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Precompute projection matrices when rendering 2D shadows
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@clayjohn
clayjohn committed Oct 18, 2024
1 parent 4631a61 commit 62516df
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Showing 2 changed files with 55 additions and 37 deletions.
45 changes: 28 additions & 17 deletions drivers/gles3/rasterizer_canvas_gles3.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1654,28 +1654,39 @@ void RasterizerCanvasGLES3::light_update_shadow(RID p_rid, int p_shadow_index, c
return;
}

for (int i = 0; i < 4; i++) {
glViewport((state.shadow_texture_size / 4) * i, p_shadow_index * 2, (state.shadow_texture_size / 4), 2);
Projection projection;
{
real_t fov = 90;
real_t nearp = p_near;
real_t farp = p_far;
real_t aspect = 1.0;

Projection projection;
{
real_t fov = 90;
real_t nearp = p_near;
real_t farp = p_far;
real_t aspect = 1.0;
real_t ymax = nearp * Math::tan(Math::deg_to_rad(fov * 0.5));
real_t ymin = -ymax;
real_t xmin = ymin * aspect;
real_t xmax = ymax * aspect;

real_t ymax = nearp * Math::tan(Math::deg_to_rad(fov * 0.5));
real_t ymin = -ymax;
real_t xmin = ymin * aspect;
real_t xmax = ymax * aspect;
projection.set_frustum(xmin, xmax, ymin, ymax, nearp, farp);
}

projection.set_frustum(xmin, xmax, ymin, ymax, nearp, farp);
}
// Precomputed:
// Vector3 cam_target = Basis::from_euler(Vector3(0, 0, Math_TAU * ((i + 3) / 4.0))).xform(Vector3(0, 1, 0));
// projection = projection * Projection(Transform3D().looking_at(cam_targets[i], Vector3(0, 0, -1)).affine_inverse());
const Projection projections[4] = {
projection * Projection(Vector4(0, 0, -1, 0), Vector4(1, 0, 0, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

Vector3 cam_target = Basis::from_euler(Vector3(0, 0, Math_TAU * ((i + 3) / 4.0))).xform(Vector3(0, 1, 0));
projection * Projection(Vector4(-1, 0, 0, 0), Vector4(0, 0, -1, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

projection * Projection(Vector4(0, 0, 1, 0), Vector4(-1, 0, 0, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

projection * Projection(Vector4(1, 0, 0, 0), Vector4(0, 0, 1, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1))

};

for (int i = 0; i < 4; i++) {
glViewport((state.shadow_texture_size / 4) * i, p_shadow_index * 2, (state.shadow_texture_size / 4), 2);

projection = projection * Projection(Transform3D().looking_at(cam_target, Vector3(0, 0, -1)).affine_inverse());
shadow_render.shader.version_set_uniform(CanvasOcclusionShaderGLES3::PROJECTION, projection, shadow_render.shader_version, variant);
shadow_render.shader.version_set_uniform(CanvasOcclusionShaderGLES3::PROJECTION, projections[i], shadow_render.shader_version, variant);

static const Vector2 directions[4] = { Vector2(1, 0), Vector2(0, 1), Vector2(-1, 0), Vector2(0, -1) };
shadow_render.shader.version_set_uniform(CanvasOcclusionShaderGLES3::DIRECTION, directions[i].x, directions[i].y, shadow_render.shader_version, variant);
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47 changes: 27 additions & 20 deletions servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -993,36 +993,43 @@ void RendererCanvasRenderRD::light_update_shadow(RID p_rid, int p_shadow_index,
Vector<Color> cc;
cc.push_back(Color(p_far, p_far, p_far, 1.0));

for (int i = 0; i < 4; i++) {
//make sure it remains orthogonal, makes easy to read angle later
Projection projection;
{
real_t fov = 90;
real_t nearp = p_near;
real_t farp = p_far;
real_t aspect = 1.0;

//light.basis.scale(Vector3(to_light.elements[0].length(),to_light.elements[1].length(),1));
real_t ymax = nearp * Math::tan(Math::deg_to_rad(fov * 0.5));
real_t ymin = -ymax;
real_t xmin = ymin * aspect;
real_t xmax = ymax * aspect;

Rect2i rect((state.shadow_texture_size / 4) * i, p_shadow_index * 2, (state.shadow_texture_size / 4), 2);
RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(state.shadow_fb, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_STORE, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_DISCARD, cc, 1.0, 0, rect);
projection.set_frustum(xmin, xmax, ymin, ymax, nearp, farp);
}

Projection projection;
{
real_t fov = 90;
real_t nearp = p_near;
real_t farp = p_far;
real_t aspect = 1.0;
// Precomputed:
// Vector3 cam_target = Basis::from_euler(Vector3(0, 0, Math_TAU * ((i + 3) / 4.0))).xform(Vector3(0, 1, 0));
// projection = projection * Projection(Transform3D().looking_at(cam_targets[i], Vector3(0, 0, -1)).affine_inverse());
const Projection projections[4] = {
projection * Projection(Vector4(0, 0, -1, 0), Vector4(1, 0, 0, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

real_t ymax = nearp * Math::tan(Math::deg_to_rad(fov * 0.5));
real_t ymin = -ymax;
real_t xmin = ymin * aspect;
real_t xmax = ymax * aspect;
projection * Projection(Vector4(-1, 0, 0, 0), Vector4(0, 0, -1, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

projection.set_frustum(xmin, xmax, ymin, ymax, nearp, farp);
}
projection * Projection(Vector4(0, 0, 1, 0), Vector4(-1, 0, 0, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1)),

projection * Projection(Vector4(1, 0, 0, 0), Vector4(0, 0, 1, 0), Vector4(0, -1, 0, 0), Vector4(0, 0, 0, 1))

};

Vector3 cam_target = Basis::from_euler(Vector3(0, 0, Math_TAU * ((i + 3) / 4.0))).xform(Vector3(0, 1, 0));
projection = projection * Projection(Transform3D().looking_at(cam_target, Vector3(0, 0, -1)).affine_inverse());
for (int i = 0; i < 4; i++) {
Rect2i rect((state.shadow_texture_size / 4) * i, p_shadow_index * 2, (state.shadow_texture_size / 4), 2);
RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(state.shadow_fb, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_STORE, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_DISCARD, cc, 1.0, 0, rect);

ShadowRenderPushConstant push_constant;
for (int y = 0; y < 4; y++) {
for (int x = 0; x < 4; x++) {
push_constant.projection[y * 4 + x] = projection.columns[y][x];
push_constant.projection[y * 4 + x] = projections[i].columns[y][x];
}
}
static const Vector2 directions[4] = { Vector2(1, 0), Vector2(0, 1), Vector2(-1, 0), Vector2(0, -1) };
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