You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.3 KiB
75 lines
2.3 KiB
#include "Scene.h"
|
|
#include "util.h"
|
|
#include "Camera.h"
|
|
#include "Ray.h"
|
|
#include "Vector3.h"
|
|
#include "Sphere.h"
|
|
#pragma comment(lib, "winmm.lib")
|
|
static int sTotalPixelCount = 0;
|
|
static int sViewportWidth = 0, sViewportHeight = 0;
|
|
static Camera* sCamera = nullptr;
|
|
Sphere sphere(Vector3(0.0f, 0.0f, -5.0f), 0.5f);
|
|
void Init(int width, int height)
|
|
{
|
|
sTotalPixelCount = width * height;
|
|
sViewportWidth = width;
|
|
sViewportHeight = height;
|
|
sCamera = new Camera(45.0f, float(width) / float(height));
|
|
sCamera->LookAt(Vector3(0.0f, 0.0f, 0.0f), Vector3(0.0f, 0.0f, -1.0f), Vector3(0.0f, 1.0f, 0.0f));
|
|
}
|
|
|
|
float GetEscaptedTime() {
|
|
static unsigned long sTimeSinceComputerStart = 0;
|
|
static unsigned long sLastFrameTime = 0;
|
|
sTimeSinceComputerStart = timeGetTime();
|
|
unsigned long frame_time = sLastFrameTime == 0 ? 0 : sTimeSinceComputerStart - sLastFrameTime;
|
|
sLastFrameTime = sTimeSinceComputerStart;
|
|
|
|
return float(frame_time) / 1000.0f;
|
|
}
|
|
|
|
Vector3 GetEnviromentColor(const Ray& input_ray) {
|
|
Vector3 bottom_color(1.0f, 1.0f, 1.0f);
|
|
Vector3 top_color(0.5f, 0.7f, 1.0f);
|
|
float factor = 0.5f * input_ray.mDirection.y + 0.5f;
|
|
return factor * top_color + (1.0f - factor) * bottom_color;
|
|
}
|
|
|
|
void RenderOnePixel(int pixel_index) {
|
|
int x = pixel_index % sViewportWidth;
|
|
int y = pixel_index / sViewportWidth;
|
|
float u = float(x) / sViewportWidth;
|
|
float v = float(y) / sViewportHeight;
|
|
Ray ray = sCamera->GetRay(u,v);
|
|
HitPoint hit_point;
|
|
if (sphere.HitTest(ray, 0.0f, 100.0f, hit_point)) {
|
|
float rf = hit_point.mNormal.x * 0.5f + 0.5f;
|
|
float gf = hit_point.mNormal.y * 0.5f + 0.5f;
|
|
float bf = hit_point.mNormal.z * 0.5f + 0.5f;
|
|
AByte r = AByte(rf * 255.0f);
|
|
AByte g = AByte(gf * 255.0f);
|
|
AByte b = AByte(bf * 255.0f);
|
|
SetColor(x, y, r, g, b, 255);
|
|
}
|
|
else {
|
|
Vector3 color = GetEnviromentColor(ray);
|
|
AByte r = AByte(color.x * 255.0f);
|
|
AByte g = AByte(color.y * 255.0f);
|
|
AByte b = AByte(color.z * 255.0f);
|
|
SetColor(x, y, r, g, b, 255);
|
|
}
|
|
}
|
|
|
|
void Render()
|
|
{
|
|
static int sCurrentRenderPixel = 0;
|
|
float current_render_time = 0.0f;
|
|
while (sCurrentRenderPixel < sTotalPixelCount) {
|
|
RenderOnePixel(sCurrentRenderPixel);
|
|
sCurrentRenderPixel++;
|
|
current_render_time = GetEscaptedTime();
|
|
if (current_render_time > 0.016f) {
|
|
break;
|
|
}
|
|
}
|
|
}
|