nice shader effects (blurlike shit), codebase for video 5

App.h

@@ -21,15 +21,31 @@ static const std::string filenames[] = {
 	"resources/attractor_2011-04-29_04-34-41-9.stf",
 	"resources/attractor_2011-04-29_15-19-03-9.stf" };
 
+static const GLfloat quad[] = {
+	1.0, 1.0,
+	1.0, -1.0,
+	-1.0, -1.0,
+	-1.0, 1.0 };
+
+static const GLfloat tex_quad[] = {
+	1.0, 1.0,
+	1.0, 0.0,
+	0.0, 0.0,
+	0.0, 1.0 };
+
 class App {
 	int counter;
 	unsigned int width, height;
 
 	shader mshader;
 	shader clear_shader;
-	fbo mfbo;
+	shader texture_shader;
+	shader blur_shader1;
+	shader blur_shader2;
+	fbo fbo1;
+	fbo fbo2;
 
-	static constexpr size_t number_of_lines = 6*50000;
+	static constexpr size_t number_of_lines = 40000;
 	static constexpr size_t number_of_vertices = 2*number_of_lines;
 	std::array<GLfloat, 3*number_of_vertices> lines;
 	std::array<GLfloat, 7> parameters;
@@ -42,12 +58,19 @@ public:
 		height(h),
 		mshader("resources/myTeaShader.vert", "resources/myTeaShader.frag"),
 		clear_shader("resources/myClearShader.vert", "resources/myClearShader.frag"),
-		mfbo(width, height) {
+		texture_shader("resources/myTextureShader.vert", "resources/myTextureShader.frag"),
+		blur_shader1("resources/myHBlurShader.vert", "resources/myHBlurShader.frag"),
+		blur_shader2("resources/myVBlurShader.vert", "resources/myVBlurShader.frag"),
+		fbo1(width, height),
+		fbo2(width, height),
+		lines(),
+		parameters(),
+		random_parameters() {
 
 		set_points();
 		//glEnable(GL_DEPTH_TEST);
 		glEnable(GL_BLEND);
-		glPointSize(1.0);
+		glEnable(GL_TEXTURE_2D);
 
 		std::string filename = filenames[3];
 		set_parameters(filename);
@@ -57,63 +80,79 @@ public:
 	}
 
 	void resize(int w, int h) {
+		std::cout << w << "x" << h << std::endl;
 	}
 
 	void update() {
 		++counter;
 		iterate();
 
-		if(counter % 500 == 0) {
+		if(counter % 5000 == 0) {
 			set_parameters(filenames[rand() % 4]);
 			set_points();
 		}
 	}
 
 	void draw() {
-		clear_shader.begin();
-		clear_shader.set_uniform("fade", .5f);
-		if( counter < 5 )
-			clear_shader.set_uniform("fade", 1.0f);
-		fade();
-
+		fbo & read_fbo = (counter % 2) ? fbo1 : fbo2;
+		fbo & draw_fbo = (counter % 2) ? fbo2 : fbo1;
+		shader & blur_shader = (counter % 2) ? blur_shader1 : blur_shader2;
+
+		glClearColor(0.0, 0.0, 0.0, 0.0);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+		draw_fbo.begin();
+		glClearColor(0.0, 0.0, 0.0, 0.0);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		blur_shader.begin();
+			texture(read_fbo);
 		mshader.begin();
-		mshader.set_uniform("steps", counter);
+			scene();
+		draw_fbo.end();
 
-		glRotatef(0.5, std::sin(counter/1337.0), 1.0, 0.0);
+		texture_shader.begin();
+			texture(draw_fbo);
 
-		scene();
+		//save_screen();
 	}
 
 	void fade() {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-		static const GLfloat quad[] = {
-			1.0, 1.0,
-			1.0, -1.0,
-			-1.0, -1.0,
-			-1.0, 1.0 };
 
 		glEnableClientState(GL_VERTEX_ARRAY);
 		glVertexPointer(2, GL_FLOAT, 0, &quad[0]);
-
-		// draw a cube
 		glDrawArrays(GL_QUADS, 0, 4);
+		glDisableClientState(GL_VERTEX_ARRAY);
+	}
 
-		// deactivate vertex arrays after drawing
+	void texture(fbo const & read_fbo) {
+		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+		texture_shader.set_texture("tex", GL_TEXTURE_2D, read_fbo.texture_id, 0);
+
+		glEnableClientState(GL_VERTEX_ARRAY);
+		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+		glVertexPointer(2, GL_FLOAT, 0, &quad[0]);
+		glTexCoordPointer(2, GL_FLOAT, 0, &tex_quad[0]);
+		glDrawArrays(GL_QUADS, 0, 4);
+		glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 		glDisableClientState(GL_VERTEX_ARRAY);
 	}
 
 	void scene() {
 		glBlendFunc(GL_ONE, GL_ONE);
-		glEnableClientState(GL_VERTEX_ARRAY);
-		glVertexPointer(3, GL_FLOAT, 0, &lines[0]);
 
-		// draw a cube
-		glDrawArrays(GL_POINTS, 0, number_of_vertices);
+		mshader.set_uniform("steps", counter/10);
+		glRotatef(0.05, std::sin(counter/13370.0), 1.0, 0.0);
 
-		// deactivate vertex arrays after drawing
-		glDisableClientState(GL_VERTEX_ARRAY);
+		const unsigned int part = 8;
 
-		//save_screen();
+		glEnableClientState(GL_VERTEX_ARRAY);
+		glVertexPointer(3, GL_FLOAT, 0, &lines[0]);
+		glPointSize(3.0);
+		glDrawArrays(GL_POINTS, 0, number_of_vertices/part);
+		glPointSize(1.0);
+		glDrawArrays(GL_POINTS, number_of_vertices/part, (part-1)*number_of_vertices/part);
+		glDisableClientState(GL_VERTEX_ARRAY);
 	}
 
 	void iterate() {
@@ -159,7 +198,7 @@ public:
 		for(unsigned int i = 0; i < 7; ++i) {
 			stfu::node const attractorParameters = file.getChild("AttractorKernel").getChild("parameters");
 			parameters[i] = atof(attractorParameters.getValue(i).c_str());
-			random_parameters[i] = (rand() / (double)RAND_MAX - 0.5) * counter / 500000.0;
+			random_parameters[i] = (rand() / (double)RAND_MAX - 0.5) * counter / 5000000.0;
 		}
 	}
 

GlutTest.cbp

@@ -40,13 +40,20 @@
 		</Linker>
 		<Unit filename="App.h" />
 		<Unit filename="fbo.h" />
+		<Unit filename="globals.h" />
 		<Unit filename="main.cpp" />
 		<Unit filename="pngwriter/pngwriter.cc" />
 		<Unit filename="pngwriter/pngwriter.h" />
 		<Unit filename="resources/myClearShader.frag" />
 		<Unit filename="resources/myClearShader.vert" />
+		<Unit filename="resources/myHBlurShader.frag" />
+		<Unit filename="resources/myHBlurShader.vert" />
 		<Unit filename="resources/myTeaShader.frag" />
 		<Unit filename="resources/myTeaShader.vert" />
+		<Unit filename="resources/myTextureShader.frag" />
+		<Unit filename="resources/myTextureShader.vert" />
+		<Unit filename="resources/myVBlurShader.frag" />
+		<Unit filename="resources/myVBlurShader.vert" />
 		<Unit filename="shader.h" />
 		<Unit filename="stfu/stf.cpp" />
 		<Unit filename="stfu/stf.hpp" />

fbo.h

@@ -6,18 +6,17 @@
 #include <GL/glew.h>
 #include <GL/freeglut.h>
 
-
 class fbo {
+public:
 	int width, height;
 	GLuint fbo_number;
 	std::map<GLenum, GLuint> renderbuffers;
 	GLuint texture_id;
 
 public:
-	fbo(int width, int height) : width(width), height(height) {
-		check_status();
-		glGenBuffers(1, &fbo_number);
-		begin();
+	fbo(int width, int height) : width(width), height(height), fbo_number(0), renderbuffers(), texture_id(0) {
+		glGenFramebuffers(1, &fbo_number);
+		bind();
 
 		// generate texture
 		glGenTextures(1, &texture_id);
@@ -30,9 +29,14 @@ public:
 		create_attach_renderbuffer(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT);
 
 		// attach stencil
-		create_attach_renderbuffer(GL_STENCIL_INDEX, GL_STENCIL_ATTACHMENT);
+		//create_attach_renderbuffer(GL_STENCIL_INDEX, GL_STENCIL_ATTACHMENT);
 
 		check_status();
+
+		glClearColor(0.0, 0.0, 0.0, 0.0);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+		unbind();
 	}
 	~fbo() {
 		end();
@@ -47,14 +51,33 @@ public:
 	}
 
 	void begin(){
-		glBindFramebuffer(GL_FRAMEBUFFER, fbo_number);
+		bind();
+		//glPushAttrib(GL_VIEWPORT);
+		//glViewport(0, 0, width, height);
+
+		/*GLint savedFramebuffer = -1;
+		glGetIntegerv(GL_FRAMEBUFFER_BINDING, &savedFramebuffer);
+		std::cout << "sfb: " << savedFramebuffer << ", fbo: " << fbo_number << std::endl;*/
 	}
 
 	void end(){
-		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+		unbind();
+		//glPopAttrib();
 	}
 
 private:
+	void bind(){
+		glBindFramebuffer(GL_FRAMEBUFFER, fbo_number);
+
+		GLenum status = glGetError();
+		if(status != GL_NO_ERROR)
+			throw std::runtime_error("i has error" + std::to_string(status) + "with fbo: " + std::to_string(fbo_number));
+	}
+
+	void unbind(){
+		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	}
+
 	void create_attach_renderbuffer(GLenum format, GLenum attachment_point) {
 		GLuint buffer;
 		glGenRenderbuffers(1, &buffer);
@@ -66,9 +89,7 @@ private:
 	}
 
 	void check_status() {
-		GLenum status = glGetError();
-		if(status != GL_NO_ERROR) {
-			status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 		switch(status) {
 		case GL_FRAMEBUFFER_COMPLETE:
 			std::cout << "FRAMEBUFFER_COMPLETE - OK" << std::endl;
@@ -101,7 +122,13 @@ private:
 			std::cout << "UNKNOWN FRAMEBUFFER ERROR" << std::endl;
 			break;
 		}
-			throw std::runtime_error("I will not continu..");
+		//throw std::runtime_error("I will not continu..");
+	}
+
+	void check_error(){
+		GLenum status = glGetError();
+		if(status != GL_NO_ERROR){
+			throw std::runtime_error("GL Error: " + std::to_string(status));
 		}
 	}
 

globals.h

@@ -0,0 +1,7 @@
+#ifndef globals_h
+#define globals_h
+
+#define kWindowWidth	800
+#define kWindowHeight	600
+
+#endif // globals_h

main.cpp

@@ -7,13 +7,11 @@
 #include <GL/freeglut.h>
 
 #include "App.h"
-
-#define kWindowWidth	1280
-#define kWindowHeight	700
+#include "globals.h"
 
 
 App* app_ptr = 0;
-unsigned int const frames_per_second = 100.0;
+unsigned int const frames_per_second = 60.0;
 
 
 typedef std::chrono::high_resolution_clock clock_type;
@@ -64,6 +62,7 @@ int main(int argc, char** argv) {
 			//glFlush();
 
 			++frame_count;
+			if(frame_count == 7400) exit(0);
 
 			previous_timepoint = current_timepoint-(difference%time_step);
 		} else {

pngwriter/pngwriter.h

@@ -88,7 +88,7 @@ using namespace std;
 
 
 #define PNG_BYTES_TO_CHECK (4)
-#define PNGWRITER_DEFAULT_COMPRESSION (6)
+#define PNGWRITER_DEFAULT_COMPRESSION (0)
 
 class pngwriter {
 private:

resources/myHBlurShader.frag

@@ -0,0 +1,12 @@
+uniform sampler2D tex;
+
+vec2 offset = vec2(0.0, 1.0/600.0);
+
+void main( void ) {
+	gl_FragColor = texture2D(tex, gl_TexCoord[0].st + offset);
+	gl_FragColor += texture2D(tex, gl_TexCoord[0].st - offset);
+	gl_FragColor = normalize(gl_FragColor) + 0.5*gl_FragColor;
+	gl_FragColor *= 0.56;
+	//gl_FragColor = sin(gl_FragColor*3.0);
+	gl_FragColor.a = 1.0;
+}

resources/myHBlurShader.vert

@@ -0,0 +1,5 @@
+
+void main( void ) {
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	gl_Position = gl_Vertex;
+}

resources/myTeaShader.frag

@@ -4,6 +4,6 @@ uniform int steps;
 
 void main( void ) {
 	gl_FragColor.rgb = sin(3.0*sin(normalize(color.rgb) + vec3(steps)*vec3(0.01, 0.017, 0.0093)))*0.5+0.5;
-	gl_FragColor.rgb *= 0.1;
+	gl_FragColor.rgb *= 0.05;
 	gl_FragColor.a = 1.0;
 }

resources/myTeaShader.vert

@@ -2,6 +2,7 @@ varying vec4 color;
 
 void main( void ) {
 	gl_Position = ftransform();
-	gl_Position.xyz = gl_Position.xyz*0.6 - vec3(0.0, 0.0, 0.0);
+	gl_Position.xyz = gl_Position.xyz*0.6;
+	gl_Position.x *= 600.0/800.0;
 	color = gl_Vertex;
 }

resources/myTextureShader.frag

@@ -0,0 +1,8 @@
+
+uniform sampler2D tex;
+
+void main( void ) {
+	gl_FragColor = texture2D(tex, gl_TexCoord[0].st);
+	//gl_FragColor = sin(gl_FragColor*3.0);
+	gl_FragColor.a = 1.0;
+}

resources/myTextureShader.vert

@@ -0,0 +1,5 @@
+
+void main( void ) {
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	gl_Position = gl_Vertex;
+}

resources/myVBlurShader.frag

@@ -0,0 +1,12 @@
+uniform sampler2D tex;
+
+vec2 offset = vec2(1.0/800.0, 0.0);
+
+void main( void ) {
+	gl_FragColor = texture2D(tex, gl_TexCoord[0].st + offset);
+	gl_FragColor += texture2D(tex, gl_TexCoord[0].st - offset);
+	gl_FragColor = normalize(gl_FragColor) + 0.5*gl_FragColor;
+	gl_FragColor *= 0.56;
+	//gl_FragColor = sin(gl_FragColor*3.0);
+	gl_FragColor.a = 1.0;
+}

resources/myVBlurShader.vert

@@ -0,0 +1,5 @@
+
+void main( void ) {
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	gl_Position = gl_Vertex;
+}

shader.h

@@ -16,7 +16,8 @@ class shader {
 
 public:
 
-	shader(std::string vertex_shader_filename, std::string fragment_shader_filename) {
+	shader(std::string vertex_shader_filename, std::string fragment_shader_filename) :
+	program(0), shaders() {
 		program = glCreateProgram();
 		if(program == 0) {
 			throw std::runtime_error("Program couldn't be created");
@@ -91,6 +92,12 @@ public:
 		glUniform4i(glGetUniformLocation(program, name), x, y, z, w);
 	}
 
+	void set_texture(const char* name, GLenum target, GLuint tex, int textureLocation) {
+		glActiveTexture(GL_TEXTURE0 + textureLocation);
+		glBindTexture(target, tex);
+		set_uniform(name, textureLocation);
+	}
+
 private:
 
 	void read_shader(std::istream& file, GLenum type) {