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https://git.coom.tech/drummyfish/small3dlib.git
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268 lines
6.4 KiB
C
268 lines
6.4 KiB
C
#define S3L_RESOLUTION_X 1280
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#define S3L_RESOLUTION_Y 1024
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#define S3L_PIXEL_FUNCTION drawPixel
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#define S3L_PERSPECTIVE_CORRECTION 1
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#define S3L_SORT 0
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#define S3L_Z_BUFFER 1
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#include "../small3dlib.h"
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#include <stdio.h>
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#include <math.h>
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uint8_t frameBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y * 3];
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#define GRID_W 16
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#define GRID_H 16
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int8_t heightMap[GRID_W * GRID_H] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,1,0,0,1,1,1,0,0,0,0,0,
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0,0,0,0,0,1,0,1,3,3,1,1,0,0,0,0,
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0,0,0,1,1,1,1,3,3,4,2,1,1,0,0,0,
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0,0,0,0,1,1,3,4,4,6,5,2,1,1,0,0,
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0,0,1,2,2,3,4,4,4,6,6,4,3,1,0,0,
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0,1,2,4,5,5,6,6,6,6,6,5,5,3,1,0,
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0,0,2,4,6,7,8,7,7,6,6,6,6,6,2,0,
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0,0,3,4,7,8,8,9,8,7,6,6,6,6,2,0,
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0,0,0,2,4,7,7,7,7,6,6,6,4,3,0,0,
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0,0,0,1,3,6,6,6,6,6,6,6,2,0,0,0,
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0,0,0,0,3,6,6,6,6,6,6,2,0,0,0,0,
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0,0,0,1,1,2,3,5,5,5,2,0,0,0,0,0,
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0,0,1,2,0,0,2,4,4,2,2,0,0,0,0,0,
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0,0,0,0,0,0,1,3,3,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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};
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#define GRID_TRIANGLES ((GRID_W - 1) * (GRID_H - 1) * 2)
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S3L_Unit terrainVertices[GRID_W * GRID_H * 3];
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S3L_Unit terrainNormals[GRID_W * GRID_H * 3];
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S3L_Unit waterVertices[GRID_W * GRID_H * 3];
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S3L_Unit waterNormals[GRID_W * GRID_H * 3];
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S3L_Index gridTriangles[GRID_TRIANGLES * 3];
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#define MODELS 2
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S3L_Model3D models[MODELS];
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S3L_Scene scene;
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int previousTriangle = -1;
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S3L_Vec4 lightDirection;
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S3L_Vec4 n0, n1, n2;
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void drawPixel(S3L_PixelInfo *p)
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{
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S3L_Unit *normals = p->modelIndex == 0 ? terrainNormals : waterNormals;
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if (p->triangleIndex != previousTriangle)
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{
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int index = scene.models[p->modelIndex].triangles[p->triangleIndex * 3] * 3;
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n0.x = normals[index];
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index++;
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n0.y = normals[index];
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index++;
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n0.z = normals[index];
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index = scene.models[p->modelIndex].triangles[p->triangleIndex * 3 + 1] * 3;
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n1.x = normals[index];
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index++;
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n1.y = normals[index];
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index++;
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n1.z = normals[index];
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index = scene.models[p->modelIndex].triangles[p->triangleIndex * 3 + 2] * 3;
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n2.x = normals[index];
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index++;
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n2.y = normals[index];
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index++;
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n2.z = normals[index];
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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,
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p->barycentric[0], p->barycentric[1], p->barycentric[2]);
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normal.y = S3L_interpolateBarycentric(n0.y, n1.y, n2.y,
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p->barycentric[0], p->barycentric[1], p->barycentric[2]);
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normal.z = S3L_interpolateBarycentric(n0.z, n1.z, n2.z,
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p->barycentric[0], p->barycentric[1], p->barycentric[2]);
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S3L_normalizeVec3(&normal);
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uint8_t light = 127 - 127 * (S3L_dotProductVec3(lightDirection,normal) / ((float) S3L_FRACTIONS_PER_UNIT));
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uint8_t color[3];
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int index = (p->y * S3L_RESOLUTION_X + p->x) * 3;
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if (p->modelIndex == MODELS - 1)
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{
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S3L_Unit waterDepth = p->previousZ - p->depth;
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float transparency = waterDepth / ((float) (S3L_FRACTIONS_PER_UNIT / 2));
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transparency = transparency > 1.0 ? 1.0 : transparency;
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float transparency2 = 1.0 - transparency;
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uint8_t previousColor[3];
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previousColor[0] = frameBuffer[index];
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previousColor[1] = frameBuffer[index + 1];
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previousColor[2] = frameBuffer[index + 2];
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color[0] = transparency2 * previousColor[0];
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color[1] = transparency2 * previousColor[1];
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color[2] = transparency2 * previousColor[2] + transparency * 200;
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}
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else
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{
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color[0] = light;
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color[1] = light;
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color[2] = light / 2 + p->modelIndex * 127;
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}
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/*
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color[0] = S3L_clamp(127 + normal.x / 4,0,255);
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color[1] = S3L_clamp(127 + normal.y / 4,0,255);
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color[2] = S3L_clamp(127 + normal.z / 4,0,255);
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*/
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color[0] = S3L_clamp(p->depth - 8000,0,255);
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color[1] = color[0];
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color[2] = color[1];
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frameBuffer[index] = color[0];
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frameBuffer[index + 1] = color[1];
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frameBuffer[index + 2] = color[2];
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}
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void createGeometry()
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{
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int i = 0;
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for (int y = 0; y < GRID_H; ++y)
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for (int x = 0; x < GRID_W; ++x)
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{
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terrainVertices[i] = (x - GRID_W / 2) * S3L_FRACTIONS_PER_UNIT;
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terrainVertices[i + 1] = heightMap[i / 3] * S3L_FRACTIONS_PER_UNIT / 4;
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terrainVertices[i + 2] = (y - GRID_H / 2) * S3L_FRACTIONS_PER_UNIT;
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waterVertices[i] = terrainVertices[i] * 2;
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waterVertices[i + 1] = 0;
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waterVertices[i + 2] = terrainVertices[i + 2] * 2;
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i += 3;
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}
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i = 0;
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for (int y = 0; y < GRID_H - 1; ++y)
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for (int x = 0; x < GRID_W - 1; ++x)
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{
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S3L_Index indices[4];
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indices[0] = y * GRID_W + x;
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indices[1] = indices[0] + 1;
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indices[2] = indices[0] + GRID_W;
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indices[3] = indices[2] + 1;
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gridTriangles[i + 0] = indices[0];
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gridTriangles[i + 1] = indices[1];
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gridTriangles[i + 2] = indices[2];
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gridTriangles[i + 3] = indices[2];
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gridTriangles[i + 4] = indices[1];
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gridTriangles[i + 5] = indices[3];
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i += 6;
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}
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}
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void animateWater(int t)
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{
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for (int i = 1; i < GRID_W * GRID_H * 3; i += 3)
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waterVertices[i] = S3L_FRACTIONS_PER_UNIT / 2 + sin(i) * S3L_FRACTIONS_PER_UNIT / 4;
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S3L_computeModelNormals(models[MODELS - 1],waterNormals,0);
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}
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void clearFrameBuffer()
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{
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memset(frameBuffer,0,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",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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int main()
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{
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createGeometry();
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lightDirection.x = 10;
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lightDirection.y = 10;
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lightDirection.z = 10;
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lightDirection.w = 0;
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S3L_normalizeVec3(&lightDirection);
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S3L_initModel3D(
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terrainVertices,
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GRID_W * GRID_H,
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gridTriangles,
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GRID_TRIANGLES,
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&(models[0]));
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S3L_computeModelNormals(models[0],terrainNormals,0);
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S3L_initModel3D(
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waterVertices,
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GRID_W * GRID_H,
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gridTriangles,
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GRID_TRIANGLES,
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&(models[MODELS - 1]));
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S3L_initScene(models,MODELS,&scene);
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animateWater(0);
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scene.camera.transform.translation.x = 4 * S3L_FRACTIONS_PER_UNIT;
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scene.camera.transform.translation.y = 8 * S3L_FRACTIONS_PER_UNIT;
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scene.camera.transform.translation.z = -10 * S3L_FRACTIONS_PER_UNIT;
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scene.camera.transform.rotation.x = -S3L_FRACTIONS_PER_UNIT / 8;
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scene.camera.transform.rotation.y = -S3L_FRACTIONS_PER_UNIT / 8;
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clearFrameBuffer();
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S3L_newFrame();
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S3L_drawScene(scene);
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saveImage("test.ppm");
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return 0;
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}
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