-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2009 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
#include <cmath>
#include <cstdlib>
+#include "camera.h"
#include "light.h"
-#include "matrix.h"
-#include "misc.h"
-#include "projection.h"
+#include "renderer.h"
#include "scene.h"
#include "shadowmap.h"
-#include "texunit.h"
+#include "tests.h"
using namespace std;
namespace Msp {
namespace GL {
-ShadowMap::ShadowMap(unsigned s, const Scene &c, const Light &l):
+ShadowMap::ShadowMap(unsigned s, Renderable &r, const Light &l):
+ Effect(r),
size(s),
- scene(c),
light(l),
- radius(1)
+ radius(1),
+ depth_bias(4),
+ rendered(false)
{
depth_buf.set_min_filter(LINEAR);
- depth_buf.storage(DEPTH_COMPONENT, size, size, 0);
- depth_buf.image(0, DEPTH_COMPONENT, UNSIGNED_BYTE, 0);
- depth_buf.parameter(GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE);
- depth_buf.parameter(GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
- depth_buf.parameter(GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
- depth_buf.parameter(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- depth_buf.parameter(GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ 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, 1);
fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
- glDrawBuffer(GL_NONE);
- Framebuffer::unbind();
- Texture::unbind();
+ fbo.require_complete();
+
+ set_darkness(0.7);
}
void ShadowMap::set_target(const Vector3 &t, float r)
{
- target=t;
- radius=r;
+ target = t;
+ radius = r;
}
-void ShadowMap::prepare()
+void ShadowMap::set_darkness(float d)
{
- const Vector4 &lpos=light.get_position();
- if(lpos.w)
- throw Exception("Non-directional lights not supported at the moment");
-
- 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;
-
- {
- matrix_mode(PROJECTION);
- push_matrix();
- load_identity();
- ortho(-radius, radius, -radius, radius, -radius, radius);
- matrix_mode(MODELVIEW);
- push_matrix();
- load_matrix(matrix);
-
- Bind _bind_fbo(fbo);
- glViewport(0, 0, size, size);
- glClear(GL_DEPTH_BUFFER_BIT);
- scene.render();
-
- matrix_mode(PROJECTION);
- pop_matrix();
- matrix_mode(MODELVIEW);
- pop_matrix();
- }
-
- 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 };
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
- glTexGenfv(GL_S, GL_EYE_PLANE, s_eq);
- enable(GL_TEXTURE_GEN_S);
- glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
- glTexGenfv(GL_T, GL_EYE_PLANE, t_eq);
- enable(GL_TEXTURE_GEN_T);
- glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
- glTexGenfv(GL_R, GL_EYE_PLANE, r_eq);
- enable(GL_TEXTURE_GEN_R);
-
- TexUnit::activate(0);
+ if(d<0.0f || d>1.0f)
+ throw invalid_argument("ShadowMap::set_darkness");
+
+ shdata.uniform("shadow_darkness", d);
+}
+
+void ShadowMap::set_depth_bias(float b)
+{
+ if(b<0.0f)
+ throw invalid_argument("ShadowMap::set_depth_bias");
+
+ depth_bias = b;
}
-void ShadowMap::cleanup()
+void ShadowMap::setup_frame(Renderer &renderer)
{
- TexUnit::activate(3);
- Texture::unbind();
- disable(GL_TEXTURE_GEN_S);
- disable(GL_TEXTURE_GEN_T);
- disable(GL_TEXTURE_GEN_R);
- TexUnit::activate(0);
+ if(rendered)
+ return;
+
+ rendered = 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);
+
+ Renderer::Push push(renderer);
+ renderer.set_camera(camera);
+
+ renderer.render(renderable, "shadow");
+}
+
+void ShadowMap::finish_frame()
+{
+ renderable.finish_frame();
+ rendered = false;
+}
+
+void ShadowMap::render(Renderer &renderer, const Tag &tag) const
+{
+ if(!enabled_passes.count(tag))
+ return renderer.render(renderable, tag);
+
+ Renderer::Push _push_rend(renderer);
+
+ unsigned unit = renderer.allocate_effect_texunit();
+ int iunit = unit;
+ shdata.uniform("shadow", iunit);
+
+ 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.add_shader_data(shdata);
+ renderer.render(renderable, tag);
}
} // namespace GL
projects / libs / gl.git / blobdiff