Uses floating point texture. Calculates lorenz stuff

resources/Fractal.fsh

@@ -7,5 +7,6 @@ in vec2 tex_coord_int;
 out vec4 fragColor;
 
 void main(){
-	fragColor = texture(tex, tex_coord_int);
+	// fragColor = texture(tex, tex_coord_int);
+	fragColor = vec4(0.5) + 0.5*sin(0.1 * texture(tex, tex_coord_int));
 }

resources/Kernel.cl

@@ -4,11 +4,11 @@ kernel void initialize(size_t width, size_t height, write_only image2d_t output)
 	size_t y = get_global_id(1);
 
 	int2 coord = {x, y};
-	//uint4 color = {255 * x / (width - 1), 255 * y / (height - 1), 0, 255};
+	const float xx = x / float(width - 1) - 0.5;
-	//uint4 color = {255 * (x%2), 120 * (y%2), 0, 255};
+	const float yy = y / float(height - 1) - 0.5;
-	uint4 color = {255, 255, 0, 255};
+	float4 color = {0.066 * xx, 0.1 * yy, 0.1 * yy * xx, 1};
 
-	write_imageui(output, coord, color);
+	write_imagef(output, coord, color);
 }
 
 kernel void update(size_t width, size_t height, read_only image2d_t input, write_only image2d_t output){
@@ -20,8 +20,19 @@ kernel void update(size_t width, size_t height, read_only image2d_t input, write
 	const sampler_t samplerA = CLK_NORMALIZED_COORDS_FALSE
 				 | CLK_ADDRESS_NONE
 				 | CLK_FILTER_NEAREST;
-	uint4 color = read_imageui(input, samplerA, coord).yzxw;
+
-	color.x = 255 - color.x;
+	const float4 w = read_imagef(input, samplerA, coord);
-	write_imageui(output, coord, color);
+	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);
 }
 

src/main.cpp

@@ -58,6 +58,8 @@ struct App {
 	size_t W = 128;
 	size_t H = 128;
 
+	float wait = 2;
+
 	enum {
 		POS_ATTR,
 		TEX_ATTR
@@ -93,7 +95,7 @@ struct App {
 		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, nullptr);
+		moggle::gl::texture_image_2d(GL_TEXTURE_2D, 0, GL_RGBA32F, W, H, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
 		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;
@@ -157,9 +159,16 @@ struct App {
 	}
 
 	void draw(){
-		time += 1/60.0f;
+		auto dt = 1/60.0;
+		time += dt;
+		if(wait > 0) wait -= dt;
+
+		if(wait <= 0){
+			for(int i = 0; i < 1; ++i){
+				cl::checky((*k_update)(*cl_queue, W, H, W, H, *cl_image, *cl_image));
+			}
+		}
 
-		cl::checky((*k_update)(*cl_queue, W, H, W, H, *cl_image, *cl_image));
 		cl::checky(cl_queue->finish());
 
 		moggle::gl::clear_color(0.65f, 0.65f, 0.65f, 1.0f);
@@ -176,6 +185,8 @@ struct App {
 	}
 
 	void resize(size_t w, size_t h){
+		wait = 2;
+
 		W = w;
 		H = h;