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attractor-cl
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Uses opencl to generate a texture

master
Joshua Moerman 10 years ago
parent
9e6a51a844
commit
878e7d5cf2
4 changed files with 123 additions and 75 deletions
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  1. 21
      resources/Fractal.fsh
  2. 15
      resources/Fractal.vsh
  3. 18
      resources/Kernel.cl
  4. 144
      src/main.cpp

21
resources/Fractal.fsh
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@ -1,26 +1,11 @@
#version 330
uniform float rotation;
uniform sampler2D tex;
in vec2 pos;
in vec2 start;
in vec2 tex_coord_int;
out vec4 fragColor;
void main(){
vec2 z = start;
int i = 0;
for (i = 0; i < 30; i++) {
vec2 zsq = z*z;
if(zsq.x + zsq.y > 16.0) break;
float t = zsq.x - zsq.y + pos.x;
z.y = 2.0*z.x*z.y + pos.y;
z.x = t;
}
fragColor = vec4(float(i) / 30.0);
fragColor.bg = 0.5 * sin(z) + 0.5;
fragColor = texture(tex, tex_coord_int);
}

15
resources/Fractal.vsh
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@ -1,18 +1,11 @@
#version 330
uniform float rotation;
in vec4 position;
in vec4 color;
in vec2 tex_coord;
out vec2 pos;
out vec2 start;
out vec2 tex_coord_int;
void main(){
pos = position.xy;
pos.x -= 0.5;
start = sqrt(1.0 + 0.01 * rotation) * 0.3 * sin(vec2(0.1, 0.1337) * rotation);
gl_Position = position;
tex_coord_int = tex_coord;
gl_Position = position;
}

18
resources/Kernel.cl
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@ -1,8 +1,18 @@
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);
int2 coord = {x, y};
uint4 color = {255 * x / (width - 1), 255 * y / (height - 1), 0, 255};
write_imageui(output, coord, color);
}
kernel void square(global float* input, size_t width, global float* output){
size_t x = get_global_id(0);
size_t y = get_global_id(1);
float i = 2.0 * (input[x + width*y] - 0.5);
output[x + width*y] = 0.5 + 0.5*sin((1.0 - i) * sin(i*i + 6.2*float(x)/width) + cos(1.0/i + 6.2*float(y)/width));
size_t x = get_global_id(0);
size_t y = get_global_id(1);
float i = 2.0 * (input[x + width*y] - 0.5);
output[x + width*y] = 0.5 + 0.5*sin((1.0 - i) * sin(i*i + 6.2*float(x)/width) + cos(1.0/i + 6.2*float(y)/width));
}

144
src/main.cpp
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@ -1,6 +1,6 @@
#include <cl2.hpp>
#include <NSWrapper.hpp>
#include <NSGLWrapper.hpp>
#include <png.hpp>
#include <moggle/core/gl.hpp>
@ -8,62 +8,57 @@
#include <moggle/core/vao.hpp>
#include <moggle/core/vbo.hpp>
#include <OpenGL/gl3.h>
#include <OpenGL/OpenGL.h>
#include <OpenGL/CGLDevice.h>
#include <OpenCL/opencl.h>
#include <vector>
#include <iostream>
#include <fstream>
#include <sstream>
#include <cassert>
#include <cmath>
#include <memory>
using namespace std;
#define BUFFER_OFFSET(i) ((char *)NULL + (i))
std::string slurp(std::string file_name){
std::ifstream f(file_name);
if (!f) throw std::runtime_error(std::string("Unable to open file: ") + file_name);
return {std::istreambuf_iterator<char>(f), std::istreambuf_iterator<char>()};
}
struct Vertex{
moggle::vector3<GLfloat> position;
moggle::vector3<GLfloat> color;
moggle::vector2<GLfloat> tex_coord;
};
const Vertex quad[] = {
// x y z, r g b
{{1, -1, 0}, {1, 0, 0}},
{{-1, -1, 0}, {0, 1, 0}},
{{1, 1, 0}, {0, 0, 1}},
{{-1, 1, 0}, {1, 1, 1}}
// 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 void check_shader(GLuint s){
GLint logLength;
glGetShaderiv(s, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetShaderInfoLog(s, logLength, &logLength, log);
std::cout << "Shader compile log:\n%s" << log << std::endl;
free(log);
}
}
string slurp(string filename) {
ifstream in(filename);
stringstream sstr;
sstr << in.rdbuf();
return sstr.str();
}
struct App {
float time = 0;
moggle::shader_program program;
moggle::vao v;
moggle::vbo<Vertex> quad_vbo;
// ptrs to postpone construction, should clean this up
unique_ptr<cl::Context> cl_context;
unique_ptr<cl::ImageGL> cl_image;
float time = 0;
GLuint gl_texture = 0;
size_t W = 128;
size_t H = 128;
enum {
POS_ATTR,
COL_ATTR
TEX_ATTR
};
void initialize(){
void load_shader(){
auto vs = moggle::shader::from_file(moggle::shader_type::vertex, "Fractal.vsh");
auto fs = moggle::shader::from_file(moggle::shader_type::fragment, "Fractal.fsh");
@ -71,19 +66,81 @@ struct App {
program.attach(fs);
program.bind_attribute(POS_ATTR, "position");
program.bind_attribute(COL_ATTR, "color");
program.bind_attribute(TEX_ATTR, "tex_coord");
program.link();
}
void create_vao(){
v.bind();
quad_vbo.bind(GL_ARRAY_BUFFER);
quad_vbo.data(quad);
moggle::gl::enable_vertex_attribute_array(POS_ATTR);
moggle::gl::enable_vertex_attribute_array(COL_ATTR);
moggle::gl::enable_vertex_attribute_array(TEX_ATTR);
v.attribute(POS_ATTR, quad_vbo, &Vertex::position);
v.attribute(COL_ATTR, quad_vbo, &Vertex::color);
v.attribute(TEX_ATTR, quad_vbo, &Vertex::tex_coord);
}
GLuint create_texture(){
std::vector<GLubyte> data(4*W*H);
for(int i = 0; i < data.size(); i += 4){
data[i+0] = 255 * i / (W-1);
data[i+1] = 127;
data[i+2] = 0;
data[i+3] = 255;
}
GLuint tex = 0;
moggle::gl::active_texture(GL_TEXTURE0);
moggle::gl::generate_textures(1, &tex);
moggle::gl::bind_texture(GL_TEXTURE_2D, tex);
moggle::gl::texture_image_2d(GL_TEXTURE_2D, 0, GL_RGBA, W, H, 0, GL_RGBA, GL_UNSIGNED_BYTE, data.data());
moggle::gl::texture_parameter_i(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
moggle::gl::texture_parameter_i(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
return tex;
}
void initialize(GLContext & gl_context){
// Fractal part
load_shader();
create_vao();
// create a texture for opencl
gl_texture = create_texture();
// share the bitch
CGLShareGroupObj sharegroup = CGLGetShareGroup(gl_context.ctx);
cl_int err = 0;
cl_context_properties properties[] = { CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE, (cl_context_properties)sharegroup, 0 };
cl_context = make_unique<cl::Context>(CL_DEVICE_TYPE_CPU, properties, nullptr, nullptr, &err);
cl::checky(err);
auto cl_device = cl_context->getInfo<CL_CONTEXT_DEVICES>().front();
// obtain cl memory object
cl_image = make_unique<cl::ImageGL>(*cl_context, CL_MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, gl_texture, &err);
cl::checky(err);
std::cout << *cl_image << std::endl; // sanity check
// build the program
auto KernelSource = slurp("Kernel.cl");
cl::Program program(*cl_context, {KernelSource.c_str(), KernelSource.size()}, true, &err);
cout << program.getBuildInfo<CL_PROGRAM_BUILD_LOG>(cl_device) << std::endl;
cl::checky(err);
cout << program << endl;
// grab the kernel
KernelOp kernel(program, "initialize", &err);
cl::checky(err);
// create a queue (for the first device)
cl::CommandQueue queue(*cl_context, cl_device);
cl::checky(kernel(queue, W, H, W, H, *cl_image));
cl::checky(queue.flush());
}
void draw(){
@ -93,7 +150,10 @@ struct App {
moggle::gl::clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
program.use();
program.uniform<GLfloat>("rotation").set(time);
moggle::gl::bind_texture(GL_TEXTURE_2D, gl_texture);
program.uniform<GLint>("tex").set(0);
v.bind();
moggle::gl::draw_arrays(GL_TRIANGLE_STRIP, 0, 4);
@ -120,8 +180,8 @@ struct CLApp {
cl::CommandQueue queue(context, context.getInfo<CL_CONTEXT_DEVICES>().front());
// make a lot of data
constexpr size_t W = 1280 * 1;
constexpr size_t H = 800 * 1;
constexpr size_t W = 512;
constexpr size_t H = 512;
std::vector<cl_float> input_vector(W*H);
for(int y = 0; y < H; ++y){
@ -133,7 +193,7 @@ struct CLApp {
// transfer data into buffers
cl::Buffer input(context, input_vector.begin(), input_vector.end(), false, true);
int r = 20, g = 20, b = 20;
int r = 10, g = 10, b = 10;
// DO IT (in place)
for(int i = 0; i < r; ++i){
@ -183,9 +243,9 @@ int main() {
NSAppWrapper app;
app.create_window({
[&](ContextParameters){
a.initialize();
// b.initialize();
[&](ContextParameters ctxp){
//b.initialize();
a.initialize(ctxp.context);
},
[&](ContextParameters){
a.draw();