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This commit is contained in:
Stephen Seo 2021-08-23 18:30:20 +09:00
parent 653f0cafcb
commit 48c5d42c74
3 changed files with 123 additions and 81 deletions
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25
example02_threaded_raytracing/src/main.cpp
View file

@ -11,7 +11,6 @@ void printHelp() {
" | --threads <integer> Set the number of threads to use (default 1)\n"
"--width <integer> Set the width of the output image\n"
"--height <integer> Set the height of the output image\n"
"--radius <float> Set the radius of the sphere\n"
"-o <filename>\n"
" | --output <filename> Set the output filename for the image"
<< std::endl;
@ -21,7 +20,6 @@ int main(int argc, char **argv) {
int threadCount = 1;
unsigned int outputWidth = 1600;
unsigned int outputHeight = 1600;
float sphereRadius = 1.5f;
std::string outputFile = "raytrace_out";
{
@ -37,7 +35,6 @@ int main(int argc, char **argv) {
"--threads",
"--width",
"--height",
"--radius",
"-o",
"--output",
});
@ -114,24 +111,6 @@ int main(int argc, char **argv) {
std::cout << "ERROR: height cannot be 0" << std::endl;
return 8;
}
if(auto iter = results.find("--radius"); iter != results.end()) {
try {
sphereRadius = stof(iter->second);
} catch (const std::invalid_argument &e) {
std::cout << "ERROR: Failed to parse radius (invalid)"
<< std::endl;
return 9;
} catch (const std::out_of_range &e) {
std::cout << "ERROR: Failed to parse radius (out_of_range)"
<< std::endl;
return 10;
}
}
if(sphereRadius <= 0.0f) {
std::cout << "ERROR: radius must be positive and non-zero"
<< std::endl;
return 11;
}
if(auto iter = results.find("-o"); iter != results.end()) {
outputFile = iter->second;
} else if(auto iter = results.find("--output"); iter != results.end()) {
@ -144,9 +123,9 @@ int main(int argc, char **argv) {
}
auto pixels = Ex02::RT::renderGraySphere(
outputWidth, outputHeight, sphereRadius, threadCount);
outputWidth, outputHeight, threadCount);
Ex02::RT::writeGrayscaleToFile(pixels, outputWidth, outputFile);
pixels.writeToFile(outputFile);
return 0;
}

138
example02_threaded_raytracing/src/rayTracer.cpp
View file

@ -9,6 +9,43 @@
const float PI = std::acos(-1.0f);
Ex02::RT::Pixel::Pixel() :
r(0),
g(0),
b(0)
{}
Ex02::RT::Image::Image(unsigned int width, unsigned int height) :
width(width)
{
data.resize(width * height);
}
Ex02::RT::Pixel& Ex02::RT::Image::getPixel(
unsigned int x, unsigned int y) {
return data.at(x + y * width);
}
const Ex02::RT::Pixel& Ex02::RT::Image::getPixel(
unsigned int x, unsigned int y) const {
return data.at(x + y * width);
}
void Ex02::RT::Image::writeToFile(const std::string &filename) const {
std::ofstream out(filename + ".ppm");
out << "P3\n" << width << ' ' << data.size() / width << " 255"
<< '\n';
for(unsigned int j = 0; j < data.size() / width; ++j) {
for(unsigned int i = 0; i < width; ++i) {
out << (int)data.at(i + j * width).r << ' '
<< (int)data.at(i + j * width).g << ' '
<< (int)data.at(i + j * width).b << ' ';
}
out << '\n';
}
}
glm::vec3 Ex02::RT::Internal::defaultSpherePos() {
return glm::vec3{0.0f, 0.0f, -2.5f};
}
@ -44,13 +81,6 @@ std::optional<glm::vec3> Ex02::RT::Internal::rayToSphere(
glm::vec3 rayDir,
glm::vec3 spherePos,
float sphereRadius) {
// ensure rayDir is a unit vector
float rayDirLength = std::sqrt(
rayDir.x * rayDir.x
+ rayDir.y * rayDir.y
+ rayDir.z * rayDir.z);
rayDir /= rayDirLength;
// check if there is collision
glm::vec3 tempVec = rayPos - spherePos;
float temp =
@ -96,15 +126,44 @@ float Ex02::RT::Internal::angleBetweenRays(glm::vec3 a, glm::vec3 b) {
return std::acos(dot / amag / bmag);
}
std::vector<unsigned char> Ex02::RT::renderGraySphere(
Ex02::RT::Internal::RTSVisibleType Ex02::RT::Internal::rayToSphereVisible(
glm::vec3 rayPos,
glm::vec3 rayDir,
glm::vec3 spherePos,
float sphereRadius,
glm::vec3 lightPos) {
glm::vec3 rayDirUnit = rayDir / std::sqrt(
rayDir.x * rayDir.x
+ rayDir.y * rayDir.y
+ rayDir.z * rayDir.z);
auto collPos = rayToSphere(rayPos, rayDirUnit, spherePos, sphereRadius);
if(collPos) {
glm::vec3 toLight = lightPos - *collPos;
glm::vec3 toLightUnit = toLight / std::sqrt(
toLight.x * toLight.x
+ toLight.y * toLight.y
+ toLight.z * toLight.z);
glm::vec3 toLightPos = *collPos + toLight / 3.0f;
auto collResult = Internal::rayToSphere(
toLightPos, toLightUnit, spherePos, sphereRadius);
if(collResult) {
return {};
} else {
return {{*collPos, toLight}};
}
} else {
return {};
}
}
Ex02::RT::Image Ex02::RT::renderGraySphere(
unsigned int outputWidth,
unsigned int outputHeight,
float sphereRadius,
int threadCount,
glm::vec3 spherePos,
glm::vec3 lightPos) {
std::vector<unsigned char> grayscalePixels;
grayscalePixels.resize(outputWidth * outputHeight);
Image image(outputWidth, outputHeight);
glm::vec3 rayPos{0.0f, 0.0f, 0.0f};
float lightFalloffStart = 4.5f;
float lightFalloffEnd = 7.0f;
@ -115,33 +174,27 @@ std::vector<unsigned char> Ex02::RT::renderGraySphere(
float offsetX = ((float)i + 0.5f - ((float)outputWidth / 2.0f));
glm::vec3 rayDir = glm::vec3{
offsetX, offsetY, -(float)outputHeight * EX02_RAY_TRACER_VIEW_RATIO};
auto rayResult = Internal::rayToSphere(
rayPos, rayDir, spherePos, sphereRadius);
auto rayResult = Internal::rayToSphereVisible(
rayPos, rayDir,
spherePos, EX02_RAY_TRACER_GRAY_SPHERE_RADIUS,
lightPos);
if(rayResult) {
glm::vec3 toLight = lightPos - *rayResult;
glm::vec3 toLightCached = toLight;
toLight /= std::sqrt(
toLight.x * toLight.x
+ toLight.y * toLight.y
+ toLight.z * toLight.z);
glm::vec3 toLightPos = *rayResult + toLight;
auto collResult = Internal::rayToSphere(
toLightPos, toLight, spherePos, sphereRadius);
if(collResult) {
continue;
}
glm::vec3 *toLight = &std::get<1>(rayResult.value());
float dist = std::sqrt(
toLightCached.x * toLightCached.x
+ toLightCached.y * toLightCached.y
+ toLightCached.z * toLightCached.z);
toLight->x * toLight->x
+ toLight->y * toLight->y
+ toLight->z * toLight->z);
if(dist < lightFalloffStart) {
grayscalePixels.at(i + j * outputWidth) = 255;
image.getPixel(i, j).r = 255;
image.getPixel(i, j).g = 255;
image.getPixel(i, j).b = 255;
} else if(dist >= lightFalloffStart && dist <= lightFalloffEnd) {
grayscalePixels.at(i + j * outputWidth) =
image.getPixel(i, j).r =
(1.0f - (dist - lightFalloffStart)
/ (lightFalloffEnd - lightFalloffStart))
* 255.0f;
/ (lightFalloffEnd - lightFalloffStart))
* 255.0f;
image.getPixel(i, j).g = image.getPixel(i, j).r;
image.getPixel(i, j).b = image.getPixel(i, j).r;
}
}
}
@ -149,22 +202,5 @@ std::vector<unsigned char> Ex02::RT::renderGraySphere(
} else {
}
return grayscalePixels;
}
void Ex02::RT::writeGrayscaleToFile(
const std::vector<unsigned char> &pixels,
unsigned int outputWidth,
std::string filename) {
std::ofstream out(filename + ".pgm");
out << "P2\n" << outputWidth << ' ' << pixels.size() / outputWidth << " 255"
<< '\n';
for(unsigned int j = 0; j < pixels.size() / outputWidth; ++j) {
for(unsigned int i = 0; i < outputWidth; ++i) {
out << (int)pixels.at(i + j * outputWidth)
<< ' ';
}
out << '\n';
}
return image;
}

41
example02_threaded_raytracing/src/rayTracer.hpp
View file

@ -5,10 +5,12 @@
#define EX02_RAY_TRACER_DEFAULT_NEAR_PLANE 0.2f
#define EX02_RAY_TRACER_DEFAULT_FAR_PLANE 4.0f
#define EX02_RAY_TRACER_COLL_INCREMENT 2.0f
#define EX02_RAY_TRACER_GRAY_SPHERE_RADIUS 1.5f
#include <vector>
#include <optional>
#include <string>
#include <tuple>
#include <glm/vec3.hpp>
#include <glm/mat4x4.hpp>
@ -17,10 +19,32 @@
namespace Ex02 {
namespace RT {
struct Pixel {
Pixel();
unsigned char r,g,b;
};
class Image {
public:
Image(unsigned int width, unsigned int height);
Pixel& getPixel(unsigned int x, unsigned int y);
const Pixel& getPixel(unsigned int x, unsigned int y) const;
void writeToFile(const std::string &filename) const;
private:
unsigned int width;
std::vector<Pixel> data;
};
namespace Internal {
glm::vec3 defaultSpherePos();
glm::vec3 defaultLightPos();
// returns pos of collision
std::optional<glm::vec3> rayToSphere(
glm::vec3 rayPos,
glm::vec3 rayDir,
@ -30,22 +54,25 @@ namespace Internal {
float angleBetweenRays(
glm::vec3 a,
glm::vec3 b);
// first vec3 is result from rayToSphere(), second is ray to light source
typedef std::optional<std::tuple<glm::vec3, glm::vec3>> RTSVisibleType;
RTSVisibleType rayToSphereVisible(
glm::vec3 rayPos,
glm::vec3 rayDir,
glm::vec3 spherePos,
float sphereRadius,
glm::vec3 lightPos);
}
std::vector<unsigned char> renderGraySphere(
Image renderGraySphere(
unsigned int outputWidth,
unsigned int outputHeight,
float sphereRadius,
int threadCount = 1,
glm::vec3 spherePos = Internal::defaultSpherePos(),
glm::vec3 lightPos = Internal::defaultLightPos()
);
void writeGrayscaleToFile(
const std::vector<unsigned char> &pixels,
unsigned int outputWidth,
std::string filename);
} // namespace RT
} // namespace Ex02