mirror of
https://git.coom.tech/drummyfish/small3dlib.git
synced 2024-11-24 21:09:57 +01:00
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/*
|
|
Example program for small3dlib, testing a high-poly offline model.
|
|
|
|
author: Miloslav Ciz
|
|
license: CC0 1.0
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#define S3L_STRICT_NEAR_CULLING 0
|
|
|
|
#if TEXTURES
|
|
#define S3L_PERSPECTIVE_CORRECTION 2
|
|
#else
|
|
#define S3L_PERSPECTIVE_CORRECTION 0
|
|
#endif
|
|
|
|
#define S3L_NEAR (S3L_FRACTIONS_PER_UNIT / 5)
|
|
|
|
#define S3L_Z_BUFFER 1
|
|
|
|
#define S3L_PIXEL_FUNCTION drawPixel
|
|
|
|
#define S3L_RESOLUTION_X 800
|
|
#define S3L_RESOLUTION_Y 600
|
|
|
|
#include "../small3dlib.h"
|
|
|
|
#include "alligatorModel.h"
|
|
|
|
S3L_Unit normals[ALLIGATOR_VERTEX_COUNT * 3];
|
|
|
|
uint8_t frameBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y * 3];
|
|
|
|
S3L_Scene scene;
|
|
|
|
S3L_Vec4 teleportPoint;
|
|
|
|
uint32_t pixels[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
|
|
|
|
void clearScreen()
|
|
{
|
|
memset(frameBuffer,255,S3L_RESOLUTION_X * S3L_RESOLUTION_Y * 3 * sizeof(uint8_t));
|
|
}
|
|
|
|
void saveImage(char *fileName)
|
|
{
|
|
printf("saving image file: %s\n",fileName);
|
|
|
|
FILE *f = fopen(fileName,"w");
|
|
|
|
fprintf(f,"P3\n%d %d\n255\n",S3L_RESOLUTION_X,S3L_RESOLUTION_Y);
|
|
|
|
for (int i = 0; i < S3L_RESOLUTION_X * S3L_RESOLUTION_Y * 3; i += 3)
|
|
fprintf(f,"%d %d %d\n",frameBuffer[i],frameBuffer[i + 1],frameBuffer[i + 2]);
|
|
|
|
fclose(f);
|
|
}
|
|
|
|
uint32_t previousTriangle = 1000;
|
|
S3L_Vec4 n0, n1, n2, toLight;
|
|
|
|
void drawPixel(S3L_PixelInfo *p)
|
|
{
|
|
if (p->triangleID != previousTriangle)
|
|
{
|
|
S3L_getIndexedTriangleValues(
|
|
p->triangleIndex,
|
|
scene.models[p->modelIndex].triangles,
|
|
normals,3,&n0,&n1,&n2);
|
|
|
|
previousTriangle = p->triangleID;
|
|
}
|
|
|
|
S3L_Vec4 normal;
|
|
|
|
normal.x = S3L_interpolateBarycentric(n0.x,n1.x,n2.x,p->barycentric);
|
|
normal.y = S3L_interpolateBarycentric(n0.y,n1.y,n2.y,p->barycentric);
|
|
normal.z = S3L_interpolateBarycentric(n0.z,n1.z,n2.z,p->barycentric);
|
|
|
|
S3L_normalizeVec3(&normal);
|
|
|
|
S3L_Unit shading =
|
|
(S3L_dotProductVec3(normal,toLight) + S3L_FRACTIONS_PER_UNIT) / 2;
|
|
|
|
shading = S3L_interpolate(shading,0,p->depth,32 * S3L_FRACTIONS_PER_UNIT);
|
|
|
|
int index = (p->y * S3L_RESOLUTION_X + p->x) * 3;
|
|
|
|
frameBuffer[index] = S3L_clamp(S3L_interpolateByUnitFrom0(200,shading),0,255);
|
|
frameBuffer[index + 1] = S3L_clamp(S3L_interpolateByUnitFrom0(255,shading),0,255);
|
|
frameBuffer[index + 2] = S3L_clamp(S3L_interpolateByUnitFrom0(150,shading),0,255);
|
|
}
|
|
|
|
int main()
|
|
{
|
|
S3L_setVec4(&toLight,10,-10,-10,0);
|
|
|
|
S3L_normalizeVec3(&toLight);
|
|
|
|
alligatorModelInit();
|
|
|
|
S3L_computeModelNormals(alligatorModel,normals,0);
|
|
|
|
S3L_initScene(&alligatorModel,1,&scene);
|
|
|
|
scene.camera.transform.translation.z = -8 * S3L_FRACTIONS_PER_UNIT;
|
|
scene.camera.transform.translation.x = 9 * S3L_FRACTIONS_PER_UNIT;
|
|
scene.camera.transform.translation.y = 6 * S3L_FRACTIONS_PER_UNIT;
|
|
|
|
S3L_lookAt(scene.models[0].transform.translation,&(scene.camera.transform));
|
|
|
|
clearScreen();
|
|
S3L_newFrame();
|
|
S3L_drawScene(scene);
|
|
|
|
saveImage("allligator.ppm");
|
|
|
|
return 0;
|
|
}
|