new bloom render tasks, setup util and hdr bloom code example

framework/opengl_renderer/src/mm/opengl/bloom.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <string>
+
+#include "./render_task.hpp"
+
+namespace MM::OpenGL {
+
+	// helper function to setup a bloom blur and recombine chain
+	// creates (texture) rendertarget, fbos and rendertasks
+	// outputs blur to "blur_tmp1" texture
+	//
+	// you still need to add the Composition rendertask (or eqv) your self, eg:
+	//	auto& comp = rs.addRenderTask<MM::OpenGL::RenderTasks::Composition>(engine);
+	//	comp.color_tex = "hdr_color";
+	//	comp.bloom_tex = "blur_tmp1";
+	//	comp.target_fbo = "display";
+	void setup_bloom(
+		MM::Engine& engine,
+		const std::string color_src_tex = "hdr_color", // texture to extract color from
+		const size_t bloom_phases = 5, // number of downsampled blurs (4 prob fine for 720, 5 for 1080)
+		const float bloom_in_scale = 0.5f, // scale of bloom extraction layer (1 - 0.5 best, lower for more perf)
+		const float bloom_phase_scale = 0.5f // ammount of scaling per downsampling
+	);
+
+} // MM::OpenGL
+