POG
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43b9598a16
commit
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1
.gitignore
vendored
1
.gitignore
vendored
@ -1,4 +1,5 @@
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texmap
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*.png
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*.ppm
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*.swp
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wget-log
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91
main.c
91
main.c
@ -2,6 +2,10 @@
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <math.h>
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// You need to generate this with textoc.h
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#include "texture.h"
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typedef uint8_t u8;
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@ -10,32 +14,93 @@ typedef uint8_t u8;
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#define log(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
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#define panic(fmt, ...) { fprintf(stderr, "PANIC: " fmt "\n", ##__VA_ARGS__); exit(EXIT_FAILURE); }
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// A simple designation of a rectangle
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struct rect {
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int x1, y1; // Inclusive
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int x2, y2; // Exclusive
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};
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// Compute the dimensions of a rect
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void rect_dims(struct rect bounds, int * width, int * height) {
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*width = abs(bounds.x2 - bounds.x1);
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*height = abs(bounds.y2 - bounds.y1);
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}
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// A simple designation of a texture
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struct texture {
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int width, height;
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u8 * data;
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};
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// fb is framebuffer. Thsi dumps a color version (rgb) of a framebuffer
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// to stdout, which you can pipe to a file or some shit idk
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void dump_ppm(u8 * fb, int width, int height) {
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log("Dumping framebuffer %dx%d", width, height);
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printf("P3\n%d %d\n%d\n# Image start\n", width, height, CDEPTH);
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for(int i = 0; i < width * height * 3; i+=3)
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printf("%d %d %d\n", fb[i], fb[i+1], fb[i+2]);
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void dump_ppm(struct texture fb) {
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log("Dumping framebuffer %dx%d", fb.width, fb.height);
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printf("P3\n%d %d\n%d\n# Image start\n", fb.width, fb.height, CDEPTH);
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for(int i = 0; i < fb.width * fb.height * 3; i+=3)
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printf("%d %d %d\n", fb.data[i], fb.data[i+1], fb.data[i+2]);
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printf("\n");
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}
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// ------------------------------------------------------
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// * THIS IS THE FUNCTION YOU WANT <3 *
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// ------------------------------------------------------
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void drawTexInto(struct texture tex, struct texture buffer, struct rect texbounds, struct rect bufbounds) {
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int texwidth, texheight, outwidth, outheight;
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rect_dims(texbounds, &texwidth, &texheight);
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rect_dims(bufbounds, &outwidth, &outheight);
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// We precalculate the step through the texture to avoid division and
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// multiplication per pixel
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float stepx = (float)texwidth / outwidth;
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float stepy = (float)texheight / outheight;
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float texx = texbounds.x1;
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float texy = texbounds.y1;
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log("%f,%f step %f,%f", texx, texy, stepx, stepy);
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// Buffer is R G B for each pixel, then across then down. If you want X, Y,
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// it's: 3 * (x + y * width)
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for(int y = bufbounds.y1; y < bufbounds.y2; y++) {
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texx = texbounds.x1;
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for(int x = bufbounds.x1; x < bufbounds.x2; x++) {
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int texi = 3 * (floor(texx) + tex.width * floor(texy));
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int bufi = 3 * (x + buffer.width * y);
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// You can get rid of this for loop for more performance, but probably
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// not a big deal with -O3, it'll be unrolled
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for(int i = 0; i < 3; i++) {
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buffer.data[bufi + i] = tex.data[texi + i];
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}
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texx += stepx;
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}
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texy += stepy;
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}
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}
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int main() {
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log("Program start");
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const int width = 512;
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const int height = 512;
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const int fbsize = width * height * 3 * sizeof(u8);
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const int fbsize = width * height * 3;
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u8 * fb = malloc(fbsize);
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if(!fb) {
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panic("Can't allocate framebuffer");
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}
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memset(fb, 0, fbsize);
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struct texture fb = {
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width, height,
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calloc(fbsize, 1)
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};
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// We actually stretch a texture
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if(!fb.data) panic("Can't allocate framebuffer");
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dump_ppm(fb, width, height);
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// Initialize the texture. It's already defined elsewhere
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struct texture tex = {
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mytex_width, mytex_height, mytex
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};
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// We actually stretch a texture here
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struct rect texrect = { 0, 0, 16, 16 };
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struct rect bufrect = { 100, 100, 502, 192 };
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drawTexInto(tex, fb, texrect, bufrect);
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// Dump the image to the ppm
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dump_ppm(fb);
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log("Program end");
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}
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2
run.sh
2
run.sh
@ -1,5 +1,7 @@
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#!/bin/sh
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# Yeah you need furnace.png lol
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./textoc.sh furnace.png
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./build.sh
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./texmap > image.ppm
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convert image.ppm image.png
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6
textoc.sh
Normal file → Executable file
6
textoc.sh
Normal file → Executable file
@ -2,9 +2,13 @@
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if [ $# -lt 1 ]
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then
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echo "You must pass in the texture!"
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echo "You must pass in the texture! It should be 16x16 lol"
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exit 1
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fi
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convert $1 -compress none $1.ppm
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echo "int mytex_width = 16, mytex_height = 16;\nuint8_t mytex[] = {\n" > texture.h
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cat $1.ppm | sed 1,3d | sed -e 's/ /, /g' >> texture.h
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echo "};" >> texture.h
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20
texture.h
Normal file
20
texture.h
Normal file
@ -0,0 +1,20 @@
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int mytex_width = 16, mytex_height = 16;
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uint8_t mytex[] = {
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197, 197, 197, 171, 172, 171, 143, 143, 143, 143, 143, 143, 104, 104, 104, 116, 116, 116, 104, 104, 104, 116, 116, 116, 104, 104, 104, 116, 116, 116, 116, 116, 116, 104, 104, 104, 197, 197, 197, 171, 172, 171, 143, 143, 143, 143, 143, 143,
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171, 172, 171, 63, 62, 66, 73, 72, 72, 104, 104, 104, 79, 79, 79, 73, 72, 72, 63, 62, 66, 63, 62, 66, 73, 72, 72, 73, 72, 72, 73, 72, 72, 63, 62, 66, 171, 172, 171, 63, 62, 66, 73, 72, 72, 104, 104, 104,
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143, 143, 143, 73, 72, 72, 89, 88, 88, 114, 121, 110, 73, 72, 72, 73, 72, 72, 79, 79, 79, 79, 79, 79, 79, 79, 79, 89, 88, 88, 89, 88, 88, 79, 79, 79, 143, 143, 143, 73, 72, 72, 89, 88, 88, 114, 121, 110,
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116, 116, 116, 114, 121, 110, 114, 121, 110, 136, 135, 136, 63, 62, 66, 73, 72, 72, 73, 72, 72, 73, 72, 72, 63, 62, 66, 63, 62, 66, 79, 79, 79, 79, 79, 79, 116, 116, 116, 114, 121, 110, 114, 121, 110, 136, 135, 136,
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104, 104, 104, 63, 62, 66, 63, 62, 66, 79, 79, 79, 89, 88, 88, 103, 97, 97, 89, 88, 88, 89, 88, 88, 89, 88, 88, 79, 79, 79, 73, 72, 72, 73, 72, 72, 63, 62, 66, 63, 62, 66, 63, 62, 66, 104, 104, 104,
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116, 116, 116, 63, 62, 66, 73, 72, 72, 73, 72, 72, 73, 72, 72, 89, 88, 88, 89, 88, 88, 79, 79, 79, 63, 62, 66, 73, 72, 72, 73, 72, 72, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 116, 116, 116,
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116, 116, 116, 73, 72, 72, 79, 79, 79, 136, 135, 136, 136, 135, 136, 136, 135, 136, 136, 135, 136, 136, 135, 136, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 104, 104, 104, 79, 79, 79, 79, 79, 79, 116, 116, 116,
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104, 104, 104, 79, 79, 79, 79, 79, 79, 136, 135, 136, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 197, 171, 172, 171, 171, 172, 171, 171, 172, 171, 104, 104, 104, 73, 72, 72, 73, 72, 72, 104, 104, 104,
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104, 104, 104, 63, 62, 66, 63, 62, 66, 116, 116, 116, 156, 156, 156, 171, 172, 171, 17, 17, 17, 171, 172, 171, 17, 17, 17, 171, 172, 171, 17, 17, 17, 156, 156, 156, 104, 104, 104, 63, 62, 66, 63, 62, 66, 104, 104, 104,
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143, 143, 143, 181, 181, 181, 197, 197, 197, 156, 156, 156, 104, 104, 104, 171, 172, 171, 17, 17, 17, 171, 172, 171, 17, 17, 17, 171, 172, 171, 17, 17, 17, 156, 156, 156, 89, 88, 88, 181, 181, 181, 181, 181, 181, 143, 143, 143,
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104, 104, 104, 143, 143, 143, 104, 104, 104, 156, 156, 156, 104, 104, 104, 171, 172, 171, 17, 17, 17, 156, 156, 156, 17, 17, 17, 156, 156, 156, 17, 17, 17, 156, 156, 156, 89, 88, 88, 156, 156, 156, 156, 156, 156, 104, 104, 104,
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104, 104, 104, 143, 143, 143, 116, 116, 116, 89, 88, 88, 114, 121, 110, 156, 156, 156, 197, 197, 197, 156, 156, 156, 197, 197, 197, 156, 156, 156, 197, 197, 197, 114, 121, 110, 89, 88, 88, 136, 135, 136, 156, 156, 156, 104, 104, 104,
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104, 104, 104, 143, 143, 143, 136, 135, 136, 73, 72, 72, 114, 121, 110, 114, 121, 110, 114, 121, 110, 114, 121, 110, 114, 121, 110, 114, 121, 110, 114, 121, 110, 114, 121, 110, 73, 72, 72, 143, 143, 143, 136, 135, 136, 104, 104, 104,
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89, 88, 88, 136, 135, 136, 136, 135, 136, 73, 72, 72, 73, 72, 72, 73, 72, 72, 73, 72, 72, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 136, 135, 136, 127, 127, 127, 89, 88, 88,
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89, 88, 88, 127, 127, 127, 136, 135, 136, 127, 127, 127, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 127, 127, 127, 127, 127, 127, 127, 127, 127, 89, 88, 88,
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89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88, 89, 88, 88,
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};
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