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