niklas/rwu_particles_informatikprojekt
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Niklas Birk 2020-03-13 17:11:07 +01:00
parent 92a3dc0813
commit 1b5b6d0f45
3 changed files with 96 additions and 73 deletions
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129
main.c
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@ -6,6 +6,10 @@
#include "particlesystem.h" #include "particlesystem.h"
#include "initOpenGL.h" #include "initOpenGL.h"
#define PARTICLE_AMOUNT 10000
#define WIDTH 800
#define HEIGHT 800
void printVector(vector3f *v); void printVector(vector3f *v);
void printParticle(particle *v); void printParticle(particle *v);
void printEmitter(emitter *e); void printEmitter(emitter *e);
@ -17,14 +21,13 @@ void calcCol(particle *p);
int main() int main()
{ {
/************* INIT *************/ /************* INIT *************/
// Init OpenGL and GLFW // Init OpenGL and GLFW
initGLFW(); initGLFW();
setErrorCallbackGL(); setErrorCallbackGL();
int width = 800, height = 800; int width = WIDTH, height = HEIGHT;
GLFWwindow *window = createGLFWWindow(width, height, "Informatikprojekt - OpenGL"); GLFWwindow *window = createGLFWWindow(WIDTH, HEIGHT, "Informatikprojekt - OpenGL");
setCurrentContextGL(window); setCurrentContextGL(window);
setFramebufferSizeCallbackGL(window); setFramebufferSizeCallbackGL(window);
@ -33,15 +36,16 @@ int main()
initGlad(); initGlad();
/************* PARTICLE SYSTEM *************/ /************* PARTICLE SYSTEM *************/
int particleAmount = 10000;
vector3f *epos1 = initVector3f(0, 0, 0); vector3f *epos1 = initVector3f(0, 0, 0);
emitter *e1 = initEmitter(epos1, particleAmount); emitter *e1 = initEmitter(epos1, PARTICLE_AMOUNT);
particle_system *ps = initParticleSystem(1); particle_system *ps = initParticleSystem(1);
(ps->emitters)[0] = e1; (ps->emitters)[0] = e1;
initRandomParticles(e1); initRandomParticles(e1);
/************* SHADER *************/ /************* SHADER *************/
const GLchar *computeShaderSource = "#version 460\n" const GLchar *computeShaderSource = "#version 460 core\n"
"#extension GL_ARB_compute_shader : enable\n"
"#extension GL_ARB_shader_storage_buffer_object : enable\n"
"\n" "\n"
"struct particle\n" "struct particle\n"
"{\n" "{\n"
@ -57,22 +61,48 @@ int main()
"};\n" "};\n"
"\n" "\n"
"uniform float dt;\n" "uniform float dt;\n"
"uniform vec3 resetPos;\n"
"uniform uint seed;\n"
"\n" "\n"
"layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in;\n" "layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in;\n"
"\n" "\n"
"float rand()\n"
"{\n"
" uint seedR;\n"
" seedR = (seed * 1103515245u + 12345u);\n"
" return float(seed) / 4294967296.0;\n"
"}\n"
"\n"
"vec3 rand3() {\n"
" vec3 result;\n"
" uint seedR;\n"
" seedR = (seed * 1103515245u + 12345u);\n"
" result.x = float(seed);\n"
" seedR = (seed * 1103515245u + 12345u);\n"
" result.y = float(seed);\n"
" seedR = (seed * 1103515245u + 12345u);\n"
" result.z = float(seed);\n"
" return (result / 2147483648.0) - vec3(1,1,1);\n"
"}\n"
"\n"
"void main()\n" "void main()\n"
"{\n" "{\n"
" uint gid = gl_GlobalInvocationID.x;\n" " uint gid = gl_GlobalInvocationID.x;\n"
" particle part = p[gid];\n" " particle part = p[gid];\n"
"\n" "\n"
" if (part.age > 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1)\n" " if (part.age < 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1\n"
" || part.pos.x < -1 || part.pos.y < -1 || part.pos.z < -1 )\n"
" {\n" " {\n"
" part.pos += part.vel * dt;\n" " part.pos = resetPos;\n"
" part.age -= 0.01f;\n" " //part.vel = rand3();\n"
" //part.col = vec3(rand(), rand(), rand());\n"
" //part.age = rand() * 0x7fff * 0.01f;\n"
" \n"
" }\n" " }\n"
" else\n" " else\n"
" {\n" " {\n"
" part.pos = vec3(0, 0, 0);\n" " part.pos += part.vel * dt;\n"
" part.age -= 0.01f;\n"
" }\n" " }\n"
"\n" "\n"
" p[gid] = part;\n" " p[gid] = part;\n"
@ -83,49 +113,38 @@ int main()
"layout(location = 0) in vec3 pos;\n" "layout(location = 0) in vec3 pos;\n"
"layout(location = 1) in vec3 colIn;\n" "layout(location = 1) in vec3 colIn;\n"
"\n" "\n"
"//out vec3 colV;\n" "out vec3 colV;\n"
"\n" "\n"
"void main(void)\n" "void main(void)\n"
"{\n" "{\n"
" //colV = colIn;\n" " colV = colIn;\n"
" gl_Position = vec4(pos, 0);\n" " gl_Position = vec4(pos, 1);\n"
"}"; "}";
// const GLchar *geometryShaderSource = "#version 460 core\n" const GLchar *fragmentShaderSource = "#version 460 core\n"
// "\n" "\n"
// "layout(points) in;\n" "in vec3 colV;\n"
// "layout(points, max_vertices = 256) out;\n" "out vec4 colOut;\n"
// "\n" "\n"
// "in vec3 colV;\n" "void main(void)\n"
// "out vec3 colG;\n" "{\n"
// "\n" " colOut = vec4(colV, 1);\n"
// "void main(void)\n" "}";
// "{\n"
// " colG = colV;\n"
// "}";
// const GLchar *fragmentShaderSource = "#version 460 core\n"
// "\n"
// "in vec3 colG;\n"
// "out vec4 colOut;\n"
// "\n"
// "void main(void)\n"
// "{\n"
// " colOut = vec4(colG, 1);\n"
// "}";
GLuint computeShader = compileShader(computeShaderSource, GL_COMPUTE_SHADER); GLuint computeShader = compileShader(computeShaderSource, GL_COMPUTE_SHADER);
GLuint vertexShader = compileShader(vertexShaderSource, GL_VERTEX_SHADER); GLuint vertexShader = compileShader(vertexShaderSource, GL_VERTEX_SHADER);
// GLuint geometryShader = compileShader(geometryShaderSource, GL_GEOMETRY_SHADER); GLuint fragmentShader = compileShader(fragmentShaderSource, GL_FRAGMENT_SHADER);
// GLuint fragmentShader = compileShader(fragmentShaderSource, GL_FRAGMENT_SHADER);
GLuint computeShaders[] = { computeShader }; GLuint computeShaders[] = { computeShader };
GLuint computeShaderProgram = linkShaders(computeShaders, 1); GLuint computeShaderProgram = linkShaders(computeShaders, 1);
glUseProgram(computeShaderProgram); glUseProgram(computeShaderProgram);
GLint dtUniformLocation = glGetUniformLocation(computeShaderProgram, "dt"); GLint dtUniformLocation = glGetUniformLocation(computeShaderProgram, "dt");
GLint resetPosUniformLocation = glGetUniformLocation(computeShaderProgram, "resetPos");
GLint seedUniformLocation = glGetUniformLocation(computeShaderProgram, "seed");
glUniform3f(resetPosUniformLocation, e1->position->x, e1->position->y, e1->position->z);
GLuint renderShaders[] = { vertexShader/*, geometryShader, fragmentShader*/ }; GLuint renderShaders[] = { vertexShader, fragmentShader };
GLuint renderShaderProgram = linkShaders(renderShaders, 1/*3*/); GLuint renderShaderProgram = linkShaders(renderShaders, 2);
float *particles = serializeParticlesystem(ps); float *particles = serializeParticlesystem(ps);
GLsizeiptr sizeOfParticle = 3 * sizeof(vector3f) + sizeof(float); GLsizeiptr sizeOfParticle = 3 * sizeof(vector3f) + sizeof(float);
@ -133,7 +152,7 @@ int main()
GLuint particleBuffer; GLuint particleBuffer;
glGenBuffers(1, &particleBuffer); glGenBuffers(1, &particleBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, particleBuffer); glBindBuffer(GL_SHADER_STORAGE_BUFFER, particleBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, particleAmount * sizeOfParticle, particles, GL_STATIC_DRAW); glBufferData(GL_SHADER_STORAGE_BUFFER, PARTICLE_AMOUNT * sizeOfParticle, particles, GL_STATIC_DRAW);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, particleBuffer); glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, particleBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0); glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
@ -161,46 +180,24 @@ int main()
/*** UPDATE ***/ /*** UPDATE ***/
glUseProgram(computeShaderProgram); glUseProgram(computeShaderProgram);
glUniform1f(dtUniformLocation, tFrame); glUniform1f(dtUniformLocation, tFrame);
glDispatchCompute((particleAmount / 256) + 1, 1, 1); glUniform1ui(seedUniformLocation, rand());
glDispatchCompute((PARTICLE_AMOUNT / 256) + 1, 1, 1);
glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT | GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT); glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT | GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT);
/*** RENDER ***/ /*** RENDER ***/
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glfwGetFramebufferSize(window, &width, &height); glfwGetFramebufferSize(window, &width, &height);
glColor3f(1, 1, 1);
glBindVertexArray(vertexArray); glBindVertexArray(vertexArray);
glUseProgram(renderShaderProgram); glUseProgram(renderShaderProgram);
glDrawArrays(GL_POINTS, 0, particleAmount); glDrawArrays(GL_POINTS, 0, PARTICLE_AMOUNT);
glBindVertexArray(0); glBindVertexArray(0);
// glClear(GL_COLOR_BUFFER_BIT);
// glfwGetFramebufferSize(window, &width, &height);
// updateParticles((float) tFrame, ps, calcPos, calcCol);
//
// emitter *e;
// particle *p;
// vector3f *pos;
// for (int j = 0; j < ps->eamount; j++)
// {
// e = (ps->emitters)[j];
// for (int i = 0; i < e->pamount; i++)
// {
// p = (e->particles)[i];
// pos = p->position;
// glColor3f(p->color->x, p->color->y, p->color->z);
// glBegin(GL_POINTS);
// glVertex3f(pos->x, pos->y, pos->z);
// glEnd();
// }
// }
glfwSwapBuffers(window); glfwSwapBuffers(window);
glfwPollEvents(); glfwPollEvents();
} }
//END //END
deleteShaders(renderShaders, 3); deleteShaders(renderShaders, 2);
deleteShaders(computeShaders, 1); deleteShaders(computeShaders, 1);
terminateGLFW(window); terminateGLFW(window);

36
shaders/ComputeShader.glsl
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@ -16,23 +16,49 @@ layout(std430, binding = 0) buffer particles
}; };
uniform float dt; uniform float dt;
uniform vec3 resetPos;
uniform uint seed;
layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in; layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
float rand()
{
uint seedR;
seedR = (seed * 1103515245u + 12345u);
return float(seed) / 4294967296.0;
}
vec3 rand3() {
vec3 result;
uint seedR;
seedR = (seed * 1103515245u + 12345u);
result.x = float(seed);
seedR = (seed * 1103515245u + 12345u);
result.y = float(seed);
seedR = (seed * 1103515245u + 12345u);
result.z = float(seed);
return (result / 2147483648.0) - vec3(1,1,1);
}
void main() void main()
{ {
uint gid = gl_GlobalInvocationID.x; uint gid = gl_GlobalInvocationID.x;
particle part = p[gid]; particle part = p[gid];
if (part.age > 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1) if (part.age < 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1
|| part.pos.x < -1 || part.pos.y < -1 || part.pos.z < -1 )
{
part.pos = resetPos;
part.vel = rand3();
part.col = vec3(rand(), rand(), rand());
part.age = rand() * 0x7fff * 0.01f;
}
else
{ {
part.pos += part.vel * dt; part.pos += part.vel * dt;
part.age -= 0.01f; part.age -= 0.01f;
} }
else
{
part.pos = vec3(0, 0, 0);
}
p[gid] = part; p[gid] = part;
} }

2
shaders/VertexShader.glsl
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@ -8,5 +8,5 @@ out vec3 colV;
void main(void) void main(void)
{ {
colV = colIn; colV = colIn;
gl_Position = vec4(pos, 0); gl_Position = vec4(pos, 1);
} }