X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fshadowmap.cpp;h=7a761e7ad2bf15c6e35a5576f645f2980ab441c7;hb=b617c5d7b5283ad260a77f01e42e6170cabbc03d;hp=9b27ba08d5a5f9e7fff423a1544aaafe827c9018;hpb=41339bc44d076569c680b2c24c75b30ef1254c1b;p=libs%2Fgl.git

diff --git a/source/shadowmap.cpp b/source/shadowmap.cpp
index 9b27ba08..7a761e7a 100644
--- a/source/shadowmap.cpp
+++ b/source/shadowmap.cpp
@@ -24,6 +24,7 @@ ShadowMap::ShadowMap(unsigned s, const Scene &c, const Light &l):
 	size(s),
 	scene(c),
 	light(l),
+	unit(3),
 	radius(1)
 {
 	depth_buf.set_min_filter(LINEAR);
@@ -35,56 +36,71 @@ ShadowMap::ShadowMap(unsigned s, const Scene &c, const Light &l):
 	depth_buf.parameter(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 	depth_buf.parameter(GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 	fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
-	glDrawBuffer(GL_NONE);
+	draw_buffer(NO_BUFFER);
 	Framebuffer::unbind();
 	Texture::unbind();
 }
 
 void ShadowMap::set_target(const Vector3 &t, float r)
 {
-	target=t;
-	radius=r;
+	target = t;
+	radius = r;
+}
+
+void ShadowMap::set_texture_unit(unsigned u)
+{
+	unit = u;
 }
 
 void ShadowMap::prepare()
 {
-	const Vector4 &lpos=light.get_position();
+	Vector4 lpos = light.get_position();
 	if(lpos.w)
-		throw Exception("Non-directional lights not supported at the moment");
+	{
+		/* XXX Not really proper way to support positional lights, but good
+		enough when the light source is far away */
+		lpos.x -= target.x;
+		lpos.y -= target.y;
+		lpos.z -= target.z;
+		float d = sqrt(lpos.x*lpos.x+lpos.y*lpos.y+lpos.z*lpos.z);
+		lpos.x /= d;
+		lpos.y /= d;
+		lpos.z /= d;
+	}
 
 	float matrix[16];
 	if(abs(lpos.z)>=abs(lpos.x) && abs(lpos.z)>=abs(lpos.y))
 	{
-		float d=sqrt(lpos.x*lpos.x+lpos.z*lpos.z);
-		matrix[0]=lpos.z/d;
-		matrix[4]=0;
-		matrix[8]=-lpos.x/d;
-		matrix[1]=-lpos.x*lpos.y/d;
-		matrix[5]=d;
-		matrix[9]=-lpos.z*lpos.y/d;
+		float d = sqrt(lpos.x*lpos.x+lpos.z*lpos.z);
+		matrix[0] = lpos.z/d;
+		matrix[4] = 0;
+		matrix[8] = -lpos.x/d;
+		matrix[1] = -lpos.x*lpos.y/d;
+		matrix[5] = d;
+		matrix[9] = -lpos.z*lpos.y/d;
 	}
 	else
 	{
-		float d=sqrt(lpos.x*lpos.x+lpos.y*lpos.y);
-		matrix[0]=-lpos.y/d;
-		matrix[4]=lpos.x/d;
-		matrix[8]=0;
-		matrix[1]=-lpos.x*lpos.z/d;
-		matrix[5]=-lpos.y*lpos.z/d;
-		matrix[9]=d;
+		float d = sqrt(lpos.x*lpos.x+lpos.y*lpos.y);
+		matrix[0] = -lpos.y/d;
+		matrix[4] = lpos.x/d;
+		matrix[8] = 0;
+		matrix[1] = -lpos.x*lpos.z/d;
+		matrix[5] = -lpos.y*lpos.z/d;
+		matrix[9] = d;
 	}
 
-	matrix[2]=lpos.x;
-	matrix[6]=lpos.y;
-	matrix[10]=lpos.z;
+	matrix[2] = lpos.x;
+	matrix[6] = lpos.y;
+	matrix[10] = lpos.z;
 
-	matrix[12]=-(target.x*matrix[0]+target.y*matrix[4]+target.z*matrix[8]);
-	matrix[13]=-(target.x*matrix[1]+target.y*matrix[5]+target.z*matrix[9]);
-	matrix[14]=-(target.x*matrix[2]+target.y*matrix[6]+target.z*matrix[10]);
-	matrix[3]=0;
-	matrix[7]=0;
-	matrix[11]=0;
-	matrix[15]=1;
+	matrix[12] = -(target.x*matrix[0]+target.y*matrix[4]+target.z*matrix[8]);
+	matrix[13] = -(target.x*matrix[1]+target.y*matrix[5]+target.z*matrix[9]);
+	matrix[14] = -(target.x*matrix[2]+target.y*matrix[6]+target.z*matrix[10]);
+	matrix[3] = 0;
+	matrix[7] = 0;
+	matrix[11] = 0;
+	matrix[15] = 1;
 
 	{
 		matrix_mode(PROJECTION);
@@ -95,22 +111,26 @@ void ShadowMap::prepare()
 		push_matrix();
 		load_matrix(matrix);
 
-		Bind _bind_fbo(fbo);
-		glViewport(0, 0, size, size);
-		glClear(GL_DEPTH_BUFFER_BIT);
-		scene.render();
+		const Framebuffer *old_fbo = Framebuffer::current();
+		fbo.bind();
+		clear(DEPTH_BUFFER_BIT);
+		scene.render("shadow");
 
 		matrix_mode(PROJECTION);
 		pop_matrix();
 		matrix_mode(MODELVIEW);
 		pop_matrix();
+		if(old_fbo)
+			old_fbo->bind();
+		else
+			Framebuffer::unbind();
 	}
 
-	depth_buf.bind_to(3);
-	float diam=radius*2;
-	float s_eq[4]={ matrix[0]/diam, matrix[4]/diam, matrix[8]/diam, matrix[12]/diam+0.5 };
-	float t_eq[4]={ matrix[1]/diam, matrix[5]/diam, matrix[9]/diam, matrix[13]/diam+0.5 };
-	float r_eq[4]={ -matrix[2]/diam, -matrix[6]/diam, -matrix[10]/diam, 0.5-matrix[14]/diam-4.0/size };
+	depth_buf.bind_to(unit);
+	float diam = radius*2;
+	float s_eq[4] = { matrix[0]/diam, matrix[4]/diam, matrix[8]/diam, matrix[12]/diam+0.5 };
+	float t_eq[4] = { matrix[1]/diam, matrix[5]/diam, matrix[9]/diam, matrix[13]/diam+0.5 };
+	float r_eq[4] = { -matrix[2]/diam, -matrix[6]/diam, -matrix[10]/diam, 0.5-matrix[14]/diam-4.0/size };
 	glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
 	glTexGenfv(GL_S, GL_EYE_PLANE, s_eq);
 	enable(GL_TEXTURE_GEN_S);
@@ -126,7 +146,7 @@ void ShadowMap::prepare()
 
 void ShadowMap::cleanup()
 {
-	TexUnit::activate(3);
+	TexUnit::activate(unit);
 	Texture::unbind();
 	disable(GL_TEXTURE_GEN_S);
 	disable(GL_TEXTURE_GEN_T);