New Object Picking example.

CMakeLists.txt

@@ -35,6 +35,7 @@ cmake_dependent_option(WITH_CUBEMAP "Build CubeMap example (requires JpegImporte
 cmake_dependent_option(WITH_FRAMEBUFFER "Build Framebuffer example (requires TgaImporter plugin)" OFF "NOT MAGNUM_TARGET_GLES" OFF)
 cmake_dependent_option(WITH_MOTIONBLUR "Build MotionBlur example" OFF "NOT MAGNUM_TARGET_GLES" OFF)
 option(WITH_OVR "Build OVR example" OFF)
+option(WITH_PICKING "Build Picking example" OFF)
 option(WITH_PRIMITIVES "Build Primitives example" OFF)
 option(WITH_TEXT "Build Text example (requires FreeTypeFont plugin)" OFF)
 cmake_dependent_option(WITH_TEXTUREDTRIANGLE "Build TexturedTriangle example (requires TgaImporter plugin)" OFF "NOT MAGNUM_TARGET_GLES" OFF)

doc/building-examples.dox

@@ -50,6 +50,7 @@ for more information.
     @ref Trade::TgaImporter "TgaImporter" plugin, not available in OpenGL ES.
 -   `WITH_MOTIONBLUR` -- Build Motion Blur example. Not available on OpenGL
     ES.
+-   `WITH_PICKING` -- Build Object Picking example.
 -   `WITH_PRIMITIVES` -- Build @ref examples-primitives "Primitives" example.
 -   `WITH_TEXT` -- Build Text example. Requires @ref Text::FreeTypeFont "FreeTypeFont"
     plugin.

package/archlinux/PKGBUILD

@@ -25,6 +25,7 @@ build() {
         -DWITH_FRAMEBUFFER=ON \
         -DWITH_MOTIONBLUR=ON \
         -DWITH_PRIMITIVES=ON \
+        -DWITH_PICKING=ON \
         -DWITH_TEXT=ON \
         -DWITH_TEXTUREDTRIANGLE=ON \
         -DWITH_TRIANGLE=ON \

package/archlinux/magnum-examples-git/PKGBUILD

@@ -30,6 +30,7 @@ build() {
         -DWITH_FRAMEBUFFER=ON \
         -DWITH_MOTIONBLUR=ON \
         -DWITH_PRIMITIVES=ON \
+        -DWITH_PICKING=ON \
         -DWITH_TEXT=ON \
         -DWITH_TEXTUREDTRIANGLE=ON \
         -DWITH_TRIANGLE=ON \

package/ci/jenkins-mingw-w64.xml

@@ -85,6 +85,7 @@ cmake .. \
     -DWITH_CUBEMAP=ON \
     -DWITH_FRAMEBUFFER=ON \
     -DWITH_MOTIONBLUR=ON \
+    -DWITH_PICKING=ON \
     -DWITH_PRIMITIVES=ON \
     -DWITH_TEXT=ON \
     -DWITH_TEXTUREDTRIANGLE=ON \

package/ci/jenkins.xml

@@ -109,6 +109,7 @@ cmake .. \
     -DWITH_CUBEMAP=${desktop_flag} \
     -DWITH_FRAMEBUFFER=${desktop_flag} \
     -DWITH_MOTIONBLUR=${desktop_flag} \
+    -DWITH_PICKING=ON \
     -DWITH_PRIMITIVES=ON \
     -DWITH_TEXT=${desktop_flag} \
     -DWITH_TEXTUREDTRIANGLE=${desktop_flag} \

package/debian/rules

@@ -9,6 +9,7 @@ override_dh_auto_configure:
 		-DWITH_CUBEMAP=ON \
 		-DWITH_FRAMEBUFFER=ON \
 		-DWITH_MOTIONBLUR=ON \
+		-DWITH_PICKING=ON \
 		-DWITH_PRIMITIVES=ON \
 		-DWITH_TEXT=ON \
 		-DWITH_TEXTUREDTRIANGLE=ON \

package/gentoo/dev-libs/magnum-examples/magnum-examples-9999.ebuild

@@ -33,6 +33,7 @@ src_configure() {
 		-DWITH_CUBEMAP=ON
 		-DWITH_FRAMEBUFFER=ON
 		-DWITH_MOTIONBLUR=ON
+		-DWITH_PICKING=ON
 		-DWITH_PRIMITIVES=ON
 		-DWITH_TEXT=ON
 		-DWITH_TEXTUREDTRIANGLE=ON

src/CMakeLists.txt

@@ -48,6 +48,10 @@ if(WITH_OVR)
     add_subdirectory(ovr)
 endif()
 
+if(WITH_PICKING)
+    add_subdirectory(picking)
+endif()
+
 if(WITH_PRIMITIVES)
     add_subdirectory(primitives)
 endif()

src/picking/CMakeLists.txt

@@ -0,0 +1,51 @@
+#
+#   This file is part of Magnum.
+#
+#   Copyright © 2010, 2011, 2012, 2013, 2014, 2015
+#             Vladimír Vondruš <[email protected]>
+#
+#   Permission is hereby granted, free of charge, to any person obtaining a
+#   copy of this software and associated documentation files (the "Software"),
+#   to deal in the Software without restriction, including without limitation
+#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+#   and/or sell copies of the Software, and to permit persons to whom the
+#   Software is furnished to do so, subject to the following conditions:
+#
+#   The above copyright notice and this permission notice shall be included
+#   in all copies or substantial portions of the Software.
+#
+#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+#   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+#   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+#   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+#   DEALINGS IN THE SOFTWARE.
+#
+
+cmake_minimum_required(VERSION 2.8.9)
+project(MagnumPickingExample)
+
+find_package(Magnum REQUIRED
+    MeshTools
+    Primitives
+    SceneGraph
+    Sdl2Application)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CORRADE_CXX_FLAGS}")
+include_directories(${MAGNUM_INCLUDE_DIRS} ${MAGNUM_APPLICATION_INCLUDE_DIRS})
+
+corrade_add_resource(PickingData resources.conf)
+
+add_executable(magnum-picking
+    PickingExample.cpp
+    ${PickingData})
+target_link_libraries(magnum-picking
+    ${MAGNUM_LIBRARIES}
+    ${MAGNUM_MESHTOOLS_LIBRARIES}
+    ${MAGNUM_PRIMITIVES_LIBRARIES}
+    ${MAGNUM_SCENEGRAPH_LIBRARIES}
+    ${MAGNUM_APPLICATION_LIBRARIES})
+
+install(TARGETS magnum-picking DESTINATION ${MAGNUM_BINARY_INSTALL_DIR})
+install(FILES README.md DESTINATION ${MAGNUM_DATA_INSTALL_DIR}/examples RENAME README-picking.md)

src/picking/PhongId.frag

@@ -0,0 +1,58 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015
+              Vladimír Vondruš <[email protected]>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+uniform lowp vec3 ambientColor;
+uniform lowp vec3 color;
+uniform lowp int objectId;
+
+in mediump vec3 transformedNormal;
+in highp vec3 lightDirection;
+in highp vec3 cameraDirection;
+
+layout(location = 0) out lowp vec4 fragmentColor;
+layout(location = 1) out lowp int fragmentObjectId;
+
+void main() {
+    mediump vec3 normalizedTransformedNormal = normalize(transformedNormal);
+    highp vec3 normalizedLightDirection = normalize(lightDirection);
+
+    /* Add ambient color */
+    fragmentColor.rgb = ambientColor;
+
+    /* Add diffuse color */
+    lowp float intensity = max(0.0, dot(normalizedTransformedNormal, normalizedLightDirection));
+    fragmentColor.rgb += color*intensity;
+
+    /* Add specular color, if needed */
+    if(intensity > 0.001) {
+        highp vec3 reflection = reflect(-normalizedLightDirection, normalizedTransformedNormal);
+        mediump float specularity = pow(max(0.0, dot(normalize(cameraDirection), reflection)), 80.0);
+        fragmentColor.rgb += vec3(1.0)*specularity;
+    }
+
+    /* Force alpha to 1 */
+    fragmentColor.a = 1.0;
+    fragmentObjectId = objectId;
+}

src/picking/PhongId.vert

@@ -0,0 +1,54 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015
+              Vladimír Vondruš <[email protected]>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+uniform highp mat4 transformationMatrix;
+uniform highp mat4 projectionMatrix;
+uniform mediump mat3 normalMatrix;
+uniform highp vec3 light;
+
+layout(location = 0) in highp vec4 position;
+layout(location = 1) in mediump vec3 normal;
+
+out mediump vec3 transformedNormal;
+out highp vec3 lightDirection;
+out highp vec3 cameraDirection;
+
+void main() {
+    /* Transformed vertex position */
+    highp vec4 transformedPosition4 = transformationMatrix*position;
+    highp vec3 transformedPosition = transformedPosition4.xyz/transformedPosition4.w;
+
+    /* Transformed normal vector */
+    transformedNormal = normalMatrix*normal;
+
+    /* Direction to the light */
+    lightDirection = normalize(light - transformedPosition);
+
+    /* Direction to the camera */
+    cameraDirection = -transformedPosition;
+
+    /* Transform the position */
+    gl_Position = projectionMatrix*transformedPosition4;
+}