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Use double emulation on modelview

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celyk
2025-06-24 15:37:18 +10:00
parent 88b9932ce1
commit 7f9b8dae4f
2 changed files with 46 additions and 34 deletions
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36
servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl
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@@ -404,7 +404,27 @@ void vertex_shader(vec3 vertex_input,
float roughness_highp = 1.0;
#ifdef USE_DOUBLE_PRECISION
mat4 modelview = scene_data.view_matrix * model_matrix;
// We separate the basis from the origin because the basis is fine with single point precision.
// Then we combine the translations from the model matrix and the view matrix using emulated doubles.
// We add the result to the vertex and ignore the final lost precision.
vec3 model_origin = model_matrix[3].xyz;
if (sc_multimesh()) {
modelview = modelview * matrix;
vec3 instance_origin = mat3(model_matrix) * matrix[3].xyz;
model_origin = double_add_vec3(model_origin, model_precision, instance_origin, vec3(0.0), model_precision);
}
// Overwrite the translation part of modelview with improved precision.
vec3 temp_precision; // Will be ignored.
modelview[3].xyz = double_add_vec3(model_origin, model_precision, scene_data.inv_view_matrix[3].xyz, view_precision, temp_precision);
modelview[3].xyz = mat3(scene_data.view_matrix) * modelview[3].xyz;
#else
mat4 modelview = scene_data.view_matrix * model_matrix;
#endif
mat3 modelview_normal = mat3(scene_data.view_matrix) * model_normal_matrix;
mat4 read_view_matrix = scene_data.view_matrix;
vec2 read_viewport_size = scene_data.viewport_size;
@@ -421,22 +441,8 @@ void vertex_shader(vec3 vertex_input,
// using local coordinates (default)
#if !defined(SKIP_TRANSFORM_USED) && !defined(VERTEX_WORLD_COORDS_USED)
#ifdef USE_DOUBLE_PRECISION
// We separate the basis from the origin because the basis is fine with single point precision.
// Then we combine the translations from the model matrix and the view matrix using emulated doubles.
// We add the result to the vertex and ignore the final lost precision.
vec3 model_origin = model_matrix[3].xyz;
if (sc_multimesh()) {
vertex = mat3(matrix) * vertex;
model_origin = double_add_vec3(model_origin, model_precision, matrix[3].xyz, vec3(0.0), model_precision);
}
vertex = mat3(inv_view_matrix * modelview) * vertex;
vec3 temp_precision; // Will be ignored.
vertex += double_add_vec3(model_origin, model_precision, scene_data.inv_view_matrix[3].xyz, view_precision, temp_precision);
vertex = mat3(scene_data.view_matrix) * vertex;
#else
vertex = (modelview * vec4(vertex, 1.0)).xyz;
#endif
#ifdef NORMAL_USED
normal = modelview_normal * normal;
#endif