X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Feffects%2Fambientocclusion.cpp;h=8c31a53fb115ddfe5ff25dd1f540e60132f6dc5b;hp=a10fa838e7b3b1d0f2da41c1f4f3b029a97df92e;hb=c8520aa336e92f2eaf9a38c3430c608520a90324;hpb=e6bb00e2d6b817b81a555b6cbebe3ba4ec28cf80

diff --git a/source/effects/ambientocclusion.cpp b/source/effects/ambientocclusion.cpp
index a10fa838..8c31a53f 100644
--- a/source/effects/ambientocclusion.cpp
+++ b/source/effects/ambientocclusion.cpp
@@ -2,10 +2,10 @@
 #include "ambientocclusion.h"
 #include "blend.h"
 #include "camera.h"
+#include "mesh.h"
 #include "renderer.h"
 #include "resources.h"
-#include "shader.h"
-#include "tests.h"
+#include "texture2d.h"
 
 using namespace std;
 
@@ -13,19 +13,38 @@ namespace Msp {
 namespace GL {
 
 AmbientOcclusion::AmbientOcclusion(unsigned w, unsigned h, float):
-	occlude_target(w, h, (RENDER_COLOR,R8)),
+	rotate_lookup(get_or_create_rotate_lookup()),
+	occlude_target(w, h, (COLOR_ATTACHMENT,R8)),
 	occlude_shader(Resources::get_global().get<Program>("_ambientocclusion_occlude.glsl.shader")),
 	combine_shader(Resources::get_global().get<Program>("_ambientocclusion_combine.glsl.shader")),
 	quad(Resources::get_global().get<Mesh>("_fullscreen_quad.mesh")),
 	linear_sampler(Resources::get_global().get<Sampler>("_linear_clamp.samp")),
-	nearest_sampler(Resources::get_global().get<Sampler>("_nearest_clamp.samp"))
+	nearest_clamp_sampler(Resources::get_global().get<Sampler>("_nearest_clamp.samp")),
+	nearest_sampler(Resources::get_global().get<Sampler>("_nearest.samp"))
 {
-	unsigned seed = 1;
-	rotate_lookup.storage(RGBA8, 4, 4, 1);
+	set_n_samples(16);
+	set_occlusion_radius(0.5f);
+	set_darkness(1.0f);
+	set_edge_depth_threshold(0.1f);
+}
+
+const Texture2D &AmbientOcclusion::get_or_create_rotate_lookup()
+{
+	Resources &resources = Resources::get_global();
+
+	static const string name = "_ambientocclusion_rotate.tex";
+	Texture2D *rotate_lookup = resources.find<Texture2D>(name);
+	if(rotate_lookup)
+		return *rotate_lookup;
+
+	rotate_lookup = new Texture2D;
+	rotate_lookup->storage(RGBA8, 4, 4, 1);
+	resources.add(name, rotate_lookup);
+
 	unsigned char data[64];
 	for(unsigned i=0; i<16; ++i)
 	{
-		Geometry::Angle<float> a = Geometry::Angle<float>::from_turns(random(seed));
+		Geometry::Angle<float> a = Geometry::Angle<float>::from_turns(i*7/16.0f);
 		unsigned char c = (cos(a)*0.5f+0.5f)*255;
 		unsigned char s = (sin(a)*0.5f+0.5f)*255;
 		data[i*4  ] = c;
@@ -33,33 +52,32 @@ AmbientOcclusion::AmbientOcclusion(unsigned w, unsigned h, float):
 		data[i*4+2] = 255-s;
 		data[i*4+3] = ((i+i/4)%2)*255;
 	}
-	rotate_lookup.image(0, data);
+	rotate_lookup->image(0, data);
 
-	set_n_samples(16);
-	set_occlusion_radius(0.5f);
-	set_darkness(1.0f);
-	set_edge_depth_threshold(0.1f);
+	return *rotate_lookup;
 }
 
-float AmbientOcclusion::random(unsigned &seed)
+float AmbientOcclusion::radical_inverse(unsigned n)
 {
-	static const unsigned modulus = (1U<<31)-1;
-	seed = (static_cast<UInt64>(seed)*48271)%modulus;  // minstd
-	return static_cast<float>(seed)/(modulus-1);
+	unsigned inv = ((n&0x55)<<1) | ((n&0xAA)>>1);
+	inv = ((inv&0x33)<<2) | ((inv&0xCC)>>2);
+	inv = ((inv&0x0F)<<4) | ((inv&0xF0)>>4);
+	return inv/256.0f;
 }
 
 void AmbientOcclusion::set_n_samples(unsigned n)
 {
-	if(n<1 || n>32)
+	if(n<1 || n>128)
 		throw out_of_range("AmbientOcclusion::set_n_samples");
 
-	unsigned seed = 1;
-	float radius_divisor = (n-1)*(n-1);
-	Vector3 sample_points[32];
+	vector<Vector3> sample_points(n);
 	for(unsigned i=0; i<n; ++i)
 	{
-		Vector3 v(random(seed)-0.5f, random(seed)-0.5f, random(seed)-0.5f);
-		sample_points[i] = normalize(v)*(0.1f+0.9f*i*i/radius_divisor);
+		float r = static_cast<float>(i)/n;
+		float z = sqrt(1.0f-r*r);
+		float d = radical_inverse(i);
+		Geometry::Angle<float> a = Geometry::Angle<float>::from_turns(d);
+		sample_points[i] = Vector3(cos(a)*r, sin(a)*r, z)*(0.1f+0.9f*d*d);
 	}
 	shdata.uniform3_array("sample_points", n, &sample_points[0].x);
 	shdata.uniform("n_samples", static_cast<int>(n));
@@ -82,29 +100,33 @@ void AmbientOcclusion::set_edge_depth_threshold(float edt)
 
 void AmbientOcclusion::render(Renderer &renderer, const Texture2D &color, const Texture2D &depth)
 {
+	const Framebuffer *out_fbo = renderer.get_framebuffer();
+
 	Renderer::Push push(renderer);
-	renderer.set_texture("source", &color, &nearest_sampler);
-	renderer.set_texture("depth", &depth, &nearest_sampler);
-	renderer.set_texture("occlusion", &occlude_target.get_target_texture(RENDER_COLOR), &linear_sampler);
+	renderer.set_texture("source", &color, &nearest_clamp_sampler);
+	renderer.set_texture("depth", &depth, &nearest_clamp_sampler);
+	renderer.set_texture("occlusion", &occlude_target.get_target_texture(COLOR_ATTACHMENT), &linear_sampler);
 	renderer.set_texture("rotate", &rotate_lookup, &nearest_sampler);
 	renderer.set_shader_program(&occlude_shader, &shdata);
 
-	{
-		BindRestore bind_fbo(occlude_target.get_framebuffer());
-		quad.draw(renderer);
-	}
+	renderer.set_framebuffer(&occlude_target.get_framebuffer());
+	quad.draw(renderer);
 
+	renderer.set_framebuffer(out_fbo);
 	renderer.set_shader_program(&combine_shader);
 	quad.draw(renderer);
 }
 
+void AmbientOcclusion::set_debug_name(const string &name)
+{
+#ifdef DEBUG
+	occlude_target.set_debug_name(name+" [RT]");
+	shdata.set_debug_name(name+" [UBO]");
+#else
+	(void)name;
+#endif
+}
 
-AmbientOcclusion::Template::Template():
-	n_samples(16),
-	occlusion_radius(0.5f),
-	darkness(1.0f),
-	edge_depth_threshold(0.1f)
-{ }
 
 AmbientOcclusion *AmbientOcclusion::Template::create(unsigned width, unsigned height) const
 {