From 4dc191b8da139b19c5aa5a705169647786516a20 Mon Sep 17 00:00:00 2001 From: Chris Loer Date: Tue, 20 Mar 2018 10:06:35 -0700 Subject: [core] Avoid flashing on pitched overzoomed tiles. Clamps perspective ratios in shaders. Fixes issue #11487. Port of GL JS PR #6365. --- src/mbgl/shaders/collision_box.cpp | 5 ++++- src/mbgl/shaders/symbol_icon.cpp | 5 ++++- src/mbgl/shaders/symbol_sdf.cpp | 5 ++++- 3 files changed, 12 insertions(+), 3 deletions(-) (limited to 'src/mbgl') diff --git a/src/mbgl/shaders/collision_box.cpp b/src/mbgl/shaders/collision_box.cpp index 9d11640bf4..bc5d9bc6f9 100644 --- a/src/mbgl/shaders/collision_box.cpp +++ b/src/mbgl/shaders/collision_box.cpp @@ -22,7 +22,10 @@ varying float v_notUsed; void main() { vec4 projectedPoint = u_matrix * vec4(a_anchor_pos, 0, 1); highp float camera_to_anchor_distance = projectedPoint.w; - highp float collision_perspective_ratio = 0.5 + 0.5 * (u_camera_to_center_distance / camera_to_anchor_distance); + highp float collision_perspective_ratio = clamp( + 0.5 + 0.5 * (u_camera_to_center_distance / camera_to_anchor_distance), + 0.0, // Prevents oversized near-field boxes in pitched/overzoomed tiles + 4.0); gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0); gl_Position.xy += a_extrude * u_extrude_scale * gl_Position.w * collision_perspective_ratio; diff --git a/src/mbgl/shaders/symbol_icon.cpp b/src/mbgl/shaders/symbol_icon.cpp index f5c2bbe22d..da31d36291 100644 --- a/src/mbgl/shaders/symbol_icon.cpp +++ b/src/mbgl/shaders/symbol_icon.cpp @@ -80,7 +80,10 @@ void main() { highp float distance_ratio = u_pitch_with_map ? camera_to_anchor_distance / u_camera_to_center_distance : u_camera_to_center_distance / camera_to_anchor_distance; - highp float perspective_ratio = 0.5 + 0.5 * distance_ratio; + highp float perspective_ratio = clamp( + 0.5 + 0.5 * distance_ratio, + 0.0, // Prevents oversized near-field symbols in pitched/overzoomed tiles + 4.0); size *= perspective_ratio; diff --git a/src/mbgl/shaders/symbol_sdf.cpp b/src/mbgl/shaders/symbol_sdf.cpp index 441eaf7aac..46bab10be5 100644 --- a/src/mbgl/shaders/symbol_sdf.cpp +++ b/src/mbgl/shaders/symbol_sdf.cpp @@ -156,7 +156,10 @@ void main() { highp float distance_ratio = u_pitch_with_map ? camera_to_anchor_distance / u_camera_to_center_distance : u_camera_to_center_distance / camera_to_anchor_distance; - highp float perspective_ratio = 0.5 + 0.5 * distance_ratio; + highp float perspective_ratio = clamp( + 0.5 + 0.5 * distance_ratio, + 0.0, // Prevents oversized near-field symbols in pitched/overzoomed tiles + 4.0); size *= perspective_ratio; -- cgit v1.2.1