joshua
/
attractor-cl
Archived
1
0
Fork 0
Code Releases Activity
Browse Source

Lorenz Attractor with parameters

master
Joshua Moerman 11 years ago
parent
e79a0ea7b5
commit
1fc2b41631
6 changed files with 53 additions and 149 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 78
      lib/app.cpp
  2. 21
      lib/app.hpp
  3. 8
      resources/Fractal.fsh
  4. 9
      resources/Fractal.vsh
  5. 74
      resources/Kernel.cl
  6. 12
      src/main.cpp

78
lib/app.cpp
View File

@ -6,13 +6,18 @@
using namespace std;
static const std::vector<Vertex> quad = {{
// x y z u v
{{ 1, -1, 0}, {1, 0}},
{{-1, -1, 0}, {0, 0}},
{{ 1, 1, 0}, {1, 1}},
{{-1, 1, 0}, {0, 1}}
}};
static std::vector<Vertex> generate_random_points(size_t N){
std::vector<Vertex> ret(N);
const float d = 0.1;
for(auto& x : ret){
x[0] = d * rand() / float(RAND_MAX);
x[1] = d * rand() / float(RAND_MAX);
x[2] = d * rand() / float(RAND_MAX);
}
return ret;
}
enum {
POS_ATTR,
@ -20,81 +25,47 @@ enum {
};
App::App(GLContext& gl_context)
: gl_image1(create_gl_texture(W, H))
, gl_image2(create_gl_texture(W, H))
, gl_vbo(create_vbo(quad))
: gl_vbo(create_vbo(generate_random_points(N)))
, gl_vao(create_vao(gl_vbo))
, gl_program(create_shader_from_files("Fractal.vsh", "Fractal.fsh"))
, cl_context(create_shared_cl_context(gl_context))
, cl_device(cl_context.getInfo<CL_CONTEXT_DEVICES>().front())
, cl_queue(cl_context, cl_device)
, cl_image1(cl_context, CL_MEM_READ_WRITE, GL_TEXTURE_2D, 0, gl_image1)
, cl_image2(cl_context, CL_MEM_READ_WRITE, GL_TEXTURE_2D, 0, gl_image2)
, cl_buffer(cl_context, 0, gl_vbo.id)
, cl_program(create_cl_program("Kernel.cl"))
, k_initialize(cl_program, "initialize")
, k_hblur(cl_program, "hblur")
, k_vblur(cl_program, "vblur")
, k_update(cl_program, "update")
{
cl::checky(k_initialize(cl_queue, W, H, W, H, cl_image1));
cl::checky(k_initialize(cl_queue, W, H, W, H, cl_image2));
moggle::gl::clear_color(0.0f, 0.0f, 0.0f, 1.0f);
moggle::gl::enable(GL_BLEND);
moggle::gl::blend_function(GL_ONE, GL_ONE);
moggle::gl::blend_equation(GL_FUNC_ADD);
}
void App::draw(){
GLuint* gl_images[] = {&gl_image1, &gl_image2};
cl::ImageGL* cl_images[] = {&cl_image1, &cl_image2};
auto dt = 1/60.0;
time += dt;
if(wait > 0) wait -= dt;
if(wait <= 0){
bool blur = false;
if((frame / 200) % 2) blur = true;
if(blur){
frame += 4;
cl::checky(k_hblur(cl_queue, W, H, W, H, *cl_images[(frame + 1) % 2], *cl_images[frame % 2]));
cl::checky(k_vblur(cl_queue, W, H, W, H, *cl_images[frame % 2], *cl_images[(frame + 1) % 2]));
} else {
frame++;
cl::checky(k_update(cl_queue, W, H, W, H, *cl_images[(frame + 1) % 2], *cl_images[frame % 2]));
}
k_update(cl_queue, N, p_s, p_r, p_b, p_dt, cl_buffer);
}
cl::checky(cl_queue.finish());
moggle::gl::clear_color(0.35f, 0.65f, 0.65f, 1.0f);
moggle::gl::clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gl_program.use();
moggle::gl::bind_texture(GL_TEXTURE_2D, *gl_images[frame % 2]);
gl_program.uniform<GLint>("tex").set(0);
gl_vao.bind();
moggle::gl::draw_arrays(GL_TRIANGLE_STRIP, 0, 4);
moggle::gl::draw_arrays(GL_POINTS, 0, N);
}
void App::resize(size_t w, size_t h){
wait = 2;
wait = 5;
W = w;
H = h;
gl_image1 = create_gl_texture(W, H);
gl_image2 = create_gl_texture(W, H);
cl_int err = 0;
cl_image1 = cl::ImageGL(cl_context, CL_MEM_READ_WRITE, GL_TEXTURE_2D, 0, gl_image1, &err);
cl::checky(err);
cl_image2 = cl::ImageGL(cl_context, CL_MEM_READ_WRITE, GL_TEXTURE_2D, 0, gl_image2, &err);
cl::checky(err);
std::cout << cl_image1 << std::endl;
cl::checky(k_initialize(cl_queue, W, H, W, H, cl_image1));
cl::checky(k_initialize(cl_queue, W, H, W, H, cl_image2));
}
moggle::shader_program App::create_shader_from_files(string vertex, string fragment){
@ -107,7 +78,6 @@ moggle::shader_program App::create_shader_from_files(string vertex, string fragm
program.attach(fs);
program.bind_attribute(POS_ATTR, "position");
program.bind_attribute(TEX_ATTR, "tex_coord");
program.link();
@ -126,10 +96,8 @@ moggle::vao App::create_vao(const moggle::vbo<Vertex>& vbo){
vao.bind();
moggle::gl::enable_vertex_attribute_array(POS_ATTR);
moggle::gl::enable_vertex_attribute_array(TEX_ATTR);
vao.attribute(POS_ATTR, vbo, &Vertex::position);
vao.attribute(TEX_ATTR, vbo, &Vertex::tex_coord);
vao.attribute(POS_ATTR, vbo);
return vao;
}

21
lib/app.hpp
View File

@ -8,25 +8,24 @@
#include <cl2.hpp>
#include <NSGLWrapper.hpp>
struct Vertex{
moggle::vector3<GLfloat> position;
moggle::vector2<GLfloat> tex_coord;
};
using Vertex = moggle::hvector4<GLfloat>;
struct App {
size_t W = 128;
size_t H = 128;
size_t N = 1 << 20;
float time = 0;
float wait = 2;
size_t frame = 0;
float wait = 5;
float p_s = 10.962073;
float p_r = 31.211250;
float p_b = 1.537946;
float p_dt = 0.013040;
App(GLContext & gl_context);
void draw();
void resize(size_t w, size_t h);
private:
GLuint gl_image1;
GLuint gl_image2;
moggle::vbo<Vertex> gl_vbo;
moggle::vao gl_vao;
moggle::shader_program gl_program;
@ -34,12 +33,8 @@ private:
cl::Context cl_context;
cl::Device cl_device;
cl::CommandQueue cl_queue;
cl::ImageGL cl_image1;
cl::ImageGL cl_image2;
cl::BufferGL cl_buffer;
cl::Program cl_program;
KernelOp k_initialize;
KernelOp k_hblur;
KernelOp k_vblur;
KernelOp k_update;
static moggle::shader_program create_shader_from_files(std::string vertex, std::string fragment);

8
resources/Fractal.fsh
View File

@ -1,12 +1,8 @@
#version 330
uniform sampler2D tex;
in vec2 tex_coord_int;
out vec4 fragColor;
in float mx;
void main(){
// fragColor = texture(tex, tex_coord_int);
fragColor = vec4(0.5) + 0.5*sin(0.1 * texture(tex, tex_coord_int));
fragColor = mix(0.7 * vec4(0.3, 0.1, 0.01, 1.0), vec4(0.0, 0.0, 0.4, 1.0), mx);
}

9
resources/Fractal.vsh
View File

@ -1,11 +1,10 @@
#version 330
in vec4 position;
in vec2 tex_coord;
out vec2 tex_coord_int;
out float mx;
void main(){
tex_coord_int = tex_coord;
gl_Position = position;
gl_Position = vec4(1);
gl_Position.xy = 0.04*position.xy;
mx = cos(0.1*position.z);
}

74
resources/Kernel.cl
View File

@ -1,80 +1,14 @@
kernel void initialize(size_t width, size_t height, write_only image2d_t output){
size_t x = get_global_id(0);
size_t y = get_global_id(1);
kernel void update(float s, float r, float b, float dt, __global float4* buffer){
size_t i = get_global_id(0);
int2 coord = {x, y};
const float xx = x / float(width - 1) - 0.5;
const float yy = y / float(height - 1) - 0.5;
float4 color = {0.066 * xx, 0.1 * yy, 0.1 * yy * xx, 1};
write_imagef(output, coord, color);
}
kernel void hblur(size_t width, size_t height, read_only image2d_t input, write_only image2d_t output){
int x = get_global_id(0);
int y = get_global_id(1);
const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE
| CLK_ADDRESS_NONE
| CLK_FILTER_NEAREST;
float4 c = {0, 0, 0, 0};
const int size = 7;
float weights[] = {0.25, 0.1, 0.1, 0.1, 0.1, 0.1, 0.25};
for(int i = 0; i < size; ++i){
int x2 = (x - size/2 + i + width) % width;
int2 read = {x2, y};
c += read_imagef(input, sampler, read) * weights[i];
}
int2 coord = {x, y};
write_imagef(output, coord, c);
}
kernel void vblur(size_t width, size_t height, read_only image2d_t input, write_only image2d_t output){
int x = get_global_id(0);
int y = get_global_id(1);
const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE
| CLK_ADDRESS_NONE
| CLK_FILTER_NEAREST;
float4 c = {0, 0, 0, 0};
int size = 7;
float weights[] = {0.25, 0.1, 0.1, 0.1, 0.1, 0.1, 0.25};
for(int i = 0; i < size; ++i){
int y2 = (y - size/2 + i + height) % height;
int2 read = {x, y2};
c += read_imagef(input, sampler, read) * weights[i];
}
int2 coord = {x, y};
write_imagef(output, coord, c);
}
kernel void update(size_t width, size_t height, read_only image2d_t input, write_only image2d_t output){
size_t x = get_global_id(0);
size_t y = get_global_id(1);
int2 coord = {x, y};
const sampler_t samplerA = CLK_NORMALIZED_COORDS_FALSE
| CLK_ADDRESS_NONE
| CLK_FILTER_NEAREST;
const float4 w = read_imagef(input, samplerA, coord);
const float4 w = buffer[i];
float4 v = w;
const float s = 9.120836;
const float r = 32.799129;
const float b = 2.902814;
const float dt = 0.019997;
v.x += dt * s * (w.y - w.x);
v.y += dt * (w.x * (r - w.z) - w.y);
v.z += dt * (w.x * w.y - b * w.z);
write_imagef(output, coord, v);
buffer[i] = v;
}

12
src/main.cpp
View File

@ -9,6 +9,7 @@ using namespace std;
int main() {
NSAppWrapper app;
unique_ptr<App> a;
app.create_window({
[&](ContextParameters ctxp){
a = make_unique<App>(ctxp.context);
@ -21,6 +22,17 @@ int main() {
}
});
// const float s = 10.962073;
// const float r = 31.211250;
// const float b = 1.537946;
app.create_window({{
{"s", 10.962073, 9, 13, [&](double x){ a->p_s = x; }},
{"r", 31.211250, 30, 32, [&](double x){ a->p_r = x; }},
{"b", 1.537946, 0.0001, 3, [&](double x){ a->p_b = x; }},
{"dt", 0.013040, 0.0001, 0.03, [&](double x){ a->p_dt = x; }}
}});
app.run();
}