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- /*
- * 3D Engine
- * main.c:
- * Based on pikuma.com 3D software renderer in C
- * Copyright (c) 2021 986-Studio. All rights reserved.
- *
- * Created by Manoël Trapier on 01/03/2021.
- */
- #include <stdio.h>
- #include <stdint.h>
- #include <stdbool.h>
- #include <SDL.h>
- #include <log.h>
- #include <array.h>
- #include <display.h>
- #include <vector.h>
- #include <mesh.h>
- bool isRunning = true;
- int previousFrameTime = 0;
- vec3_t cameraPosition =
- {
- .x = 0,
- .y = 0,
- .z = 0,
- };
- triangle_t *projectedTriangles = NULL;
- double fovFactor = 640;
- void setup()
- {
- frameBuffer = (uint32_t *)calloc(windowWidth * windowHeight, sizeof(uint32_t));
- if (!frameBuffer)
- {
- log(TLOG_PANIC, NULL, "Memory allocation error.");
- goto exit;
- }
- frameBufferTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, windowWidth,
- windowHeight);
- if (frameBufferTexture == NULL)
- {
- log(TLOG_PANIC, NULL, "SDL Texture creation error: %s", SDL_GetError());
- goto exit;
- }
- //loadCubeMeshData();
- loadOBJFile("assets/cube.obj");
- exit:
- return;
- }
- void processInput()
- {
- SDL_Event event;
- SDL_PollEvent(&event);
- switch (event.type)
- {
- case SDL_QUIT:isRunning = false;
- break;
- case SDL_KEYDOWN:
- if (event.key.keysym.sym == SDLK_ESCAPE)
- {
- isRunning = false;
- }
- break;
- default:
- break;
- }
- }
- vec2_t orthographicPointProjection(vec3_t point)
- {
- vec2_t ret;
- ret.x = point.x * fovFactor;
- ret.y = point.y * fovFactor;
- return ret;
- }
- vec2_t perspectivePointProjection(vec3_t point)
- {
- vec2_t ret;
- ret.x = (point.x/point.z) * (fovFactor/2.);
- ret.y = (point.y/point.z) * (fovFactor/2.);
- return ret;
- }
- void update()
- {
- uint32_t i, j;
- uint32_t faceCount;
- uint32_t timeToWait = FRAME_TARGET_TIME - (SDL_GetTicks() - previousFrameTime);
- if (timeToWait <= FRAME_TARGET_TIME)
- {
- SDL_Delay(timeToWait);
- }
- previousFrameTime = SDL_GetTicks();
- mesh.rotation.x += 0.01;
- mesh.rotation.y += 0.01;
- mesh.rotation.z += 0.02;
- arrayEmpty(projectedTriangles);
- faceCount = arrayGetSize(mesh.faces);
- for(i = 0; i < faceCount; i++)
- {
- triangle_t currentTriangle;
- vec3_t transformed[3];
- vec3_t vertices[3] =
- {
- mesh.vertices[mesh.faces[i].a - 1],
- mesh.vertices[mesh.faces[i].b - 1],
- mesh.vertices[mesh.faces[i].c - 1],
- };
- for(j = 0; j < 3; j++)
- {
- transformed[j] = vertices[j];
- transformed[j] = vec3RotateX(transformed[j], mesh.rotation.x);
- transformed[j] = vec3RotateY(transformed[j], mesh.rotation.y);
- transformed[j] = vec3RotateZ(transformed[j], mesh.rotation.z);
- transformed[j].z += 5;
- }
- vec3_t vectorBA = vec3SubVectors(transformed[1], transformed[0]);
- vec3_t vectorCA = vec3SubVectors(transformed[2], transformed[0]);
- vec3Normalize(&vectorBA);
- vec3Normalize(&vectorCA);
- vec3_t triangleNormal = vec3Cross(vectorBA, vectorCA);
- vec3Normalize(&triangleNormal);
- vec3_t cameraRay = vec3SubVectors(cameraPosition, transformed[0]);
- vec3Normalize(&cameraRay);
- double cameraDotTriangle = vec3Dot(triangleNormal, cameraRay);
- if (cameraDotTriangle < 0)
- {
- continue;
- }
- for (j = 0 ; j < 3 ; j++)
- {
- vec2_t projected = perspectivePointProjection(transformed[j]);
- projected.x += (windowWidth / 2);
- projected.y += (windowHeight / 2);
- currentTriangle.points[j] = projected;
- }
- arrayAdd(projectedTriangles, currentTriangle);
- }
- }
- void render()
- {
- int i;
- SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
- SDL_RenderClear(renderer);
- int triangleCount = arrayGetSize(projectedTriangles);
- for(i = 0; i < triangleCount; i++)
- {
- drawTriangle(projectedTriangles[i].points[0].x, projectedTriangles[i].points[0].y,
- projectedTriangles[i].points[1].x, projectedTriangles[i].points[1].y,
- projectedTriangles[i].points[2].x, projectedTriangles[i].points[2].y,
- 0xFF00FFFF);
- }
- renderFrameBuffer();
- clearFrameBuffer(0xFF000000);
- SDL_RenderPresent(renderer);
- }
- int main(int argc, char *argv[])
- {
- int param_i;
- bool fullScreen = false;
- MAX_DEBUG_LEVEL = TLOG_DEBUG;
- log(TLOG_ALWAYS, NULL, "Booting 3D Engine (version %s)!", VERSION);
- for (param_i = 1 ; (param_i < argc) && (argv[param_i][0] == '-') ; param_i++)
- {
- switch (argv[param_i][1])
- {
- default: exit(-1); /* Option not recognized */
- case 'f': fullScreen = true; break;
- case 'w': windowWidth = atoi(argv[++param_i]);
- case 'h': windowHeight = atoi(argv[++param_i]); break;
- #ifdef DYNA_LOG_LEVEL
- case 'l': MAX_DEBUG_LEVEL = atoi(argv[++param_i]); break;
- #endif
- case '-': goto no_more_params; /* Could use break, but this is more clear */
- }
- }
- no_more_params:
- isRunning = initialiseWindow(fullScreen);
- setup();
- while (isRunning)
- {
- processInput();
- update();
- render();
- }
- arrayFree(projectedTriangles);
- meshFree();
- destroyWindow();
- return 0;
- }
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