X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fshadowmap.cpp;h=8151a7cffe48c41429005470ac3595916fb309e1;hb=db2fd517dcd215e9d16345287d413f2a64f5ba03;hp=737423f7ff3687fd5e6c95870f2ad854623128c5;hpb=a8c9bac7217e1750ce7578600429d16e8010d8b1;p=libs%2Fgl.git

diff --git a/source/shadowmap.cpp b/source/shadowmap.cpp
index 737423f7..8151a7cf 100644
--- a/source/shadowmap.cpp
+++ b/source/shadowmap.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <cstdlib>
+#include "camera.h"
 #include "light.h"
 #include "matrix.h"
 #include "misc.h"
@@ -32,7 +33,6 @@ ShadowMap::ShadowMap(unsigned s, const Renderable &r, const Light &l):
 	fbo.require_complete();
 
 	set_darkness(0.7);
-	set_texture_unit(3);
 }
 
 void ShadowMap::set_target(const Vector3 &t, float r)
@@ -57,15 +57,6 @@ void ShadowMap::set_depth_bias(float b)
 	depth_bias = b;
 }
 
-void ShadowMap::set_texture_unit(unsigned u)
-{
-	unit = u;
-
-	int i = unit;
-	shdata.uniform("shadow", i);
-	shdata.uniform("shadow_unit", i);
-}
-
 void ShadowMap::setup_frame() const
 {
 	if(rendered)
@@ -108,6 +99,11 @@ void ShadowMap::setup_frame() const
 	MatrixStack::projection() = Matrix::ortho(-radius, radius, -radius, radius, -radius, radius);
 	MatrixStack::modelview() = view_matrix;
 
+	shadow_matrix = light_matrix;
+	shadow_matrix.scale(radius*2, radius*2, -radius*2);
+	shadow_matrix.translate(-0.5, -0.5, depth_bias/size-0.5);
+	shadow_matrix.invert();
+
 	Bind bind_fbo(fbo, true);
 	Bind bind_depth(DepthTest::lequal());
 	fbo.clear(DEPTH_BUFFER_BIT);
@@ -125,20 +121,29 @@ void ShadowMap::render(Renderer &renderer, const Tag &tag) const
 	if(!enabled_passes.count(tag))
 		return renderer.render(renderable, tag);
 
-	const float *matrix = view_matrix.data();
+	Renderer::Push _push_rend(renderer);
+
+	unsigned unit = renderer.allocate_effect_texunit();
+	int iunit = unit;
+	shdata.uniform("shadow", iunit);
+	shdata.uniform("shadow_unit", iunit);
 
-	// Has side effect of changing the current unit
 	depth_buf.bind_to(unit);
-	float diam = radius*2;
 	TexGen tg_s, tg_t, tg_r;
-	tg_s.set_plane(Vector4(matrix[0]/diam, matrix[4]/diam, matrix[8]/diam, matrix[12]/diam+0.5f));
-	tg_t.set_plane(Vector4(matrix[1]/diam, matrix[5]/diam, matrix[9]/diam, matrix[13]/diam+0.5f));
-	tg_r.set_plane(Vector4(-matrix[2]/diam, -matrix[6]/diam, -matrix[10]/diam, 0.5f-matrix[14]/diam-depth_bias/size));
+	tg_s.set_plane(Vector4(shadow_matrix(0, 0), shadow_matrix(0, 1), shadow_matrix(0, 2), shadow_matrix(0, 3)));
+	tg_t.set_plane(Vector4(shadow_matrix(1, 0), shadow_matrix(1, 1), shadow_matrix(1, 2), shadow_matrix(1, 3)));
+	tg_r.set_plane(Vector4(shadow_matrix(2, 0), shadow_matrix(2, 1), shadow_matrix(2, 2), shadow_matrix(2, 3)));
 	tg_s.bind_to(unit, SCOORD);
 	tg_t.bind_to(unit, TCOORD);
 	tg_r.bind_to(unit, RCOORD);
 
-	Renderer::Push _push_rend(renderer);
+	if(const Camera *camera = renderer.get_camera())
+		/* Multiply by camera's object matrix to form a matrix that transforms
+		from eye space to shadow space. */
+		shdata.uniform("shd_eye_matrix", shadow_matrix*camera->get_object_matrix());
+	else
+		shdata.uniform("shd_eye_matrix", shadow_matrix);
+
 	renderer.add_shader_data(shdata);
 	renderer.render(renderable, tag);