example/viewing_system: add "viewer" concept
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6836790205
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@ -19,6 +19,7 @@
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#include "geometry/geometry.hpp"
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#include "geometry/suzanne2.hpp"
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#include "geometry/plane2.hpp"
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#include "viewing_system/view_space.hpp"
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#include "viewing_system/screen_space.hpp"
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@ -28,17 +29,15 @@ uint32_t _ta_parameter_buf[((32 * 8192) + 32) / 4];
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struct viewer {
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vec3 position;
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vec3 orientation;
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float azimuth;
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float colatitude;
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};
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constexpr mat4x4 world_transform = { 1.f, 0.f, 0.f, 0.f,
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0.f, 1.f, 0.f, 0.f,
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0.f, 0.f, 1.f, 3.f,
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0.f, 0.f, 0.f, 1.f };
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void ta_upload(ta_parameter_writer& parameter,
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const position__color * vertices,
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const face_vtn * faces,
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const uint32_t num_faces,
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const mat4x4 world_transform,
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const mat4x4 screen_transform
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)
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{
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@ -80,7 +79,7 @@ void ta_upload(ta_parameter_writer& parameter,
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vec4 v = transform * vertex;
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float x = v.x / v.w;
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float y = v.y / v.w;
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float y = -v.y / v.w;
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float z = v.w / v.z;
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x = x * 240.f + 320.f;
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@ -145,46 +144,67 @@ void main()
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core_init();
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init_texture_memory(opb_size);
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viewer viewer {
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.position = {0.f, -3.f, 0.f},
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.orientation = {0.f, -1.f, 0.f}, // approximate "up" orientation
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};
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vec3 plane_normal = view_space::viewing_direction(pi / 2.f, // azimuth
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pi / 4.f // colatitude
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);
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vec3 up_vector = view_space::project_vector_to_plane(plane_normal,
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viewer.orientation
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);
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const mat4x4 view_space_transform = view_space::transformation_matrix(viewer.position,
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plane_normal,
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up_vector);
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const mat4x4 perspective_transform = screen_space::transformation_matrix(1.f, // the z-coordinate of the view window
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100.f, // the z-coordinate of the far clip plane
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1.f // the dimension of the square view window
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);
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const mat4x4 screen_transform = perspective_transform * view_space_transform;
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float delta = 0;
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uint32_t frame_ix = 0;
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constexpr uint32_t num_frames = 1;
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while (true) {
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viewer viewer {
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.position = {0.f, -1.f, -2.f},
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.orientation = {0.f, -1.f, 0.f}, // approximate "up" orientation
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.azimuth = 0,
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.colatitude = pi / 4.f * sin(delta) * 0.9f,
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};
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const vec3 plane_normal = view_space::viewing_direction(viewer.azimuth, viewer.colatitude);
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const vec3 up_vector = view_space::project_vector_to_plane(plane_normal, viewer.orientation);
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const mat4x4 view_space_transform = view_space::transformation_matrix(viewer.position, plane_normal, up_vector);
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const mat4x4 perspective_transform = screen_space::transformation_matrix(1.f, // the z-coordinate of the view window
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100.f, // the z-coordinate of the far clip plane
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1.f // the dimension of the square view window
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);
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const mat4x4 screen_transform = perspective_transform * view_space_transform;
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ta_polygon_converter_init(opb_size.total(),
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ta_alloc,
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640 / 32,
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480 / 32);
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auto parameter = ta_parameter_writer(ta_parameter_buf);
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ta_upload(parameter,
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suzanne::vertices,
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suzanne::faces,
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suzanne::num_faces,
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screen_transform
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);
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{
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constexpr mat4x4 world_transform = { 1.f, 0.f, 0.f, 0.f,
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0.f, 1.f, 0.f, 0.f,
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0.f, 0.f, 1.f, 3.f,
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0.f, 0.f, 0.f, 1.f };
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ta_upload(parameter,
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suzanne::vertices,
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suzanne::faces,
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suzanne::num_faces,
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world_transform,
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screen_transform
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);
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}
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{
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constexpr mat4x4 world_transform = { 0.1f, 0.f, 0.f, 0.f,
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0.f, 0.1f, 0.f, 1.2f,
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0.f, 0.f, 0.1f, 3.f,
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0.f, 0.f, 0.f, 1.f };
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ta_upload(parameter,
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plane::vertices,
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plane::faces,
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plane::num_faces,
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world_transform,
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screen_transform
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);
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}
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// end of opaque list
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parameter.append<ta_global_parameter::end_of_list>() = ta_global_parameter::end_of_list(para_control::para_type::end_of_list);
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@ -194,9 +214,10 @@ void main()
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core_start_render(frame_ix, num_frames);
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v_sync_in();
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v_sync_out();
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core_wait_end_of_render_video(frame_ix, num_frames);
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frame_ix += 1;
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delta += pi * 2 / 360;
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}
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}
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31
geometry/plane2.hpp
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31
geometry/plane2.hpp
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@ -0,0 +1,31 @@
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#pragma once
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#include "geometry.hpp"
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namespace plane {
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constexpr position__color vertices[] = {
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{ {-10.000000f, 0.000000f, -10.000000f}, { 0.011800f, 1.000000f, 1.000000f} },
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{ {10.000000f, 0.000000f, -10.000000f}, { 1.000000f, 0.003900f, 0.066700f} },
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{ {-10.000000f, 0.000000f, 10.000000f}, { 0.019600f, 1.000000f, 0.019600f} },
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{ {10.000000f, 0.000000f, 10.000000f}, { 1.000000f, 0.952900f, 0.011800f} },
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};
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constexpr vec2 texture[] = {
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{ 1.000000f, 0.000000f },
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{ 0.000000f, 1.000000f },
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{ 0.000000f, 0.000000f },
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{ 1.000000f, 1.000000f },
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};
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constexpr vec3 normals[] = {
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{ -0.000000f, -1.000000f, -0.000000f },
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};
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constexpr face_vtn faces[] = {
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{{1, 0, 0}, {2, 1, 0}, {0, 2, 0}},
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{{1, 0, 0}, {3, 3, 0}, {2, 1, 0}},
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};
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constexpr uint32_t num_faces = (sizeof (faces)) / (sizeof (face_vtn));
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}
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15
geometry/plane2.obj
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15
geometry/plane2.obj
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@ -0,0 +1,15 @@
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# Blender 3.3.6
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# www.blender.org
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o Plane
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v -10.000000 0.000000 -10.000000 0.0118 1.0000 1.0000
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v 10.000000 0.000000 -10.000000 1.0000 0.0039 0.0667
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v -10.000000 0.000000 10.000000 0.0196 1.0000 0.0196
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v 10.000000 0.000000 10.000000 1.0000 0.9529 0.0118
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vn -0.0000 -1.0000 -0.0000
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vt 0.000000 0.000000
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vt 1.000000 0.000000
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vt 0.000000 1.000000
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vt 1.000000 1.000000
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s 0
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f 2/2/1 3/3/1 1/1/1
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f 2/2/1 4/4/1 3/3/1
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