X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fshadowmap.cpp;h=921a1747875b4bf0b349042dac6aab26095cff84;hp=91c056fe147cc4c994100b5a1aa1e2ec8534c730;hb=639238c53510fb9483e92fb1b808d33fce992bff;hpb=fa5b232a16e11d7950e80764497f0167ec9e3b41

diff --git a/source/shadowmap.cpp b/source/shadowmap.cpp
index 91c056fe..921a1747 100644
--- a/source/shadowmap.cpp
+++ b/source/shadowmap.cpp
@@ -1,21 +1,18 @@
 #include <cmath>
 #include <cstdlib>
+#include "camera.h"
 #include "light.h"
-#include "matrix.h"
-#include "misc.h"
 #include "renderer.h"
 #include "scene.h"
 #include "shadowmap.h"
 #include "tests.h"
-#include "texgen.h"
-#include "texunit.h"
 
 using namespace std;
 
 namespace Msp {
 namespace GL {
 
-ShadowMap::ShadowMap(unsigned s, const Renderable &r, const Light &l):
+ShadowMap::ShadowMap(unsigned s, Renderable &r, const Light &l):
 	Effect(r),
 	size(s),
 	light(l),
@@ -27,12 +24,11 @@ ShadowMap::ShadowMap(unsigned s, const Renderable &r, const Light &l):
 	depth_buf.set_compare_enabled(true);
 	depth_buf.set_compare_func(LEQUAL);
 	depth_buf.set_wrap(CLAMP_TO_EDGE);
-	depth_buf.storage(DEPTH_COMPONENT, size, size);
+	depth_buf.storage(DEPTH_COMPONENT, size, size, 1);
 	fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
 	fbo.require_complete();
 
 	set_darkness(0.7);
-	set_texture_unit(3);
 }
 
 void ShadowMap::set_target(const Vector3 &t, float r)
@@ -57,83 +53,38 @@ 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
+void ShadowMap::setup_frame(Renderer &renderer)
 {
 	if(rendered)
 		return;
 
-	renderable.setup_frame();
 	rendered = true;
-
-	Vector4 lpos = light.get_position();
-
-	if(lpos.w)
-	{
-		/* XXX Not really proper way to support positional lights, but good
-		enough when the light source is far away */
-		lpos -= Vector4(target.x, target.y, target.z, 1.0f);
-	}
-
-	lpos.normalize();
-
-	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;
-	}
-	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;
-	}
-
-	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;
-
-	light_matrix = matrix;
-
-	MatrixStack::Push push_mv(MatrixStack::modelview());
-	MatrixStack::Push push_proj(MatrixStack::projection());
-
-	MatrixStack::projection() = Matrix::ortho(-radius, radius, -radius, radius, -radius, radius);
-	MatrixStack::modelview() = light_matrix;
-
-	Bind bind_fbo(fbo, true);
+	renderable.setup_frame(renderer);
+
+	Camera camera;
+	camera.set_object_matrix(*light.get_matrix());
+	camera.set_position(target);
+	// TODO support point and spot lights with a frustum projection.
+	// Omnidirectional lights also need a cube shadow map.
+	camera.set_orthographic(radius*2, radius*2);
+	camera.set_depth_clip(-radius, radius);
+
+	shadow_matrix = camera.get_object_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();
+
+	BindRestore bind_fbo(fbo);
 	Bind bind_depth(DepthTest::lequal());
 	fbo.clear(DEPTH_BUFFER_BIT);
-	renderable.render("shadow");
+
+	Renderer::Push push(renderer);
+	renderer.set_camera(camera);
+
+	renderer.render(renderable, "shadow");
 }
 
-void ShadowMap::finish_frame() const
+void ShadowMap::finish_frame()
 {
 	renderable.finish_frame();
 	rendered = false;
@@ -144,29 +95,23 @@ void ShadowMap::render(Renderer &renderer, const Tag &tag) const
 	if(!enabled_passes.count(tag))
 		return renderer.render(renderable, tag);
 
-	const float *matrix = light_matrix.data();
+	Renderer::Push _push_rend(renderer);
+
+	unsigned unit = renderer.allocate_effect_texunit();
+	int iunit = unit;
+	shdata.uniform("shadow", 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.bind_to(SCOORD);
-	tg_t.bind_to(TCOORD);
-	tg_r.bind_to(RCOORD);
-	TexUnit::activate(0);
+	Bind _bind_depth(depth_buf, unit);
+
+	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::Push _push_rend(renderer);
 	renderer.add_shader_data(shdata);
 	renderer.render(renderable, tag);
-
-	Texture::unbind_from(unit);
-	TexGen::unbind_from(SCOORD);
-	TexGen::unbind_from(TCOORD);
-	TexGen::unbind_from(RCOORD);
-	TexUnit::activate(0);
 }
 
 } // namespace GL