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[libs/gl.git] / source / environmentmap.cpp
1 #include <cmath>
2 #include "environmentmap.h"
3 #include "renderer.h"
4 #include "texunit.h"
5
6 namespace Msp {
7 namespace GL {
8
9 EnvironmentMap::EnvironmentMap(unsigned s, Renderable &r, Renderable &e):
10         Effect(r),
11         size(s),
12         environment(e),
13         rendered(false)
14 {
15         env_tex.storage(RGB, size);
16         env_tex.set_wrap(CLAMP_TO_EDGE);
17         env_tex.set_min_filter(LINEAR);
18         depth_buf.storage(DEPTH_COMPONENT, size, size);
19         for(unsigned i=0; i<6; ++i)
20         {
21                 fbo[i].attach(COLOR_ATTACHMENT0, env_tex, TextureCube::enumerate_faces(i), 0);
22                 fbo[i].attach(DEPTH_ATTACHMENT, depth_buf);
23                 fbo[i].require_complete();
24         }
25
26         // XXX Make the depth range configurable
27         camera.set_field_of_view(Geometry::Angle<float>::right());
28         camera.set_aspect(1);
29         camera.set_depth_clip(0.1, 100);
30
31         shdata.uniform("environment", 4);
32 }
33
34 void EnvironmentMap::setup_frame() const
35 {
36         if(rendered)
37                 return;
38
39         rendered = true;
40         renderable.setup_frame();
41         environment.setup_frame();
42
43         const Matrix *matrix = renderable.get_matrix();
44         Vector3 position = (*matrix)*Vector3();
45         camera.set_position(position);
46         for(unsigned i=0; i<6; ++i)
47         {
48                 TextureCubeFace face = TextureCube::enumerate_faces(i);
49                 fbo[i].bind();
50                 fbo[i].clear(COLOR_BUFFER_BIT|DEPTH_BUFFER_BIT);
51                 camera.set_look_direction(env_tex.get_face_direction(face));
52                 camera.set_up_direction(env_tex.get_t_direction(face));
53                 Renderer env_renderer(&camera);
54                 env_renderer.exclude(renderable);
55                 env_renderer.render(environment);
56         }
57         Framebuffer::unbind();
58 }
59
60 void EnvironmentMap::finish_frame() const
61 {
62         if(rendered)
63         {
64                 rendered = false;
65                 renderable.finish_frame();
66                 environment.finish_frame();
67         }
68 }
69
70 void EnvironmentMap::render(Renderer &renderer, const Tag &tag) const
71 {
72         if(!enabled_passes.count(tag))
73                 return renderer.render(renderable, tag);
74
75         const Matrix &view_matrix = renderer.get_camera()->get_matrix();
76         // XXX The camera should maybe have store its own object matrix
77         float env_mdata[9];
78         env_mdata[0] = view_matrix[0];
79         env_mdata[1] = view_matrix[4];
80         env_mdata[2] = view_matrix[8];
81         env_mdata[3] = view_matrix[1];
82         env_mdata[4] = view_matrix[5];
83         env_mdata[5] = view_matrix[9];
84         env_mdata[6] = view_matrix[2];
85         env_mdata[7] = view_matrix[6];
86         env_mdata[8] = view_matrix[10];
87         shdata.uniform_matrix3("env_eye_matrix", env_mdata);
88
89         env_tex.bind_to(4);
90         TexUnit::activate(0);
91
92         Renderer::Push _push_rend(renderer);
93         renderer.add_shader_data(shdata);
94         renderer.render(renderable, tag);
95
96         env_tex.unbind_from(4);
97         TexUnit::activate(0);
98 }
99
100 } // namespace GL
101 } // namespace Msp