Working thread impl
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1 changed files with 88 additions and 53 deletions
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@ -3,6 +3,8 @@
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#include <cmath>
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#include <fstream>
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#include <array>
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#include <thread>
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#include <mutex>
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#include <glm/matrix.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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@ -316,74 +318,107 @@ Ex02::RT::Image Ex02::RT::renderColorsWithSpheres(
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lights[2].falloffStart = 3.0f;
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lights[2].falloffEnd = 7.0f;
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if(threadCount <= 1) {
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for(unsigned int j = 0; j < outputHeight; ++j) {
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float offsetY = ((float)j + 0.5f - ((float)outputHeight / 2.0f));
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for(unsigned int i = 0; i < outputWidth; ++i) {
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float offsetX = ((float)i + 0.5f - ((float)outputWidth / 2.0f));
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glm::vec3 rayDir{
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offsetX,
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offsetY,
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-(float)outputHeight * EX02_RAY_TRACER_VIEW_RATIO};
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glm::vec3 rayDirUnit = rayDir / std::sqrt(
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rayDir.x * rayDir.x
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+ rayDir.y * rayDir.y
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+ rayDir.z * rayDir.z);
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const auto yIteration = [&spheres, &lights, &image, outputWidth, outputHeight, rayPos] (unsigned int j, std::mutex *mutex) {
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float offsetY = ((float)j + 0.5f - ((float)outputHeight / 2.0f));
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for(unsigned int i = 0; i < outputWidth; ++i) {
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float offsetX = ((float)i + 0.5f - ((float)outputWidth / 2.0f));
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glm::vec3 rayDir{
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offsetX,
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offsetY,
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-(float)outputHeight * EX02_RAY_TRACER_VIEW_RATIO};
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glm::vec3 rayDirUnit = rayDir / std::sqrt(
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rayDir.x * rayDir.x
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+ rayDir.y * rayDir.y
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+ rayDir.z * rayDir.z);
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// cast ray to all spheres, finding closest result
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std::optional<std::tuple<glm::vec3, float, unsigned int>> closestResult;
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for(unsigned int idx = 0; idx < spheres.size(); ++idx) {
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auto result = spheres[idx].rayToSphere(rayPos, rayDirUnit);
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if(result) {
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float dist = Internal::distBetweenPositions(
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rayPos, spheres[idx].pos);
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if(closestResult) {
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if(dist < std::get<1>(*closestResult)) {
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closestResult = {{*result, dist, idx}};
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}
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} else {
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// cast ray to all spheres, finding closest result
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std::optional<std::tuple<glm::vec3, float, unsigned int>> closestResult;
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for(unsigned int idx = 0; idx < spheres.size(); ++idx) {
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auto result = spheres[idx].rayToSphere(rayPos, rayDirUnit);
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if(result) {
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float dist = Internal::distBetweenPositions(
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rayPos, spheres[idx].pos);
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if(closestResult) {
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if(dist < std::get<1>(*closestResult)) {
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closestResult = {{*result, dist, idx}};
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}
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} else {
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closestResult = {{*result, dist, idx}};
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}
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}
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}
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if(!closestResult) {
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if(!closestResult) {
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continue;
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}
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// cast ray to each light checking if colliding with other
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// spheres
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for(const auto &light : lights) {
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glm::vec3 toLight = light.pos - std::get<0>(*closestResult);
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glm::vec3 toLightUnit = toLight / std::sqrt(
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toLight.x * toLight.x
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+ toLight.y * toLight.y
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+ toLight.z * toLight.z);
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bool isBlocked = false;
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for(unsigned int idx = 0; idx < spheres.size(); ++idx) {
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if(idx == std::get<2>(*closestResult)) {
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continue;
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}
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auto result = spheres[idx].rayToSphere(
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std::get<0>(*closestResult),
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toLightUnit);
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if(result) {
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isBlocked = true;
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break;
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}
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}
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if(isBlocked) {
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continue;
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}
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// cast ray to each light checking if colliding with other
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// spheres
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for(const auto &light : lights) {
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glm::vec3 toLight = light.pos - std::get<0>(*closestResult);
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glm::vec3 toLightUnit = toLight / std::sqrt(
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toLight.x * toLight.x
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+ toLight.y * toLight.y
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+ toLight.z * toLight.z);
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bool isBlocked = false;
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for(unsigned int idx = 0; idx < spheres.size(); ++idx) {
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if(idx == std::get<2>(*closestResult)) {
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continue;
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}
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auto result = spheres[idx].rayToSphere(
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std::get<0>(*closestResult),
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toLightUnit);
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if(result) {
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isBlocked = true;
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break;
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}
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}
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if(isBlocked) {
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continue;
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}
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// at this point, it is known that no spheres blocks ray
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// to light
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// at this point, it is known that no spheres blocks ray
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// to light
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if(mutex) {
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std::lock_guard<std::mutex> lock(*mutex);
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light.applyLight(
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std::get<0>(*closestResult),
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image.getPixel(i, j));
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} else {
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light.applyLight(
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std::get<0>(*closestResult),
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image.getPixel(i, j));
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}
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}
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}
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};
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if(threadCount <= 1) {
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for(unsigned int j = 0; j < outputHeight; ++j) {
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yIteration(j, nullptr);
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}
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} else {
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std::vector<std::thread> threads;
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std::mutex mutex;
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unsigned int range = outputHeight / threadCount;
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for(unsigned int threadIdx = 0; threadIdx < threadCount; ++threadIdx) {
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unsigned int start = range * threadIdx;
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unsigned int end = range * (threadIdx + 1);
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if(threadIdx + 1 == threadCount) {
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end = outputHeight;
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}
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threads.emplace_back(std::thread([&yIteration] (unsigned int start, unsigned int end, std::mutex *mutex) {
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for(unsigned int y = start; y < end; ++y) {
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yIteration(y, mutex);
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}
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},
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start,
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end,
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&mutex));
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}
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for(std::thread &thread : threads) {
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thread.join();
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}
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}
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return image;
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