Chiebot-Mirror
/
opencv_contrib
8
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

ported shader-demo to new api

Browse Source
pull/3471/head
kallaballa 2 years ago
parent b40a44e432
commit db5af7ae67
1 changed files with 238 additions and 235 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 321
      modules/v4d/samples/shader-demo.cpp

321
modules/v4d/samples/shader-demo.cpp
Unescape View File

@ -22,39 +22,6 @@ const unsigned long DIAG = hypot(double(WIDTH), double(HEIGHT));
constexpr const char* OUTPUT_FILENAME = "shader-demo.mkv"; constexpr const char* OUTPUT_FILENAME = "shader-demo.mkv";
#endif #endif
/* Mandelbrot control parameters */
static int glow_kernel_size = std::max(int(DIAG / 200 % 2 == 0 ? DIAG / 200 + 1 : DIAG / 200), 1);
// Red, green, blue and alpha. All from 0.0f to 1.0f
static float base_color_val[4] = {0.2, 0.6, 1.0, 1.0};
//contrast boost
static int contrast_boost = 50; //0.0-255
//max fractal iterations
static int max_iterations = 1000;
//center x coordinate
static float center_x = -0.119609;
//center y coordinate
static float center_y = 0.13262;
static float zoom_factor = 1.0;
static float current_zoom = 1.0;
static float zoom_incr = 0.99;
static bool manual_navigation = false;
/* GL uniform handles */
static thread_local GLint base_color_hdl;
static thread_local GLint contrast_boost_hdl;
static thread_local GLint max_iterations_hdl;
static thread_local GLint center_x_hdl;
static thread_local GLint center_y_hdl;
static thread_local GLint current_zoom_hdl;
static thread_local GLint resolution_hdl;
/* Shader program handle */
static thread_local GLuint shader_program_hdl;
/* Object handles */
static thread_local GLuint VAO;
static thread_local GLuint VBO, EBO;
// vertex position, color // vertex position, color
static const float vertices[] = { static const float vertices[] = {
// x y z // x y z
@ -66,34 +33,102 @@ static const unsigned int indices[] = {
// 0'---3 // 0'---3
0, 1, 2, 0, 3, 1 }; 0, 1, 2, 0, 3, 1 };
//Load objects and buffers //easing function for the bungee zoom
static void load_buffer_data() { static float easeInOutQuint(float x) {
glGenVertexArrays(1, &VAO); return x < 0.5f ? 16.0f * x * x * x * x * x : 1.0f - std::pow(-2.0f * x + 2.0f, 5.0f) / 2.0f;
glBindVertexArray(VAO); }
glGenBuffers(1, &VBO); #ifndef __EMSCRIPTEN__
glGenBuffers(1, &EBO); static void glow_effect(const cv::UMat& src, cv::UMat& dst, const int ksize) {
static thread_local cv::UMat resize;
static thread_local cv::UMat blur;
static thread_local cv::UMat dst16;
glBindBuffer(GL_ARRAY_BUFFER, VBO); cv::bitwise_not(src, dst);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO); cv::resize(dst, resize, cv::Size(), 0.5, 0.5);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW); cv::boxFilter(resize, resize, -1, cv::Size(ksize, ksize), cv::Point(-1, -1), true,
cv::BORDER_REPLICATE);
cv::resize(resize, blur, src.size());
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*) 0); cv::multiply(dst, blur, dst16, 1, CV_16U);
glEnableVertexAttribArray(0); cv::divide(dst16, cv::Scalar::all(255.0), dst, 1, CV_8U);
glBindBuffer(GL_ARRAY_BUFFER, 0); cv::bitwise_not(dst, dst);
glBindVertexArray(0);
} }
#endif
//mandelbrot shader code adapted from my own project: https://github.com/kallaballa/FractalDive#after using namespace cv::v4d;
static void load_shader() {
#if !defined(__EMSCRIPTEN__) && !defined(OPENCV_V4D_USE_ES3) class ShaderDemoPlan : public Plan {
struct Params {
/* Mandelbrot control parameters */
int glowKernelSize_ = std::max(int(DIAG / 200 % 2 == 0 ? DIAG / 200 + 1 : DIAG / 200), 1);
// Red, green, blue and alpha. All from 0.0f to 1.0f
float baseColorVal_[4] = {0.2, 0.6, 1.0, 1.0};
//contrast boost
int contrastBoost_ = 50; //0.0-255
//max fractal iterations
int maxIterations_ = 1000;
//center x coordinate
float centerX_ = -0.119609;
//center y coordinate
float centerY_ = 0.13262;
float zoomFactor_ = 1.0;
float currentZoom_ = 1.0;
float zoomIncr_ = 0.99;
bool manualNavigation_ = false;
} params_;
struct Handles {
/* GL uniform handles */
GLint baseColorHdl_;
GLint contrastBoostHdl_;
GLint maxIterationsHdl_;
GLint centerXHdl_;
GLint centerYHdl_;
GLint currentZoomHdl_;
GLint resolutionHdl_;
/* Shader program handle */
GLuint shaderHdl_;
/* Object handles */
GLuint vao_;
GLuint vbo_, ebo_;
} handles_;
cv::Size sz_;
public:
//Load objects and buffers
static void load_buffers(Handles& handles) {
GL_CHECK(glGenVertexArrays(1, &handles.vao_));
GL_CHECK(glBindVertexArray(handles.vao_));
GL_CHECK(glGenBuffers(1, &handles.vbo_));
GL_CHECK(glGenBuffers(1, &handles.ebo_));
GL_CHECK(glBindBuffer(GL_ARRAY_BUFFER, handles.vbo_));
GL_CHECK(glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW));
GL_CHECK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handles.ebo_));
GL_CHECK(glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW));
GL_CHECK(glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*) 0));
GL_CHECK(glEnableVertexAttribArray(0));
GL_CHECK(glBindBuffer(GL_ARRAY_BUFFER, 0));
GL_CHECK(glBindVertexArray(0));
}
//mandelbrot shader code adapted from my own project: https://github.com/kallaballa/FractalDive#after
static GLuint load_shader() {
#if !defined(__EMSCRIPTEN__) && !defined(OPENCV_V4D_USE_ES3)
const string shaderVersion = "330"; const string shaderVersion = "330";
#else #else
const string shaderVersion = "300 es"; const string shaderVersion = "300 es";
#endif #endif
const string vert = const string vert =
" #version " + shaderVersion " #version " + shaderVersion
@ -116,8 +151,8 @@ static void load_shader() {
uniform int contrast_boost; uniform int contrast_boost;
uniform int max_iterations; uniform int max_iterations;
uniform float current_zoom; uniform float current_zoom;
uniform float center_x;
uniform float center_y; uniform float center_y;
uniform float center_x;
uniform vec2 resolution; uniform vec2 resolution;
int get_iterations() int get_iterations()
@ -164,149 +199,117 @@ static void load_shader() {
determine_color(); determine_color();
})"; })";
shader_program_hdl = cv::v4d::initShader(vert.c_str(), frag.c_str(), "fragColor"); return cv::v4d::initShader(vert.c_str(), frag.c_str(), "fragColor");
} }
//easing function for the bungee zoom
static float easeInOutQuint(float x) {
return x < 0.5f ? 16.0f * x * x * x * x * x : 1.0f - std::pow(-2.0f * x + 2.0f, 5.0f) / 2.0f;
}
//Initialize shaders, objects, buffers and uniforms //Initialize shaders, objects, buffers and uniforms
static void init_scene(const cv::Size& sz) { static void initScene(const cv::Size& sz, Handles& handles) {
glEnable(GL_BLEND); GL_CHECK(glEnable(GL_BLEND));
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); GL_CHECK(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
load_shader(); handles.shaderHdl_ = load_shader();
load_buffer_data(); load_buffers(handles);
base_color_hdl = glGetUniformLocation(shader_program_hdl, "base_color"); handles.baseColorHdl_ = glGetUniformLocation(handles.shaderHdl_, "base_color");
contrast_boost_hdl = glGetUniformLocation(shader_program_hdl, "contrast_boost"); handles.contrastBoostHdl_ = glGetUniformLocation(handles.shaderHdl_, "contrast_boost");
max_iterations_hdl = glGetUniformLocation(shader_program_hdl, "max_iterations"); handles.maxIterationsHdl_ = glGetUniformLocation(handles.shaderHdl_, "max_iterations");
current_zoom_hdl = glGetUniformLocation(shader_program_hdl, "current_zoom"); handles.currentZoomHdl_ = glGetUniformLocation(handles.shaderHdl_, "current_zoom");
center_x_hdl = glGetUniformLocation(shader_program_hdl, "center_x"); handles.centerXHdl_ = glGetUniformLocation(handles.shaderHdl_, "center_x");
center_y_hdl = glGetUniformLocation(shader_program_hdl, "center_y"); handles.centerYHdl_ = glGetUniformLocation(handles.shaderHdl_, "center_y");
resolution_hdl = glGetUniformLocation(shader_program_hdl, "resolution"); handles.resolutionHdl_ = glGetUniformLocation(handles.shaderHdl_, "resolution");
glViewport(0, 0, sz.width, sz.height); GL_CHECK(glViewport(0, 0, sz.width, sz.height));
} }
//Render the mandelbrot fractal on top of a video //Render the mandelbrot fractal on top of a video
static void render_scene(const cv::Size& sz) { static void renderScene(const cv::Size& sz, Params& params, Handles& handles) {
//bungee zoom //bungee zoom
if (current_zoom >= 1) { if (params.currentZoom_ >= 1) {
zoom_incr = -0.01; params.zoomIncr_ = -0.01;
} else if (current_zoom < 2.5e-06) { } else if (params.currentZoom_ < 2.5e-06) {
zoom_incr = +0.01; params.zoomIncr_ = +0.01;
} }
glUseProgram(shader_program_hdl); GL_CHECK(glUseProgram(handles.shaderHdl_));
glUniform4f(base_color_hdl, base_color_val[0], base_color_val[1], base_color_val[2], base_color_val[3]); GL_CHECK(glUniform4f(handles.baseColorHdl_, params.baseColorVal_[0], params.baseColorVal_[1], params.baseColorVal_[2], params.baseColorVal_[3]));
glUniform1i(contrast_boost_hdl, contrast_boost); GL_CHECK(glUniform1i(handles.contrastBoostHdl_, params.contrastBoost_));
glUniform1i(max_iterations_hdl, max_iterations); GL_CHECK(glUniform1i(handles.maxIterationsHdl_, params.maxIterations_));
glUniform1f(center_y_hdl, center_y); GL_CHECK(glUniform1f(handles.centerYHdl_, params.centerY_));
glUniform1f(center_x_hdl, center_x); GL_CHECK(glUniform1f(handles.centerXHdl_, params.centerX_));
if (!manual_navigation) { if (!params.manualNavigation_) {
current_zoom += zoom_incr; params.currentZoom_ += params.zoomIncr_;
glUniform1f(current_zoom_hdl, easeInOutQuint(current_zoom)); GL_CHECK(glUniform1f(handles.currentZoomHdl_, easeInOutQuint(params.currentZoom_)));
} else { } else {
current_zoom = 1.0 / pow(zoom_factor, 5.0f); params.currentZoom_ = 1.0 / pow(params.zoomFactor_, 5.0f);
glUniform1f(current_zoom_hdl, current_zoom); GL_CHECK(glUniform1f(handles.currentZoomHdl_, params.currentZoom_));
} }
float res[2] = {float(sz.width), float(sz.height)}; float res[2] = {float(sz.width), float(sz.height)};
glUniform2fv(resolution_hdl, 1, res); GL_CHECK(glUniform2fv(handles.resolutionHdl_, 1, res));
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
}
#ifndef __EMSCRIPTEN__
static void glow_effect(const cv::UMat& src, cv::UMat& dst, const int ksize) {
static thread_local cv::UMat resize;
static thread_local cv::UMat blur;
static thread_local cv::UMat dst16;
cv::bitwise_not(src, dst);
cv::resize(dst, resize, cv::Size(), 0.5, 0.5);
cv::boxFilter(resize, resize, -1, cv::Size(ksize, ksize), cv::Point(-1, -1), true,
cv::BORDER_REPLICATE);
cv::resize(resize, blur, src.size());
cv::multiply(dst, blur, dst16, 1, CV_16U);
cv::divide(dst16, cv::Scalar::all(255.0), dst, 1, CV_8U);
cv::bitwise_not(dst, dst);
}
#endif
using namespace cv::v4d; GL_CHECK(glBindVertexArray(handles.vao_));
GL_CHECK(glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0));
}
//Setup the GUI using ImGUI. void gui(cv::Ptr<V4D> window) override {
static void setup_gui(cv::Ptr<V4D> window) { window->imgui([this](cv::Ptr<V4D> window, ImGuiContext* ctx) {
window->imgui([](ImGuiContext* ctx) {
using namespace ImGui; using namespace ImGui;
SetCurrentContext(ctx); SetCurrentContext(ctx);
Begin("Fractal"); Begin("Fractal");
Text("Navigation"); Text("Navigation");
SliderInt("Iterations", &max_iterations, 3, 50000); SliderInt("Iterations", &params_.maxIterations_, 3, 50000);
if(SliderFloat("X", &center_x, -1.0f, 1.0f)) if(SliderFloat("X", &params_.centerX_, -1.0f, 1.0f))
manual_navigation = true; params_.manualNavigation_ = true;
if(SliderFloat("Y", &center_y, -1.0f, 1.0f)) if(SliderFloat("Y", &params_.centerY_, -1.0f, 1.0f))
manual_navigation = true; params_.manualNavigation_ = true;
if(SliderFloat("Zoom", &zoom_factor, 1.0f, 100.0f)) if(SliderFloat("Zoom", &params_.zoomFactor_, 1.0f, 100.0f))
manual_navigation = true; params_.manualNavigation_ = true;
#ifndef __EMSCRIPTEN__ #ifndef __EMSCRIPTEN__
Text("Glow"); Text("Glow");
SliderInt("Kernel Size", &glow_kernel_size, 1, 127); SliderInt("Kernel Size", &params_.glowKernelSize_, 1, 127);
#endif #endif
Text("Color"); Text("Color");
ColorPicker4("Color", base_color_val); ColorPicker4("Color", params_.baseColorVal_);
SliderInt("Contrast boost", &contrast_boost, 1, 255); SliderInt("Contrast boost", &params_.contrastBoost_, 1, 255);
End(); End();
}); });
} }
class ShaderDemoPlan : public Plan { void setup(cv::Ptr<V4D> window) override {
public: sz_ = window->fbSize();
void setup(cv::Ptr<V4D> window) override { window->gl([](const cv::Size &sz, Handles& handles) {
window->gl([](const cv::Size &sz) { initScene(sz, handles);
init_scene(sz); }, sz_, handles_);
}, window->fbSize()); }
}
void infer(cv::Ptr<V4D> window) override { void infer(cv::Ptr<V4D> window) override {
window->capture(); window->capture();
window->gl([](const cv::Size &sz) { window->gl([](const cv::Size &sz, Params& params, Handles& handles) {
render_scene(sz); renderScene(sz, params, handles);
}, window->fbSize()); }, sz_, params_, handles_);
#ifndef __EMSCRIPTEN__ #ifndef __EMSCRIPTEN__
window->fb([](cv::UMat& framebuffer) { window->fb([](cv::UMat& framebuffer, const Params& params) {
glow_effect(framebuffer, framebuffer, glow_kernel_size); glow_effect(framebuffer, framebuffer, params.glowKernelSize_);
}); }, params_);
#endif #endif
window->write(); window->write();
} }
}; };
#ifndef __EMSCRIPTEN__
int main(int argc, char** argv) { int main(int argc, char** argv) {
#ifndef __EMSCRIPTEN__
if (argc != 2) { if (argc != 2) {
cerr << "Usage: shader-demo <video-file>" << endl; cerr << "Usage: shader-demo <video-file>" << endl;
exit(1); exit(1);
} }
#else #else
int main() { CV_UNUSED(args);
CV_UNUSED(argv);
#endif #endif
try { try {
cv::Ptr<V4D> window = V4D::make(WIDTH, HEIGHT, "Mandelbrot Shader Demo", IMGUI, OFFSCREEN, false, 0); cv::Ptr<V4D> window = V4D::make(WIDTH, HEIGHT, "Mandelbrot Shader Demo", IMGUI, OFFSCREEN);
if (!OFFSCREEN) {
setup_gui(window);
}
#ifndef __EMSCRIPTEN__ #ifndef __EMSCRIPTEN__
auto src = makeCaptureSource(window, argv[1]); auto src = makeCaptureSource(window, argv[1]);

Write Preview
Loading…
Cancel
Save