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OSX specific: Fixed darker colors of objects inside multi-material gizmo on macOS running on Arm64 CPU.

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For Apple's on Arm CPU computed triangle normals inside fragment shader using dFdx and dFdy has the opposite direction. Because of this, objects had darker colors inside the multi-material gizmo.
Based on https://stackoverflow.com/a/66206648, the similar behavior was also spotted on some other devices with Arm CPU.
This commit is contained in:
Lukáš Hejl 2021-08-02 14:03:17 +02:00
parent ab9dfb7932
commit bad51cdb52
4 changed files with 61 additions and 4 deletions
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15
src/slic3r/GUI/GLShadersManager.cpp
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@ -1,4 +1,5 @@
#include "libslic3r/libslic3r.h"
#include "libslic3r/Platform.hpp"
#include "GLShadersManager.hpp"
#include "3DScene.hpp"
#include "GUI_App.hpp"
@ -43,9 +44,19 @@ std::pair<bool, std::string> GLShadersManager::init()
// used to render extrusion and travel paths as lines in gcode preview
valid &= append_shader("toolpaths_lines", { "toolpaths_lines.vs", "toolpaths_lines.fs" });
// used to render objects in 3d editor
valid &= append_shader("gouraud", { "gouraud.vs", "gouraud.fs" }
// For Apple's on Arm CPU computed triangle normals inside fragment shader using dFdx and dFdy has the opposite direction.
// Because of this, objects had darker colors inside the multi-material gizmo.
// Based on https://stackoverflow.com/a/66206648, the similar behavior was also spotted on some other devices with Arm CPU.
if (platform_flavor() == PlatformFlavor::OSXOnArm)
valid &= append_shader("gouraud", { "gouraud.vs", "gouraud.fs" }, { "FLIP_TRIANGLE_NORMALS"sv
#if ENABLE_ENVIRONMENT_MAP
, { "ENABLE_ENVIRONMENT_MAP"sv }
, "ENABLE_ENVIRONMENT_MAP"sv
#endif
});
else
valid &= append_shader("gouraud", { "gouraud.vs", "gouraud.fs" }
#if ENABLE_ENVIRONMENT_MAP
, { "ENABLE_ENVIRONMENT_MAP"sv }
#endif
);
// used to render variable layers heights in 3d editor