=0; j<xsz; j++) {
+			int r = pixptr[j * 3];
+			int g = pixptr[j * 3 + 1];
+			int b = pixptr[j * 3 + 2];
+			fputc(r, fp);
+			fputc(g, fp);
+			fputc(b, fp);
+		}
+	}
+
+	fclose(fp);
+	return 0;
 }
-- 
1.7.10.4