Use no lod bump map shaders always

The bump map shader used Lod functions even though mipmapping is not
enabled. Use no lod version instead. Texture size was also 1x1 always,
so the size had to be fetched with Q3DSImageManager.

Task-number: QT3DS-2284
Change-Id: I5c49911dc13738797428491f107b4fedd37535c1
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 52 insertions, 0 deletions

diff --git a/res/effectlib/defaultMaterialBumpNoLod.glsllib b/res/effectlib/defaultMaterialBumpNoLod.glsllib
new file mode 100644
index 0000000..2f3bd15
--- /dev/null
+++ b/res/effectlib/defaultMaterialBumpNoLod.glsllib
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+float calcRGBAvg(in vec4 rgba)
+{
+    return (rgba.r + rgba.g + rgba.b) / 3.0;
+}
+
+vec3 defaultMaterialBumpNoLod(in sampler2D sampler, in float factor,
+                              in vec2 texCoord, in vec3 tangent, in vec3 binormal,
+                              in vec3 normal, in vec2 bumpSize )
+{
+    // invert factor
+    float invFactor = -factor;
+
+    vec2 unitStep = 1.0 / bumpSize;
+
+    float du = calcRGBAvg(texture2D( sampler, vec2( texCoord.x + unitStep.x, texCoord.y )))
+             - calcRGBAvg(texture2D( sampler, vec2( texCoord.x, texCoord.y )));
+    float dv = calcRGBAvg(texture2D( sampler, vec2( texCoord.x, texCoord.y + unitStep.y )))
+             - calcRGBAvg(texture2D( sampler, vec2( texCoord.x, texCoord.y )));
+
+    vec3 n = normalize(vec3(invFactor * du, invFactor * dv, 1.0));
+    n = n.x * normalize(tangent) + n.y * normalize(binormal) + n.z * normal;
+    return normalize(normal + n);
+}