[#111] add sph project and flipflop buffer

projects/CMakeLists.txt

@@ -4,6 +4,7 @@ add_subdirectory(first_triangle)
 add_subdirectory(first_mesh)
 add_subdirectory(first_scene)
 add_subdirectory(particle_simulation)
+add_subdirectory(sph)
 add_subdirectory(voxelization)
 add_subdirectory(mesh_shader)
 add_subdirectory(indirect_dispatch)

projects/sph/.gitignore

+particle_simulation
\ No newline at end of file

projects/sph/CMakeLists.txt

+cmake_minimum_required(VERSION 3.16)
+project(sph)
+
+# setting c++ standard for the project
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# this should fix the execution path to load local files from the project
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+# adding source files to the project
+add_executable(sph
+		src/main.cpp
+		src/ParticleSystem.hpp 
+		src/ParticleSystem.cpp
+		src/Particle.hpp 
+		src/Particle.cpp
+		src/BloomAndFlares.hpp
+		src/BloomAndFlares.cpp)
+
+# this should fix the execution path to load local files from the project (for MSVC)
+if(MSVC)
+	set_target_properties(sph PROPERTIES RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+	set_target_properties(sph PROPERTIES RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+
+	# in addition to setting the output directory, the working directory has to be set
+	# by default visual studio sets the working directory to the build directory, when using the debugger
+	set_target_properties(sph PROPERTIES VS_DEBUGGER_WORKING_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+endif()
+
+# including headers of dependencies and the VkCV framework
+target_include_directories(sph SYSTEM BEFORE PRIVATE ${vkcv_include} ${vkcv_includes} ${vkcv_testing_include} ${vkcv_camera_include} ${vkcv_shader_compiler_include})
+
+# linking with libraries from all dependencies and the VkCV framework
+target_link_libraries(sph vkcv vkcv_testing vkcv_camera vkcv_shader_compiler)

projects/sph/shaders/bloom/composite.comp

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(set=0, binding=0) uniform texture2D                          blurImage;
+layout(set=0, binding=1) uniform texture2D                          lensImage;
+layout(set=0, binding=2) uniform sampler                            linearSampler;
+layout(set=0, binding=3, r11f_g11f_b10f) uniform image2D            colorBuffer;
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+
+void main()
+{
+    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(colorBuffer)))){
+        return;
+    }
+
+    ivec2 pixel_coord   = ivec2(gl_GlobalInvocationID.xy);
+    vec2  pixel_size    = vec2(1.0f) / textureSize(sampler2D(blurImage, linearSampler), 0);
+    vec2  UV            = pixel_coord.xy * pixel_size;
+
+    vec4 composite_color = vec4(0.0f);
+
+    vec3 blur_color   = texture(sampler2D(blurImage, linearSampler), UV).rgb;
+    vec3 lens_color   = texture(sampler2D(lensImage, linearSampler), UV).rgb;
+    vec3 main_color   = imageLoad(colorBuffer, pixel_coord).rgb;
+
+    // composite blur and lens features
+    float bloom_weight = 0.01f;
+    float lens_weight  = 0.f;
+    float main_weight = 1 - (bloom_weight + lens_weight);
+
+    composite_color.rgb = blur_color * bloom_weight +
+                          lens_color * lens_weight  +
+                          main_color * main_weight;
+
+    imageStore(colorBuffer, pixel_coord, composite_color);
+}
\ No newline at end of file

projects/sph/shaders/bloom/downsample.comp

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(set=0, binding=0) uniform texture2D                          inBlurImage;
+layout(set=0, binding=1) uniform sampler                            inImageSampler;
+layout(set=0, binding=2, r11f_g11f_b10f) uniform writeonly image2D  outBlurImage;
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+
+void main()
+{
+    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(outBlurImage)))){
+        return;
+    }
+
+    ivec2 pixel_coord   = ivec2(gl_GlobalInvocationID.xy);
+    vec2  pixel_size    = vec2(1.0f) / imageSize(outBlurImage);
+    vec2  UV            = pixel_coord.xy * pixel_size;
+    vec2  UV_offset     = UV + 0.5f * pixel_size;
+
+    vec2 color_fetches[13] = {
+        // center neighbourhood (RED)
+        vec2(-1,  1), // LT
+        vec2(-1, -1), // LB
+        vec2( 1, -1), // RB
+        vec2( 1,  1), // RT
+
+        vec2(-2, 2), // LT
+        vec2( 0, 2), // CT
+        vec2( 2, 2), // RT
+
+        vec2(0 ,-2), // LC
+        vec2(0 , 0), // CC
+        vec2(2,  0), // CR
+
+        vec2(-2, -2), // LB
+        vec2(0 , -2), // CB
+        vec2(2 , -2)  // RB
+    };
+
+    float color_weights[13] = {
+        // 0.5f
+        1.f/8.f,
+        1.f/8.f,
+        1.f/8.f,
+        1.f/8.f,
+
+        // 0.125f
+        1.f/32.f,
+        1.f/16.f,
+        1.f/32.f,
+
+        // 0.25f
+        1.f/16.f,
+        1.f/8.f,
+        1.f/16.f,
+
+        // 0.125f
+        1.f/32.f,
+        1.f/16.f,
+        1.f/32.f
+    };
+
+    vec3 sampled_color = vec3(0.0f);
+
+    for(uint i = 0; i < 13; i++)
+    {
+        vec2 color_fetch = UV_offset + color_fetches[i] * pixel_size;
+        vec3 color = texture(sampler2D(inBlurImage, inImageSampler), color_fetch).rgb;
+        color *= color_weights[i];
+        sampled_color += color;
+    }
+
+    imageStore(outBlurImage, pixel_coord, vec4(sampled_color, 1.f));
+}
\ No newline at end of file

projects/sph/shaders/bloom/lensFlares.comp

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(set=0, binding=0) uniform texture2D                          blurBuffer;
+layout(set=0, binding=1) uniform sampler                            linearSampler;
+layout(set=0, binding=2, r11f_g11f_b10f) uniform image2D            lensBuffer;
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+vec3 sampleColorChromaticAberration(vec2 _uv)
+{
+    vec2 toCenter = (vec2(0.5) - _uv);
+
+    vec3    colorScales     = vec3(-1, 0, 1);
+    float   aberrationScale = 0.1;
+    vec3 scaleFactors = colorScales * aberrationScale;
+
+    float r = texture(sampler2D(blurBuffer, linearSampler), _uv + toCenter * scaleFactors.r).r;
+    float g = texture(sampler2D(blurBuffer, linearSampler), _uv + toCenter * scaleFactors.g).g;
+    float b = texture(sampler2D(blurBuffer, linearSampler), _uv + toCenter * scaleFactors.b).b;
+    return vec3(r, g, b);
+}
+
+// _uv assumed to be flipped UV coordinates!
+vec3 ghost_vectors(vec2 _uv)
+{
+    vec2 ghost_vec = (vec2(0.5f) - _uv);
+
+    const uint c_ghost_count = 64;
+    const float c_ghost_spacing = length(ghost_vec) / c_ghost_count;
+
+    ghost_vec *= c_ghost_spacing;
+
+    vec3 ret_color = vec3(0.0f);
+
+    for (uint i = 0; i < c_ghost_count; ++i)
+    {
+        // sample scene color
+        vec2 s_uv = fract(_uv + ghost_vec * vec2(i));
+        vec3 s = sampleColorChromaticAberration(s_uv);
+
+        // tint/weight
+        float d = distance(s_uv, vec2(0.5));
+        float weight = 1.0f - smoothstep(0.0f, 0.75f, d);
+        s *= weight;
+
+        ret_color += s;
+    }
+
+    ret_color /= c_ghost_count;
+    return ret_color;
+}
+
+vec3 halo(vec2 _uv)
+{
+    const float c_aspect_ratio = float(imageSize(lensBuffer).x) / float(imageSize(lensBuffer).y);
+    const float c_radius = 0.6f;
+    const float c_halo_thickness = 0.1f;
+
+    vec2 halo_vec = vec2(0.5) - _uv;
+    //halo_vec.x /= c_aspect_ratio;
+    halo_vec = normalize(halo_vec);
+    //halo_vec.x *= c_aspect_ratio;
+
+
+    //vec2 w_uv = (_uv - vec2(0.5, 0.0)) * vec2(c_aspect_ratio, 1.0) + vec2(0.5, 0.0);
+    vec2 w_uv = _uv;
+    float d = distance(w_uv, vec2(0.5)); // distance to center
+
+    float distance_to_halo = abs(d - c_radius);
+
+    float halo_weight = 0.0f;
+    if(abs(d - c_radius) <= c_halo_thickness)
+    {
+        float distance_to_border = c_halo_thickness - distance_to_halo;
+        halo_weight = distance_to_border / c_halo_thickness;
+
+        //halo_weight = clamp((halo_weight / 0.4f), 0.0f, 1.0f);
+        halo_weight = pow(halo_weight, 2.0f);
+
+
+        //halo_weight = 1.0f;
+    }
+
+    return sampleColorChromaticAberration(_uv + halo_vec) * halo_weight;
+}
+
+
+
+void main()
+{
+    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(lensBuffer)))){
+        return;
+    }
+
+    ivec2 pixel_coord   = ivec2(gl_GlobalInvocationID.xy);
+    vec2  pixel_size    = vec2(1.0f) / imageSize(lensBuffer);
+    vec2  UV            = pixel_coord.xy * pixel_size;
+
+    vec2 flipped_UV = vec2(1.0f) - UV;
+
+    vec3 color = vec3(0.0f);
+
+    color += ghost_vectors(flipped_UV);
+    color += halo(UV);
+    color  *= 0.5f;
+
+    imageStore(lensBuffer, pixel_coord, vec4(color, 0.0f));
+}
\ No newline at end of file

projects/sph/shaders/bloom/upsample.comp

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(set=0, binding=0) uniform texture2D                          inUpsampleImage;
+layout(set=0, binding=1) uniform sampler                            inImageSampler;
+layout(set=0, binding=2, r11f_g11f_b10f) uniform image2D  outUpsampleImage;
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+void main()
+{
+    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(outUpsampleImage)))){
+        return;
+    }
+
+
+    ivec2 pixel_coord   = ivec2(gl_GlobalInvocationID.xy);
+    vec2  pixel_size    = vec2(1.0f) / imageSize(outUpsampleImage);
+    vec2  UV            = pixel_coord.xy * pixel_size;
+
+    const float gauss_kernel[3] = {1.f, 2.f, 1.f};
+    const float gauss_weight = 16.f;
+
+    vec3 sampled_color = vec3(0.f);
+
+    for(int i = -1; i <= 1; i++)
+    {
+        for(int j = -1; j <= 1; j++)
+        {
+            vec2 sample_location = UV + vec2(j, i) * pixel_size;
+            vec3 color = texture(sampler2D(inUpsampleImage, inImageSampler), sample_location).rgb;
+            color *= gauss_kernel[j+1];
+            color *= gauss_kernel[i+1];
+            color /= gauss_weight;
+
+            sampled_color += color;
+        }
+    }
+
+    //vec3 prev_color = imageLoad(outUpsampleImage, pixel_coord).rgb;
+    //float bloomRimStrength = 0.75f; // adjust this to change strength of bloom
+    //sampled_color = mix(prev_color, sampled_color, bloomRimStrength);
+
+    imageStore(outUpsampleImage, pixel_coord, vec4(sampled_color, 1.f));
+}
\ No newline at end of file

projects/sph/shaders/particleShading.inc

+float circleFactor(vec2 triangleCoordinates){
+    // percentage of distance from center to circle edge
+    float p = clamp((0.4 - length(triangleCoordinates)) / 0.4, 0, 1);
+    // remapping for nice falloff
+    return sqrt(p);
+}
\ No newline at end of file

projects/sph/shaders/shader.vert

+#version 460 core
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) in vec3 particle;
+
+struct Particle
+{
+    vec3 position;
+    float lifeTime;
+    vec3 velocity;
+    float padding_2;
+    vec3 reset_velocity;
+    float padding_3;
+};
+
+layout(std430, binding = 2) readonly buffer buffer_inParticle1
+{
+    Particle inParticle1[];
+};
+
+layout(std430, binding = 3) readonly buffer buffer_inParticle2
+{
+    Particle inParticle2[];
+};
+
+layout( push_constant ) uniform constants{
+    mat4 view;
+    mat4 projection;
+};
+
+layout(location = 0) out vec2 passTriangleCoordinates;
+layout(location = 1) out vec3 passVelocity;
+layout(location = 2) out float passlifeTime;
+
+void main()
+{
+    int id = gl_InstanceIndex;
+    passVelocity = inParticle1[id].velocity;
+    passlifeTime = inParticle1[id].lifeTime;
+    // particle position in view space
+    vec4 positionView = view * vec4(inParticle1[id].position, 1);
+    // by adding the triangle position in view space the mesh is always camera facing
+    positionView.xyz += particle;
+    // multiply with projection matrix for final position
+	gl_Position = projection * positionView;
+    
+    // 0.01 corresponds to vertex position size in main
+    float normalizationDivider  = 0.012;
+    passTriangleCoordinates     = particle.xy / normalizationDivider;
+}
\ No newline at end of file

projects/sph/shaders/shader_gravity.comp

+#version 450 core
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(local_size_x = 256) in;
+
+struct Particle
+{
+    vec3 position;
+    float lifeTime;
+    vec3 velocity;
+    float mass;
+    vec3 reset_velocity;
+    float _padding;
+};
+
+layout(std430, binding = 0) coherent buffer buffer_inParticle
+{
+    Particle inParticle[];
+};
+
+layout( push_constant ) uniform constants{
+    float deltaTime;
+    float rand;
+};
+
+const int n = 4;
+vec4 gravityPoint[n] = vec4[n](
+    vec4(-0.8, -0.5,  0.0, 3),
+    vec4(-0.4,  0.5,  0.8, 2),
+    vec4( 0.8,  0.8, -0.3, 4),
+    vec4( 0.5, -0.7, -0.5, 1)
+);
+
+const float G = 6.6743015e-11;
+const float sim_d_factor = 10e11;
+const float sim_g_factor = 10e30;
+const float sim_t_factor = 5;
+const float c = 299792458;
+
+void main() {
+    uint id = gl_GlobalInvocationID.x;
+    inParticle[id].lifeTime -= deltaTime;
+    vec3 pos = inParticle[id].position;
+    vec3 vel = inParticle[id].velocity;
+    float mass = inParticle[id].mass;
+
+    if(inParticle[id].lifeTime < 0.f)
+    {
+        inParticle[id].lifeTime = 5.f * rand;
+        inParticle[id].mass *= rand;
+
+        pos = vec3(0);
+        vel *= rand;
+    }
+
+    for(int i = 0; i < n; i++)
+    {
+        vec3 d = (gravityPoint[i].xyz - pos) * sim_d_factor;
+        float r = length(d);
+        float g = G * (gravityPoint[i].w * sim_g_factor) / (r * r);
+
+        if (r > 0) {
+            vec3 dvel = (deltaTime * sim_t_factor) * g * (d / r);
+
+            vel = (vel + dvel) / (1.0 + dot(vel, dvel) / (c*c));
+        }
+    }
+
+    pos += vel * (deltaTime * sim_t_factor);
+
+    vec3 a_pos = abs(pos);
+
+    if ((a_pos.x > 2.0) || (a_pos.y > 2.0) || (a_pos.z > 2.0))
+    {
+        inParticle[id].lifeTime *= 0.9;
+    }
+
+    inParticle[id].position = pos;
+    inParticle[id].velocity = vel;
+}

projects/sph/shaders/shader_space.comp

+#version 450 core
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(local_size_x = 256) in;
+
+struct Particle
+{
+    vec3 position;
+    float lifeTime;
+    vec3 velocity;
+    float padding_2;
+    vec3 reset_velocity;
+    float padding_3;
+};
+
+layout(std430, binding = 0) coherent buffer buffer_inParticle
+{
+    Particle inParticle[];
+};
+
+layout( push_constant ) uniform constants{
+    float deltaTime;
+    float rand;
+};
+
+vec3 attraction(vec3 pos, vec3 attractPos)
+{
+    vec3 delta = attractPos - pos;
+    const float damp = 0.5;
+    float dDampedDot = dot(delta, delta) + damp;
+    float invDist = 1.0f / sqrt(dDampedDot);
+    float invDistCubed = invDist*invDist*invDist;
+    return delta * invDistCubed * 0.0035;
+}
+
+vec3 repulsion(vec3 pos, vec3 attractPos)
+{
+    vec3 delta = attractPos - pos;
+    float targetDistance = sqrt(dot(delta, delta));
+    return delta * (1.0 / (targetDistance * targetDistance * targetDistance)) * -0.000035;
+}
+
+
+const int n = 4;
+vec3 gravity = vec3(0,-9.8,0);
+vec3 gravityPoint[n] = vec3[n](vec3(-0.3, .5, -0.6),vec3(-0.2, 0.6, -0.3),vec3(.4, -0.4, 0.6),vec3(-.4, -0.4, -0.6));
+//vec3 gravityPoint[n] = vec3[n](vec3(-0.5, 0.5, 0));
+void main() {
+    uint id = gl_GlobalInvocationID.x;
+    inParticle[id].lifeTime -= deltaTime;
+    vec3 pos = inParticle[id].position;
+    vec3 vel = inParticle[id].velocity;
+    if(inParticle[id].lifeTime < 0.f)
+    {
+        inParticle[id].lifeTime = 5.f;
+        pos = vec3(0);
+    }
+    //    inParticle[id].position += deltaTime * -normalize(max(2 - distance(inParticle[id].position,respawnPos),0.0) * respawnPos - inParticle[id].position);
+
+    for(int i = 0; i < n; i++)
+    {
+        vel += deltaTime * deltaTime * normalize(max(2 - distance(pos,gravityPoint[i]),0.1) * gravityPoint[i] - pos);
+    }
+
+    if((pos.x <= -2.0) || (pos.x > 2.0) || (pos.y <= -2.0) || (pos.y > 2.0)|| (pos.z <= -2.0) || (pos.z > 2.0)){
+        vel = (-vel * 0.1);
+    }
+
+    pos += normalize(vel) * deltaTime;
+    inParticle[id].position = pos;
+    float rand1 = rand;
+    inParticle[id].velocity = vel;
+}

projects/sph/shaders/shader_space.frag

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_GOOGLE_include_directive : enable
+
+#include "particleShading.inc"
+
+layout(location = 0) in vec2 passTriangleCoordinates;
+layout(location = 1) in vec3 passVelocity;
+layout(location = 2) in float passlifeTime;
+
+layout(location = 0) out vec3 outColor;
+
+layout(set=0, binding=0) uniform uColor {
+	vec4 color;
+} Color;
+
+layout(set=0,binding=1) uniform uPosition{
+	vec2 position;
+} Position;
+
+
+void main()
+{
+	vec2 mouse = vec2(Position.position.x, Position.position.y);
+    
+    vec3 c0 = vec3(1, 1, 0.05);
+    vec3 c1 = vec3(1, passlifeTime * 0.5, 0.05);
+    vec3 c2 = vec3(passlifeTime * 0.5,passlifeTime * 0.5,0.05);
+    vec3 c3 = vec3(1, 0.05, 0.05);
+    
+    if(passlifeTime  < 1){
+        outColor = mix(c0, c1, passlifeTime );
+    }
+    else if(passlifeTime  < 2){
+        outColor = mix(c1, c2, passlifeTime  - 1);
+    }
+    else{
+        outColor = mix(c2, c3, clamp((passlifeTime  - 2) * 0.5, 0, 1));
+    }
+   
+   // make the triangle look like a circle
+   outColor *= circleFactor(passTriangleCoordinates);
+   
+   // fade out particle shortly before it dies
+   outColor *= clamp(passlifeTime * 2, 0, 1);
+}
\ No newline at end of file

projects/sph/shaders/shader_water.comp

+#version 450 core
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(local_size_x = 256) in;
+
+struct Particle
+{
+    vec3 position;
+    float lifeTime;
+    vec3 velocity;
+    float padding_2;
+    vec3 reset_velocity;
+    float padding_3;
+};
+
+layout(std430, binding = 0) readonly buffer buffer_inParticle
+{
+    Particle inParticle[];
+};
+
+layout(std430, binding = 1) writeonly buffer buffer_outParticle
+{
+    Particle outParticle[];
+};
+
+layout( push_constant ) uniform constants{
+    float deltaTime;
+    float rand;
+};
+
+vec3 attraction(vec3 pos, vec3 attractPos)
+{
+    vec3 delta = attractPos - pos;
+    const float damp = 0.5;
+    float dDampedDot = dot(delta, delta) + damp;
+    float invDist = 1.0f / sqrt(dDampedDot);
+    float invDistCubed = invDist*invDist*invDist;
+    return delta * invDistCubed * 0.0035;
+}
+
+vec3 repulsion(vec3 pos, vec3 attractPos)
+{
+    vec3 delta = attractPos - pos;
+    float targetDistance = sqrt(dot(delta, delta));
+    return delta * (1.0 / (targetDistance * targetDistance * targetDistance)) * -0.000035;
+}
+
+
+const int n = 3;
+vec3 gravity = vec3(0,-9.8,0);
+vec3 gravityPoint[n] = vec3[n](vec3(-0.5, 0.5, 0),vec3(0.5, 0.5, 0),vec3(0, -0.5, 0));
+//vec3 gravityPoint[n] = vec3[n](vec3(-0.5, 0.5, 0));
+void main() {
+    uint id = gl_GlobalInvocationID.x;
+    outParticle[id].lifeTime = inParticle[id].lifeTime - deltaTime;
+    vec3 pos = inParticle[id].position;
+    vec3 vel = inParticle[id].velocity;
+    if(inParticle[id].lifeTime < 0.f)
+    {
+        outParticle[id].lifeTime = 7.f;
+        pos = vec3(0);
+        vel = inParticle[id].reset_velocity;
+        outParticle[id].velocity = inParticle[id].reset_velocity;
+    }
+    //    inParticle[id].position += deltaTime * -normalize(max(2 - distance(inParticle[id].position,respawnPos),0.0) * respawnPos - inParticle[id].position);
+
+    for(int i = 0; i < n; i++)
+    {
+        vel += deltaTime * deltaTime * deltaTime * normalize(max(2 - distance(pos,gravityPoint[i]),0.1) * gravityPoint[i] - pos);
+    }
+
+    //vec3 delta = respawnPos - pos;
+    //float targetDistane = sqrt(dot(delta,delta));
+    //vel += repulsion(pos, respawnPos);
+
+    //if((pos.x <= -1.0) || (pos.x > 1.0) || (pos.y <= -1.0) || (pos.y > 1.0)|| (pos.z <= -1.0) || (pos.z > 1.0))
+    vel = (-vel * 0.01);
+
+    if((pos.y <= -1.0) || (pos.y > 1.0)){
+        vel = reflect(vel, vec3(0,1,0));
+    }
+
+    pos += normalize(vel) * deltaTime;
+    outParticle[id].position = pos;
+
+    float weight = 1.0;
+    float rand1 = rand;
+    outParticle[id].velocity = vel;
+}

projects/sph/shaders/shader_water.frag

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_GOOGLE_include_directive : enable
+
+#include "particleShading.inc"
+
+layout(location = 0) in vec2 passTriangleCoordinates;
+layout(location = 1) in vec3 passVelocity;
+layout(location = 2) in float passlifeTime;
+
+layout(location = 0) out vec3 outColor;
+
+layout(set=0, binding=0) uniform uColor {
+	vec4 color;
+} Color;
+
+layout(set=0,binding=1) uniform uPosition{
+	vec2 position;
+} Position;
+
+void main()
+{
+	float normlt = 1-normalize(passlifeTime);
+	vec2 mouse = vec2(Position.position.x, Position.position.y);
+    
+    vec3 c0 = vec3(0.2,0.5,1);
+    vec3 c1 = vec3(0.3, 0.7,1);
+    vec3 c2 = vec3(0.5,0.9,1);
+    vec3 c3 = vec3(0.9,1,1);
+    
+    if(passlifeTime  < 1){
+        outColor = mix(c0, c1, passlifeTime );
+    }
+    else if(passlifeTime  < 2){
+        outColor = mix(c1, c2, passlifeTime  - 1);
+    }
+    else{
+        outColor = mix(c2, c3, clamp((passlifeTime  - 2) * 0.5, 0, 1));
+    }
+    
+    // make the triangle look like a circle
+   outColor *= circleFactor(passTriangleCoordinates);
+   
+   // fade out particle shortly before it dies
+   outColor *= clamp(passlifeTime * 2, 0, 1);
+}

projects/sph/shaders/tonemapping.comp

+#version 440
+
+layout(set=0, binding=0, rgba16f)   uniform image2D inImage;
+layout(set=0, binding=1, rgba8)     uniform image2D outImage;
+
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+void main(){
+
+    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(inImage)))){
+        return;
+    }
+    ivec2 uv            = ivec2(gl_GlobalInvocationID.xy);
+    vec3 linearColor    = imageLoad(inImage, uv).rgb;
+    vec3 tonemapped     = linearColor / (dot(linearColor, vec3(0.21, 0.71, 0.08)) + 1); // reinhard tonemapping
+    vec3 gammaCorrected = pow(tonemapped, vec3(1.f / 2.2f));
+    imageStore(outImage, uv, vec4(gammaCorrected, 0.f));
+}
\ No newline at end of file

projects/sph/src/BloomAndFlares.cpp

+#include "BloomAndFlares.hpp"
+#include <vkcv/shader/GLSLCompiler.hpp>
+
+BloomAndFlares::BloomAndFlares(
+        vkcv::Core *p_Core,
+        vk::Format colorBufferFormat,
+        uint32_t width,
+        uint32_t height) :
+
+        p_Core(p_Core),
+        m_ColorBufferFormat(colorBufferFormat),
+        m_Width(width),
+        m_Height(height),
+        m_LinearSampler(p_Core->createSampler(vkcv::SamplerFilterType::LINEAR,
+                                              vkcv::SamplerFilterType::LINEAR,
+                                              vkcv::SamplerMipmapMode::LINEAR,
+                                              vkcv::SamplerAddressMode::CLAMP_TO_EDGE)),
+        m_Blur(p_Core->createImage(colorBufferFormat, width, height, 1, true, true, false)),
+        m_LensFeatures(p_Core->createImage(colorBufferFormat, width, height, 1, false, true, false))
+{
+    vkcv::shader::GLSLCompiler compiler;
+
+    // DOWNSAMPLE
+    vkcv::ShaderProgram dsProg;
+    compiler.compile(vkcv::ShaderStage::COMPUTE,
+                     "shaders/bloom/downsample.comp",
+                     [&](vkcv::ShaderStage shaderStage, const std::filesystem::path& path)
+                     {
+                         dsProg.addShader(shaderStage, path);
+                     });
+    for(uint32_t mipLevel = 0; mipLevel < m_Blur.getMipCount(); mipLevel++)
+    {
+        m_DownsampleDescSetLayouts.push_back(
+                p_Core->createDescriptorSetLayout(dsProg.getReflectedDescriptors().at(0)));
+
+		m_DownsampleDescSets.push_back(
+		        p_Core->createDescriptorSet(m_DownsampleDescSetLayouts.back()));
+    }
+    m_DownsamplePipe = p_Core->createComputePipeline(
+            dsProg, { p_Core->getDescriptorSetLayout(m_DownsampleDescSetLayouts[0]).vulkanHandle });
+
+    // UPSAMPLE
+    vkcv::ShaderProgram usProg;
+    compiler.compile(vkcv::ShaderStage::COMPUTE,
+                     "shaders/bloom/upsample.comp",
+                     [&](vkcv::ShaderStage shaderStage, const std::filesystem::path& path)
+                     {
+                         usProg.addShader(shaderStage, path);
+                     });
+    for(uint32_t mipLevel = 0; mipLevel < m_Blur.getMipCount(); mipLevel++)
+    {
+        m_UpsampleDescSetLayouts.push_back(
+                p_Core->createDescriptorSetLayout(usProg.getReflectedDescriptors().at(0)));
+        m_UpsampleDescSets.push_back(
+                p_Core->createDescriptorSet(m_UpsampleDescSetLayouts.back()));
+    }
+    m_UpsamplePipe = p_Core->createComputePipeline(
+            usProg, { p_Core->getDescriptorSetLayout(m_UpsampleDescSetLayouts[0]).vulkanHandle });
+
+    // LENS FEATURES
+    vkcv::ShaderProgram lensProg;
+    compiler.compile(vkcv::ShaderStage::COMPUTE,
+                     "shaders/bloom/lensFlares.comp",
+                     [&](vkcv::ShaderStage shaderStage, const std::filesystem::path& path)
+                     {
+                         lensProg.addShader(shaderStage, path);
+                     });
+    m_LensFlareDescSetLayout = p_Core->createDescriptorSetLayout(lensProg.getReflectedDescriptors().at(0));
+    m_LensFlareDescSet = p_Core->createDescriptorSet(m_LensFlareDescSetLayout);
+    m_LensFlarePipe = p_Core->createComputePipeline(
+            lensProg, { p_Core->getDescriptorSetLayout(m_LensFlareDescSetLayout).vulkanHandle });
+
+    // COMPOSITE
+    vkcv::ShaderProgram compProg;
+    compiler.compile(vkcv::ShaderStage::COMPUTE,
+                     "shaders/bloom/composite.comp",
+                     [&](vkcv::ShaderStage shaderStage, const std::filesystem::path& path)
+                     {
+                         compProg.addShader(shaderStage, path);
+                     });
+    m_CompositeDescSetLayout = p_Core->createDescriptorSetLayout(compProg.getReflectedDescriptors().at(0));
+    m_CompositeDescSet = p_Core->createDescriptorSet(m_CompositeDescSetLayout);
+    m_CompositePipe = p_Core->createComputePipeline(
+            compProg, { p_Core->getDescriptorSetLayout(m_CompositeDescSetLayout).vulkanHandle });
+}
+
+void BloomAndFlares::execDownsamplePipe(const vkcv::CommandStreamHandle &cmdStream,
+                                        const vkcv::ImageHandle &colorAttachment)
+{
+    auto dispatchCountX  = static_cast<float>(m_Width)  / 8.0f;
+    auto dispatchCountY = static_cast<float>(m_Height) / 8.0f;
+    // blur dispatch
+    uint32_t initialDispatchCount[3] = {
+            static_cast<uint32_t>(glm::ceil(dispatchCountX)),
+            static_cast<uint32_t>(glm::ceil(dispatchCountY)),
+            1
+    };
+
+    // downsample dispatch of original color attachment
+    p_Core->prepareImageForSampling(cmdStream, colorAttachment);
+    p_Core->prepareImageForStorage(cmdStream, m_Blur.getHandle());
+
+    vkcv::DescriptorWrites initialDownsampleWrites;
+    initialDownsampleWrites.sampledImageWrites = {vkcv::SampledImageDescriptorWrite(0, colorAttachment)};
+    initialDownsampleWrites.samplerWrites      = {vkcv::SamplerDescriptorWrite(1, m_LinearSampler)};
+    initialDownsampleWrites.storageImageWrites = {vkcv::StorageImageDescriptorWrite(2, m_Blur.getHandle(), 0) };
+    p_Core->writeDescriptorSet(m_DownsampleDescSets[0], initialDownsampleWrites);
+
+    p_Core->recordComputeDispatchToCmdStream(
+            cmdStream,
+            m_DownsamplePipe,
+            initialDispatchCount,
+            {vkcv::DescriptorSetUsage(0, p_Core->getDescriptorSet(m_DownsampleDescSets[0]).vulkanHandle)},
+            vkcv::PushConstants(0));
+
+    // downsample dispatches of blur buffer's mip maps
+    float mipDispatchCountX = dispatchCountX;
+    float mipDispatchCountY = dispatchCountY;
+    for(uint32_t mipLevel = 1; mipLevel < std::min((uint32_t)m_DownsampleDescSets.size(), m_Blur.getMipCount()); mipLevel++)
+    {
+        // mip descriptor writes
+        vkcv::DescriptorWrites mipDescriptorWrites;
+        mipDescriptorWrites.sampledImageWrites = {vkcv::SampledImageDescriptorWrite(0, m_Blur.getHandle(), mipLevel - 1, true)};
+        mipDescriptorWrites.samplerWrites      = {vkcv::SamplerDescriptorWrite(1, m_LinearSampler)};
+        mipDescriptorWrites.storageImageWrites = {vkcv::StorageImageDescriptorWrite(2, m_Blur.getHandle(), mipLevel) };
+        p_Core->writeDescriptorSet(m_DownsampleDescSets[mipLevel], mipDescriptorWrites);
+
+        // mip dispatch calculation
+        mipDispatchCountX  /= 2.0f;
+        mipDispatchCountY /= 2.0f;
+
+        uint32_t mipDispatchCount[3] = {
+                static_cast<uint32_t>(glm::ceil(mipDispatchCountX)),
+                static_cast<uint32_t>(glm::ceil(mipDispatchCountY)),
+                1
+        };
+
+        if(mipDispatchCount[0] == 0)
+            mipDispatchCount[0] = 1;
+        if(mipDispatchCount[1] == 0)
+            mipDispatchCount[1] = 1;
+
+        // mip blur dispatch
+        p_Core->recordComputeDispatchToCmdStream(
+                cmdStream,
+                m_DownsamplePipe,
+                mipDispatchCount,
+                {vkcv::DescriptorSetUsage(0, p_Core->getDescriptorSet(m_DownsampleDescSets[mipLevel]).vulkanHandle)},
+                vkcv::PushConstants(0));
+
+        // image barrier between mips
+        p_Core->recordImageMemoryBarrier(cmdStream, m_Blur.getHandle());
+    }
+}
+
+void BloomAndFlares::execUpsamplePipe(const vkcv::CommandStreamHandle &cmdStream)
+{
+    // upsample dispatch
+    p_Core->prepareImageForStorage(cmdStream, m_Blur.getHandle());
+
+    const uint32_t upsampleMipLevels = std::min(
+    		static_cast<uint32_t>(m_UpsampleDescSets.size() - 1),
+    		static_cast<uint32_t>(3)
+	);
+
+    // upsample dispatch for each mip map
+    for(uint32_t mipLevel = upsampleMipLevels; mipLevel > 0; mipLevel--)
+    {
+        // mip descriptor writes
+        vkcv::DescriptorWrites mipUpsampleWrites;
+        mipUpsampleWrites.sampledImageWrites = {vkcv::SampledImageDescriptorWrite(0, m_Blur.getHandle(), mipLevel, true)};
+        mipUpsampleWrites.samplerWrites      = {vkcv::SamplerDescriptorWrite(1, m_LinearSampler)};
+        mipUpsampleWrites.storageImageWrites = {vkcv::StorageImageDescriptorWrite(2, m_Blur.getHandle(), mipLevel - 1) };
+        p_Core->writeDescriptorSet(m_UpsampleDescSets[mipLevel], mipUpsampleWrites);
+
+        auto mipDivisor = glm::pow(2.0f, static_cast<float>(mipLevel) - 1.0f);
+
+        auto upsampleDispatchX  = static_cast<float>(m_Width) / mipDivisor;
+        auto upsampleDispatchY = static_cast<float>(m_Height) / mipDivisor;
+        upsampleDispatchX /= 8.0f;
+        upsampleDispatchY /= 8.0f;
+
+        const uint32_t upsampleDispatchCount[3] = {
+                static_cast<uint32_t>(glm::ceil(upsampleDispatchX)),
+                static_cast<uint32_t>(glm::ceil(upsampleDispatchY)),
+                1
+        };
+
+        p_Core->recordComputeDispatchToCmdStream(
+                cmdStream,
+                m_UpsamplePipe,
+                upsampleDispatchCount,
+                {vkcv::DescriptorSetUsage(0, p_Core->getDescriptorSet(m_UpsampleDescSets[mipLevel]).vulkanHandle)},
+                vkcv::PushConstants(0)
+        );
+        // image barrier between mips
+        p_Core->recordImageMemoryBarrier(cmdStream, m_Blur.getHandle());
+    }
+}
+
+void BloomAndFlares::execLensFeaturePipe(const vkcv::CommandStreamHandle &cmdStream)
+{
+    // lens feature generation descriptor writes
+    p_Core->prepareImageForSampling(cmdStream, m_Blur.getHandle());
+    p_Core->prepareImageForStorage(cmdStream, m_LensFeatures.getHandle());
+
+    vkcv::DescriptorWrites lensFeatureWrites;
+    lensFeatureWrites.sampledImageWrites = {vkcv::SampledImageDescriptorWrite(0, m_Blur.getHandle(), 0)};
+    lensFeatureWrites.samplerWrites = {vkcv::SamplerDescriptorWrite(1, m_LinearSampler)};
+    lensFeatureWrites.storageImageWrites = {vkcv::StorageImageDescriptorWrite(2, m_LensFeatures.getHandle(), 0)};
+    p_Core->writeDescriptorSet(m_LensFlareDescSet, lensFeatureWrites);
+
+    auto dispatchCountX  = static_cast<float>(m_Width)  / 8.0f;
+    auto dispatchCountY = static_cast<float>(m_Height) / 8.0f;
+    // lens feature generation dispatch
+    uint32_t lensFeatureDispatchCount[3] = {
+            static_cast<uint32_t>(glm::ceil(dispatchCountX)),
+            static_cast<uint32_t>(glm::ceil(dispatchCountY)),
+            1
+    };
+    p_Core->recordComputeDispatchToCmdStream(
+            cmdStream,
+            m_LensFlarePipe,
+            lensFeatureDispatchCount,
+            {vkcv::DescriptorSetUsage(0, p_Core->getDescriptorSet(m_LensFlareDescSet).vulkanHandle)},
+            vkcv::PushConstants(0));
+}
+
+void BloomAndFlares::execCompositePipe(const vkcv::CommandStreamHandle &cmdStream,
+                                       const vkcv::ImageHandle &colorAttachment)
+{
+    p_Core->prepareImageForSampling(cmdStream, m_Blur.getHandle());
+    p_Core->prepareImageForSampling(cmdStream, m_LensFeatures.getHandle());
+    p_Core->prepareImageForStorage(cmdStream, colorAttachment);
+
+    // bloom composite descriptor write
+    vkcv::DescriptorWrites compositeWrites;
+    compositeWrites.sampledImageWrites = {vkcv::SampledImageDescriptorWrite(0, m_Blur.getHandle()),
+                                          vkcv::SampledImageDescriptorWrite(1, m_LensFeatures.getHandle())};
+    compositeWrites.samplerWrites = {vkcv::SamplerDescriptorWrite(2, m_LinearSampler)};
+    compositeWrites.storageImageWrites = {vkcv::StorageImageDescriptorWrite(3, colorAttachment)};
+    p_Core->writeDescriptorSet(m_CompositeDescSet, compositeWrites);
+
+    float dispatchCountX = static_cast<float>(m_Width)  / 8.0f;
+    float dispatchCountY = static_cast<float>(m_Height) / 8.0f;
+
+    uint32_t compositeDispatchCount[3] = {
+            static_cast<uint32_t>(glm::ceil(dispatchCountX)),
+            static_cast<uint32_t>(glm::ceil(dispatchCountY)),
+            1
+    };
+
+    // bloom composite dispatch
+    p_Core->recordComputeDispatchToCmdStream(
+            cmdStream,
+            m_CompositePipe,
+            compositeDispatchCount,
+            {vkcv::DescriptorSetUsage(0, p_Core->getDescriptorSet(m_CompositeDescSet).vulkanHandle)},
+            vkcv::PushConstants(0));
+}
+
+void BloomAndFlares::execWholePipeline(const vkcv::CommandStreamHandle &cmdStream,
+                                       const vkcv::ImageHandle &colorAttachment)
+{
+    execDownsamplePipe(cmdStream, colorAttachment);
+    execUpsamplePipe(cmdStream);
+    execLensFeaturePipe(cmdStream);
+    execCompositePipe(cmdStream, colorAttachment);
+}
+
+void BloomAndFlares::updateImageDimensions(uint32_t width, uint32_t height)
+{
+    if ((width == m_Width) && (height == m_Height)) {
+        return;
+    }
+    
+    m_Width  = width;
+    m_Height = height;
+
+    p_Core->getContext().getDevice().waitIdle();
+    m_Blur = p_Core->createImage(m_ColorBufferFormat, m_Width, m_Height, 1, true, true, false);
+    m_LensFeatures = p_Core->createImage(m_ColorBufferFormat, m_Width, m_Height, 1, false, true, false);
+}
+
+

projects/sph/src/BloomAndFlares.hpp

+#pragma once
+#include <vkcv/Core.hpp>
+#include <glm/glm.hpp>
+
+class BloomAndFlares{
+public:
+    BloomAndFlares(vkcv::Core *p_Core,
+                   vk::Format colorBufferFormat,
+                   uint32_t width,
+                   uint32_t height);
+
+    void execWholePipeline(const vkcv::CommandStreamHandle &cmdStream, const vkcv::ImageHandle &colorAttachment);
+
+    void updateImageDimensions(uint32_t width, uint32_t height);
+
+private:
+    vkcv::Core *p_Core;
+
+    vk::Format m_ColorBufferFormat;
+    uint32_t m_Width;
+    uint32_t m_Height;
+
+    vkcv::SamplerHandle m_LinearSampler;
+    vkcv::Image m_Blur;
+    vkcv::Image m_LensFeatures;
+
+
+    vkcv::PipelineHandle                            m_DownsamplePipe;
+    std::vector<vkcv::DescriptorSetLayoutHandle>    m_DownsampleDescSetLayouts;
+    std::vector<vkcv::DescriptorSetHandle>          m_DownsampleDescSets; // per mip desc set
+
+    vkcv::PipelineHandle                            m_UpsamplePipe;
+    std::vector<vkcv::DescriptorSetLayoutHandle>    m_UpsampleDescSetLayouts;
+    std::vector<vkcv::DescriptorSetHandle>          m_UpsampleDescSets;   // per mip desc set
+
+    vkcv::PipelineHandle                            m_LensFlarePipe;
+    vkcv::DescriptorSetLayoutHandle                 m_LensFlareDescSetLayout;
+    vkcv::DescriptorSetHandle                       m_LensFlareDescSet;
+
+    vkcv::PipelineHandle                            m_CompositePipe;
+    vkcv::DescriptorSetLayoutHandle                 m_CompositeDescSetLayout;
+    vkcv::DescriptorSetHandle                       m_CompositeDescSet;
+
+    void execDownsamplePipe(const vkcv::CommandStreamHandle &cmdStream, const vkcv::ImageHandle &colorAttachment);
+    void execUpsamplePipe(const vkcv::CommandStreamHandle &cmdStream);
+    void execLensFeaturePipe(const vkcv::CommandStreamHandle &cmdStream);
+    void execCompositePipe(const vkcv::CommandStreamHandle &cmdStream, const vkcv::ImageHandle &colorAttachment);
+};
+
+
+

projects/sph/src/Particle.cpp

+
+#include "Particle.hpp"
+
+Particle::Particle(glm::vec3 position, glm::vec3 velocity, float lifeTime)
+: m_position(position),
+  m_lifeTime(lifeTime),
+  m_velocity(velocity),
+  m_mass(1.0f),
+  m_reset_velocity(velocity)
+{}
+
+const glm::vec3& Particle::getPosition()const{
+    return m_position;
+}
+
+bool Particle::isAlive()const{
+    return m_lifeTime > 0.f;
+}
+
+void Particle::setPosition( const glm::vec3 pos ){
+    m_position = pos;
+}
+
+const glm::vec3& Particle::getVelocity()const{
+    return m_velocity;
+}
+
+void Particle::setVelocity( const glm::vec3 vel ){
+    m_velocity = vel;
+}
+
+void Particle::update( const float delta ){
+    m_position += m_velocity * delta;
+}
+
+void Particle::setLifeTime( const float lifeTime ){
+    m_lifeTime = lifeTime;
+}
+
+const float& Particle::getLifeTime()const{
+    return m_lifeTime;
+}
\ No newline at end of file

projects/sph/src/Particle.hpp

+#pragma once
+
+#include <glm/glm.hpp>
+
+class Particle {
+
+public:
+    Particle(glm::vec3 position, glm::vec3 velocity, float lifeTime = 1.f);
+
+    const glm::vec3& getPosition()const;
+
+    void setPosition( const glm::vec3 pos );
+
+    const glm::vec3& getVelocity()const;
+
+    void setVelocity( const glm::vec3 vel );
+
+    void update( const float delta );
+
+    bool isAlive()const;
+
+    void setLifeTime( const float lifeTime );
+
+    const float& getLifeTime()const;
+
+private:
+    // all properties of the Particle
+    glm::vec3 m_position;
+    float m_lifeTime;
+    glm::vec3 m_velocity;
+    float m_mass;
+    glm::vec3 m_reset_velocity;
+    float padding_3;
+};

projects/sph/src/ParticleSystem.cpp

+#include "ParticleSystem.hpp"
+
+ParticleSystem::ParticleSystem(uint32_t particleCount ,glm::vec3 minVelocity , glm::vec3 maxVelocity , glm::vec2 lifeTime )
+{
+    m_rdmVel.resize(3);
+    m_rdmVel[0] = std::uniform_real_distribution<float>(minVelocity.x, maxVelocity.x);
+    m_rdmVel[1] = std::uniform_real_distribution<float>(minVelocity.y, maxVelocity.y);
+    m_rdmVel[2] = std::uniform_real_distribution<float>(minVelocity.z, maxVelocity.z);
+    m_rdmLifeTime = std::uniform_real_distribution<float>(lifeTime.x, lifeTime.y);
+
+    for(uint32_t i = 0; i < particleCount ;i++ ){
+        addParticle(Particle(m_respawnPos, getRandomVelocity(), getRandomLifeTime()));
+    }
+}
+
+const std::vector<Particle>& ParticleSystem::getParticles() const{
+    return m_particles;
+}
+
+void ParticleSystem::addParticle( const Particle particle ){
+    m_particles.push_back(particle);
+}
+void ParticleSystem::addParticles( const std::vector<Particle> particles ){
+    m_particles.insert(m_particles.end(), particles.begin(), particles.end());
+}
+
+void ParticleSystem::updateParticles( const float deltaTime ){
+    for(Particle& particle :m_particles){
+        bool alive = particle.isAlive();
+        particle.setPosition( particle.getPosition() * static_cast<float>(alive) + static_cast<float>(!alive) * m_respawnPos );
+        particle.setVelocity( particle.getVelocity() * static_cast<float>(alive) + static_cast<float>(!alive) *  getRandomVelocity());
+        particle.setLifeTime( (particle.getLifeTime() * alive + !alive * getRandomLifeTime() ) - deltaTime );
+        particle.update(deltaTime);
+    }
+}
+
+glm::vec3 ParticleSystem::getRandomVelocity(){
+    return glm::vec3(m_rdmVel[0](m_rdmEngine), m_rdmVel[1](m_rdmEngine),m_rdmVel[2](m_rdmEngine));
+}
+
+float ParticleSystem::getRandomLifeTime(){
+    return m_rdmLifeTime(m_rdmEngine);
+}
+
+void ParticleSystem::setRespawnPos( const glm::vec3 respawnPos){
+    m_respawnPos = respawnPos;
+}
+void ParticleSystem::setRdmLifeTime( const glm::vec2 lifeTime ){
+    m_rdmLifeTime = std::uniform_real_distribution<float> (lifeTime.x,lifeTime.y);
+}
+
+void ParticleSystem::setRdmVelocity( glm::vec3 minVelocity, glm::vec3 maxVelocity ){
+    m_rdmVel[0] = std::uniform_real_distribution<float> (minVelocity.x,maxVelocity.x);
+    m_rdmVel[1] = std::uniform_real_distribution<float> (minVelocity.y,maxVelocity.y);
+    m_rdmVel[2] = std::uniform_real_distribution<float> (minVelocity.z,maxVelocity.z);
+}
+
+const glm::vec3 ParticleSystem::getRespawnPos() const{
+    return m_respawnPos;
+}