From 5285dcc986af6b62f732984afddce8e6717436c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 4 Sep 2020 20:10:29 +0200
Subject: [PATCH] Shaders: add a normal texture scale parameter to Phong.

It's needed to support the new material attributes supported by glTF.
The test output is slightly different as the normal coming from
the texture wasn't normalized before.
---
 doc/changelog.dox                             |   8 +++++
 src/Magnum/Shaders/Phong.cpp                  |  11 +++++++
 src/Magnum/Shaders/Phong.frag                 |  23 +++++++++----
 src/Magnum/Shaders/Phong.h                    |  31 ++++++++++++++----
 src/Magnum/Shaders/Phong.vert                 |   4 +--
 src/Magnum/Shaders/Test/CMakeLists.txt        |   2 ++
 src/Magnum/Shaders/Test/PhongGLTest.cpp       |  25 ++++++++++----
 .../Test/PhongTestFiles/instanced-normal.tga  | Bin 9469 -> 9875 bytes
 .../Test/PhongTestFiles/textured-normal.tga   | Bin 11108 -> 11108 bytes
 .../PhongTestFiles/textured-normal0.0.tga     | Bin 0 -> 3070 bytes
 .../PhongTestFiles/textured-normal0.5.tga     | Bin 0 -> 10855 bytes
 11 files changed, 83 insertions(+), 21 deletions(-)
 create mode 100644 src/Magnum/Shaders/Test/PhongTestFiles/textured-normal0.0.tga
 create mode 100644 src/Magnum/Shaders/Test/PhongTestFiles/textured-normal0.5.tga

diff --git a/doc/changelog.dox b/doc/changelog.dox
index 39eef6aa9..bc33ca812 100644
--- a/doc/changelog.dox
+++ b/doc/changelog.dox
@@ -73,6 +73,11 @@ See also:
 -   Added @ref MeshTools::generateQuadIndices() for quad triangulation
     including non-convex and non-planar quads
 
+@subsubsection changelog-latest-new-shaders Shaders library
+
+-   Added @ref Shaders::Phong::setNormalTextureScale(), consuming the recently
+    added @ref Trade::MaterialAttribute::NormalTextureScale material attribute
+
 @subsubsection changelog-latest-new-scenegraph SceneGraph library
 
 -   Added @ref SceneGraph::Object::move()
@@ -148,6 +153,9 @@ See also:
 -   @ref Shaders::Phong was normalizing light direction in vertex shader,
     causing the fragment-interpolated direction being incorrect with visible
     artifacts on long polygons under low light angle
+-   @ref Shaders::Phong wasn't normalizing normals coming from normal textures,
+    which may have caused slight artifacts due to limited precision of 8-bit
+    pixel formats
 
 @subsection changelog-latest-deprecated Deprecated APIs
 
diff --git a/src/Magnum/Shaders/Phong.cpp b/src/Magnum/Shaders/Phong.cpp
index dfdd6f915..18a10f990 100644
--- a/src/Magnum/Shaders/Phong.cpp
+++ b/src/Magnum/Shaders/Phong.cpp
@@ -178,6 +178,8 @@ Phong::Phong(const Flags flags, const UnsignedInt lightCount): _flags{flags}, _l
             _diffuseColorUniform = uniformLocation("diffuseColor");
             _specularColorUniform = uniformLocation("specularColor");
             _shininessUniform = uniformLocation("shininess");
+            if(flags & Flag::NormalTexture)
+                _normalTextureScaleUniform = uniformLocation("normalTextureScale");
             _lightPositionsUniform = uniformLocation("lightPositions");
             _lightColorsUniform = uniformLocation("lightColors");
         }
@@ -210,6 +212,8 @@ Phong::Phong(const Flags flags, const UnsignedInt lightCount): _flags{flags}, _l
         setDiffuseColor(Magnum::Color4{1.0f});
         setSpecularColor(Magnum::Color4{1.0f, 0.0f});
         setShininess(80.0f);
+        if(flags & Flag::NormalTexture)
+            setNormalTextureScale(1.0f);
         setLightColors(Containers::Array<Magnum::Color4>{Containers::DirectInit, lightCount, Magnum::Color4{1.0f}});
         /* Light position is zero by default */
         setNormalMatrix({});
@@ -275,6 +279,13 @@ Phong& Phong::setShininess(Float shininess) {
     return *this;
 }
 
+Phong& Phong::setNormalTextureScale(const Float scale) {
+    CORRADE_ASSERT(_flags & Flag::NormalTexture,
+        "Shaders::Phong::setNormalTextureScale(): the shader was not created with normal texture enabled", *this);
+    if(_lightCount) setUniform(_normalTextureScaleUniform, scale);
+    return *this;
+}
+
 Phong& Phong::setAlphaMask(Float mask) {
     CORRADE_ASSERT(_flags & Flag::AlphaMask,
         "Shaders::Phong::setAlphaMask(): the shader was not created with alpha mask enabled", *this);
diff --git a/src/Magnum/Shaders/Phong.frag b/src/Magnum/Shaders/Phong.frag
index 43a05e571..05e284e69 100644
--- a/src/Magnum/Shaders/Phong.frag
+++ b/src/Magnum/Shaders/Phong.frag
@@ -107,10 +107,21 @@ uniform mediump float shininess
     ;
 #endif
 
-#ifdef ALPHA_MASK
+#ifdef NORMAL_TEXTURE
 #ifdef EXPLICIT_UNIFORM_LOCATION
 layout(location = 8)
 #endif
+uniform mediump float normalTextureScale
+    #ifndef GL_ES
+    = 1.0
+    #endif
+    ;
+#endif
+
+#ifdef ALPHA_MASK
+#ifdef EXPLICIT_UNIFORM_LOCATION
+layout(location = 9)
+#endif
 uniform lowp float alphaMask
     #ifndef GL_ES
     = 0.5
@@ -120,16 +131,16 @@ uniform lowp float alphaMask
 
 #ifdef OBJECT_ID
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 9)
+layout(location = 10)
 #endif
 /* mediump is just 2^10, which might not be enough, this is 2^16 */
 uniform highp uint objectId; /* defaults to zero */
 #endif
 
 #if LIGHT_COUNT
-/* Needs to be last because it uses locations 10 + LIGHT_COUNT to
-   10 + 2*LIGHT_COUNT - 1. Location 10 is lightPositions. Also it can't be
-   specified as 10 + LIGHT_COUNT because that requires ARB_enhanced_layouts. */
+/* Needs to be last because it uses locations 11 + LIGHT_COUNT to
+   11 + 2*LIGHT_COUNT - 1. Location 11 is lightPositions. Also it can't be
+   specified as 11 + LIGHT_COUNT because that requires ARB_enhanced_layouts. */
 #ifdef EXPLICIT_UNIFORM_LOCATION
 layout(location = LIGHT_COLORS_LOCATION) /* I fear this will blow up some drivers */
 #endif
@@ -214,7 +225,7 @@ void main() {
                         normalizedTransformedTangent)),
         normalizedTransformedNormal
     );
-    normalizedTransformedNormal = tbn*(texture(normalTexture, interpolatedTextureCoordinates).rgb*2.0 - vec3(1.0));
+    normalizedTransformedNormal = tbn*(normalize((texture(normalTexture, interpolatedTextureCoordinates).rgb*2.0 - vec3(1.0))*vec3(normalTextureScale, normalTextureScale, 1.0)));
     #endif
 
     /* Add diffuse color for each light */
diff --git a/src/Magnum/Shaders/Phong.h b/src/Magnum/Shaders/Phong.h
index fcd5b5557..6e03e6143 100644
--- a/src/Magnum/Shaders/Phong.h
+++ b/src/Magnum/Shaders/Phong.h
@@ -513,6 +513,24 @@ class MAGNUM_SHADERS_EXPORT Phong: public GL::AbstractShaderProgram {
          */
         Phong& bindDiffuseTexture(GL::Texture2D& texture);
 
+        /**
+         * @brief Set normal texture scale
+         * @return Reference to self (for method chaining)
+         * @m_since_latest
+         *
+         * Affects strength of the normal mapping. Initial value is
+         * @cpp 1.0f @ce, meaning the normal texture is not changed in any way;
+         * a value of @cpp 0.0f @ce disables the normal texture effect
+         * altogether.
+         *
+         * Expects that the shader was created with @ref Flag::NormalTexture
+         * enabled. If @ref lightCount() is zero, this function is a no-op, as
+         * normals don't contribute to the output in that case.
+         * @see @ref bindNormalTexture(),
+         *      @ref Trade::MaterialAttribute::NormalTextureScale
+         */
+        Phong& setNormalTextureScale(Float scale);
+
         /**
          * @brief Bind a normal texture
          * @return Reference to self (for method chaining)
@@ -521,8 +539,8 @@ class MAGNUM_SHADERS_EXPORT Phong: public GL::AbstractShaderProgram {
          * Expects that the shader was created with @ref Flag::NormalTexture
          * enabled and the @ref Tangent attribute was supplied. If
          * @ref lightCount() is zero, this function is a no-op, as normals
-         * dosn't contribute to the output in that case.
-         * @see @ref bindTextures()
+         * don't contribute to the output in that case.
+         * @see @ref bindTextures(), @ref setNormalTextureScale()
          */
         Phong& bindNormalTexture(GL::Texture2D& texture);
 
@@ -743,12 +761,13 @@ class MAGNUM_SHADERS_EXPORT Phong: public GL::AbstractShaderProgram {
             _diffuseColorUniform{5},
             _specularColorUniform{6},
             _shininessUniform{7},
-            _alphaMaskUniform{8};
+            _normalTextureScaleUniform{8},
+            _alphaMaskUniform{9};
             #ifndef MAGNUM_TARGET_GLES2
-            Int _objectIdUniform{9};
+            Int _objectIdUniform{10};
             #endif
-        Int _lightPositionsUniform{10},
-            _lightColorsUniform; /* 10 + lightCount, set in the constructor */
+        Int _lightPositionsUniform{11},
+            _lightColorsUniform; /* 11 + lightCount, set in the constructor */
 };
 
 /** @debugoperatorclassenum{Phong,Phong::Flag} */
diff --git a/src/Magnum/Shaders/Phong.vert b/src/Magnum/Shaders/Phong.vert
index c89ee394a..981063770 100644
--- a/src/Magnum/Shaders/Phong.vert
+++ b/src/Magnum/Shaders/Phong.vert
@@ -73,9 +73,9 @@ uniform mediump mat3 textureMatrix
 #endif
 
 #if LIGHT_COUNT
-/* Needs to be last because it uses locations 10 to 10 + LIGHT_COUNT - 1 */
+/* Needs to be last because it uses locations 11 to 11 + LIGHT_COUNT - 1 */
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 10)
+layout(location = 11)
 #endif
 uniform highp vec3 lightPositions[LIGHT_COUNT]; /* defaults to zero */
 #endif
diff --git a/src/Magnum/Shaders/Test/CMakeLists.txt b/src/Magnum/Shaders/Test/CMakeLists.txt
index 805405e70..83cd3f7e7 100644
--- a/src/Magnum/Shaders/Test/CMakeLists.txt
+++ b/src/Magnum/Shaders/Test/CMakeLists.txt
@@ -234,6 +234,8 @@ if(BUILD_GL_TESTS)
             PhongTestFiles/textured-diffuse.tga
             PhongTestFiles/textured-diffuse-transformed.tga
             PhongTestFiles/textured-normal.tga
+            PhongTestFiles/textured-normal0.0.tga
+            PhongTestFiles/textured-normal0.5.tga
             PhongTestFiles/textured-specular.tga
             PhongTestFiles/textured.tga
             PhongTestFiles/vertexColor.tga
diff --git a/src/Magnum/Shaders/Test/PhongGLTest.cpp b/src/Magnum/Shaders/Test/PhongGLTest.cpp
index 50ce4718f..0e301e6ad 100644
--- a/src/Magnum/Shaders/Test/PhongGLTest.cpp
+++ b/src/Magnum/Shaders/Test/PhongGLTest.cpp
@@ -206,13 +206,17 @@ const struct {
 /* MSVC 2015 doesn't like constexpr here due to the angles */
 const struct {
     const char* name;
+    const char* expected;
     bool multiBind;
     Deg rotation;
+    Float scale;
 } RenderTexturedNormalData[]{
-    {"", false, {}},
-    {"multi bind", true, {}},
-    {"rotated 90°", false, 90.0_degf},
-    {"rotated -90°", false, -90.0_degf}
+    {"", "textured-normal.tga", false, {}, 1.0f},
+    {"multi bind", "textured-normal.tga", true, {}, 1.0f},
+    {"rotated 90°", "textured-normal.tga", false, 90.0_degf, 1.0f},
+    {"rotated -90°", "textured-normal.tga", false, -90.0_degf, 1.0f},
+    {"0.5 scale", "textured-normal0.5.tga", false, {}, 0.5f},
+    {"0.0 scale", "textured-normal0.0.tga", false, {}, 0.0f}
 };
 
 const struct {
@@ -490,6 +494,7 @@ void PhongGLTest::bindTexturesNotEnabled() {
           .bindDiffuseTexture(texture)
           .bindSpecularTexture(texture)
           .bindNormalTexture(texture)
+          .setNormalTextureScale(0.5f)
           .bindTextures(&texture, &texture, &texture, &texture);
 
     CORRADE_COMPARE(out.str(),
@@ -497,6 +502,7 @@ void PhongGLTest::bindTexturesNotEnabled() {
         "Shaders::Phong::bindDiffuseTexture(): the shader was not created with diffuse texture enabled\n"
         "Shaders::Phong::bindSpecularTexture(): the shader was not created with specular texture enabled\n"
         "Shaders::Phong::bindNormalTexture(): the shader was not created with normal texture enabled\n"
+        "Shaders::Phong::setNormalTextureScale(): the shader was not created with normal texture enabled\n"
         "Shaders::Phong::bindTextures(): the shader was not created with any textures enabled\n");
 }
 
@@ -931,6 +937,10 @@ void PhongGLTest::renderTexturedNormal() {
         .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
         .setDiffuseColor(0x999999_rgbf);
 
+    /* Verify the default is working properly */
+    if(data.scale != 1.0f)
+        shader.setNormalTextureScale(data.scale);
+
     if(data.multiBind)
         shader.bindTextures(nullptr, nullptr, nullptr, &normal);
     else
@@ -965,7 +975,7 @@ void PhongGLTest::renderTexturedNormal() {
     const Float maxThreshold = 191.0f, meanThreshold = 3.017f;
     #endif
     CORRADE_COMPARE_WITH(pixels,
-        Utility::Directory::join(_testDir, "PhongTestFiles/textured-normal.tga"),
+        Utility::Directory::join({_testDir, "PhongTestFiles", data.expected}),
         (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
 }
 
@@ -1377,7 +1387,7 @@ void PhongGLTest::renderZeroLights() {
         Primitives::UVSphereFlag::TextureCoordinates));
 
     /* Enable also Object ID, if supported */
-    Phong::Flags flags = Phong::Flag::AmbientTexture|Phong::Flag::AlphaMask;
+    Phong::Flags flags = Phong::Flag::AmbientTexture|Phong::Flag::NormalTexture|Phong::Flag::AlphaMask;
     #ifndef MAGNUM_TARGET_GLES2
     #ifndef MAGNUM_TARGET_GLES
     if(GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
@@ -1419,7 +1429,8 @@ void PhongGLTest::renderZeroLights() {
         .setNormalMatrix(Matrix3x3{Math::ZeroInit})
         .setDiffuseColor(0xfa9922_rgbf)
         .setSpecularColor(0xfa9922_rgbf)
-        .setShininess(0.2f);
+        .setShininess(0.2f)
+        .setNormalTextureScale(-0.3f);
 
     #ifndef MAGNUM_TARGET_GLES2
     #ifndef MAGNUM_TARGET_GLES
diff --git a/src/Magnum/Shaders/Test/PhongTestFiles/instanced-normal.tga b/src/Magnum/Shaders/Test/PhongTestFiles/instanced-normal.tga
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