Added support for geometry shaders

include/SFML/Graphics/Shader.hpp

@@ -46,7 +46,7 @@ class Texture;
 class Transform;
 
 ////////////////////////////////////////////////////////////
-/// \brief Shader class (vertex and fragment)
+/// \brief Shader class (vertex, geometry and fragment)
 ///
 ////////////////////////////////////////////////////////////
 class SFML_GRAPHICS_API Shader : GlResource, NonCopyable
@@ -59,8 +59,9 @@ public:
     ////////////////////////////////////////////////////////////
     enum Type
     {
-        Vertex,  ///< %Vertex shader
+        Vertex,   ///< %Vertex shader
-        Fragment ///< Fragment (pixel) shader
+        Geometry, ///< Geometry shader
+        Fragment  ///< Fragment (pixel) shader
     };
 
     ////////////////////////////////////////////////////////////
@@ -97,9 +98,9 @@ public:
     ~Shader();
 
     ////////////////////////////////////////////////////////////
-    /// \brief Load either the vertex or fragment shader from a file
+    /// \brief Load the vertex, geometry or fragment shader from a file
     ///
-    /// This function loads a single shader, either vertex or
+    /// This function loads a single shader, vertex, geometry or
     /// fragment, identified by the second argument.
     /// The source must be a text file containing a valid
     /// shader in GLSL language. GLSL is a C-like language
@@ -107,8 +108,8 @@ public:
     /// read a good documentation for it before writing your
     /// own shaders.
     ///
-    /// \param filename Path of the vertex or fragment shader file to load
+    /// \param filename Path of the vertex, geometry or fragment shader file to load
-    /// \param type     Type of shader (vertex or fragment)
+    /// \param type     Type of shader (vertex, geometry or fragment)
     ///
     /// \return True if loading succeeded, false if it failed
     ///
@@ -139,17 +140,39 @@ public:
     bool loadFromFile(const std::string& vertexShaderFilename, const std::string& fragmentShaderFilename);
 
     ////////////////////////////////////////////////////////////
-    /// \brief Load either the vertex or fragment shader from a source code in memory
+    /// \brief Load the vertex, geometry and fragment shaders from files
     ///
-    /// This function loads a single shader, either vertex or
+    /// This function loads the vertex, geometry and fragment
-    /// fragment, identified by the second argument.
+    /// shaders. If one of them fails to load, the shader is left
+    /// empty (the valid shader is unloaded).
+    /// The sources must be text files containing valid shaders
+    /// in GLSL language. GLSL is a C-like language dedicated to
+    /// OpenGL shaders; you'll probably need to read a good documentation
+    /// for it before writing your own shaders.
+    ///
+    /// \param vertexShaderFilename   Path of the vertex shader file to load
+    /// \param geometryShaderFilename Path of the geometry shader file to load
+    /// \param fragmentShaderFilename Path of the fragment shader file to load
+    ///
+    /// \return True if loading succeeded, false if it failed
+    ///
+    /// \see loadFromMemory, loadFromStream
+    ///
+    ////////////////////////////////////////////////////////////
+    bool loadFromFile(const std::string& vertexShaderFilename, const std::string& geometryShaderFilename, const std::string& fragmentShaderFilename);
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Load the vertex, geometry or fragment shader from a source code in memory
+    ///
+    /// This function loads a single shader, vertex, geometry
+    /// or fragment, identified by the second argument.
     /// The source code must be a valid shader in GLSL language.
     /// GLSL is a C-like language dedicated to OpenGL shaders;
     /// you'll probably need to read a good documentation for
     /// it before writing your own shaders.
     ///
     /// \param shader String containing the source code of the shader
-    /// \param type   Type of shader (vertex or fragment)
+    /// \param type   Type of shader (vertex, geometry or fragment)
     ///
     /// \return True if loading succeeded, false if it failed
     ///
@@ -180,17 +203,39 @@ public:
     bool loadFromMemory(const std::string& vertexShader, const std::string& fragmentShader);
 
     ////////////////////////////////////////////////////////////
-    /// \brief Load either the vertex or fragment shader from a custom stream
+    /// \brief Load the vertex, geometry and fragment shaders from source codes in memory
     ///
-    /// This function loads a single shader, either vertex or
+    /// This function loads the vertex, geometry and fragment
-    /// fragment, identified by the second argument.
+    /// shaders. If one of them fails to load, the shader is left
+    /// empty (the valid shader is unloaded).
+    /// The sources must be valid shaders in GLSL language. GLSL is
+    /// a C-like language dedicated to OpenGL shaders; you'll
+    /// probably need to read a good documentation for it before
+    /// writing your own shaders.
+    ///
+    /// \param vertexShader   String containing the source code of the vertex shader
+    /// \param geometryShader String containing the source code of the geometry shader
+    /// \param fragmentShader String containing the source code of the fragment shader
+    ///
+    /// \return True if loading succeeded, false if it failed
+    ///
+    /// \see loadFromFile, loadFromStream
+    ///
+    ////////////////////////////////////////////////////////////
+    bool loadFromMemory(const std::string& vertexShader, const std::string& geometryShader, const std::string& fragmentShader);
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Load the vertex, geometry or fragment shader from a custom stream
+    ///
+    /// This function loads a single shader, vertex, geometry
+    /// or fragment, identified by the second argument.
     /// The source code must be a valid shader in GLSL language.
     /// GLSL is a C-like language dedicated to OpenGL shaders;
     /// you'll probably need to read a good documentation for it
     /// before writing your own shaders.
     ///
     /// \param stream Source stream to read from
-    /// \param type   Type of shader (vertex or fragment)
+    /// \param type   Type of shader (vertex, geometry or fragment)
     ///
     /// \return True if loading succeeded, false if it failed
     ///
@@ -220,6 +265,28 @@ public:
     ////////////////////////////////////////////////////////////
     bool loadFromStream(InputStream& vertexShaderStream, InputStream& fragmentShaderStream);
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Load the vertex, geometry and fragment shaders from custom streams
+    ///
+    /// This function loads the vertex, geometry and fragment
+    /// shaders. If one of them fails to load, the shader is left
+    /// empty (the valid shader is unloaded).
+    /// The source codes must be valid shaders in GLSL language.
+    /// GLSL is a C-like language dedicated to OpenGL shaders;
+    /// you'll probably need to read a good documentation for
+    /// it before writing your own shaders.
+    ///
+    /// \param vertexShaderStream   Source stream to read the vertex shader from
+    /// \param geometryShaderStream Source stream to read the geometry shader from
+    /// \param fragmentShaderStream Source stream to read the fragment shader from
+    ///
+    /// \return True if loading succeeded, false if it failed
+    ///
+    /// \see loadFromFile, loadFromMemory
+    ///
+    ////////////////////////////////////////////////////////////
+    bool loadFromStream(InputStream& vertexShaderStream, InputStream& geometryShaderStream, InputStream& fragmentShaderStream);
+
     ////////////////////////////////////////////////////////////
     /// \brief Specify value for \p float uniform
     ///
@@ -605,6 +672,25 @@ public:
     ////////////////////////////////////////////////////////////
     static bool isAvailable();
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Tell whether or not the system supports geometry shaders
+    ///
+    /// This function should always be called before using
+    /// the geometry shader features. If it returns false, then
+    /// any attempt to use sf::Shader geometry shader features will fail.
+    ///
+    /// This function can only return true if isAvailable() would also
+    /// return true, since shaders in general have to be supported in
+    /// order for geometry shaders to be supported as well.
+    ///
+    /// Note: The first call to this function, whether by your
+    /// code or SFML will result in a context switch.
+    ///
+    /// \return True if geometry shaders are supported, false otherwise
+    ///
+    ////////////////////////////////////////////////////////////
+    static bool isGeometryAvailable();
+
 private:
 
     ////////////////////////////////////////////////////////////
@@ -614,12 +700,13 @@ private:
     /// is not created.
     ///
     /// \param vertexShaderCode   Source code of the vertex shader
+    /// \param geometryShaderCode Source code of the geometry shader
     /// \param fragmentShaderCode Source code of the fragment shader
     ///
     /// \return True on success, false if any error happened
     ///
     ////////////////////////////////////////////////////////////
-    bool compile(const char* vertexShaderCode, const char* fragmentShaderCode);
+    bool compile(const char* vertexShaderCode, const char* geometryShaderCode, const char* fragmentShaderCode);
 
     ////////////////////////////////////////////////////////////
     /// \brief Bind all the textures used by the shader
@@ -678,13 +765,15 @@ private:
 /// executed directly by the graphics card and allowing
 /// to apply real-time operations to the rendered entities.
 ///
-/// There are two kinds of shaders:
+/// There are three kinds of shaders:
 /// \li %Vertex shaders, that process vertices
+/// \li Geometry shaders, that process primitives
 /// \li Fragment (pixel) shaders, that process pixels
 ///
 /// A sf::Shader can be composed of either a vertex shader
-/// alone, a fragment shader alone, or both combined
+/// alone, a geometry shader alone, a fragment shader alone,
-/// (see the variants of the load functions).
+/// or any combination of them. (see the variants of the
+/// load functions).
 ///
 /// Shaders are written in GLSL, which is a C-like
 /// language dedicated to OpenGL shaders. You'll probably

src/SFML/Graphics/GLExtensions.hpp

@@ -228,6 +228,10 @@
     #define GLEXT_GL_FRAMEBUFFER_BINDING              GL_FRAMEBUFFER_BINDING_EXT
     #define GLEXT_GL_INVALID_FRAMEBUFFER_OPERATION    GL_INVALID_FRAMEBUFFER_OPERATION_EXT
 
+    // Core since 3.2 - ARB_geometry_shader4
+    #define GLEXT_geometry_shader4                    sfogl_ext_ARB_geometry_shader4
+    #define GLEXT_GL_GEOMETRY_SHADER                  GL_GEOMETRY_SHADER_ARB
+
 #endif
 
 namespace sf

src/SFML/Graphics/GLExtensions.txt

@@ -14,3 +14,4 @@ ARB_fragment_shader
 ARB_texture_non_power_of_two
 EXT_blend_equation_separate
 EXT_framebuffer_object
+ARB_geometry_shader4

src/SFML/Graphics/GLLoader.cpp

@@ -46,6 +46,7 @@ int sfogl_ext_ARB_fragment_shader = sfogl_LOAD_FAILED;
 int sfogl_ext_ARB_texture_non_power_of_two = sfogl_LOAD_FAILED;
 int sfogl_ext_EXT_blend_equation_separate = sfogl_LOAD_FAILED;
 int sfogl_ext_EXT_framebuffer_object = sfogl_LOAD_FAILED;
+int sfogl_ext_ARB_geometry_shader4 = sfogl_LOAD_FAILED;
 
 void (GL_FUNCPTR *sf_ptrc_glBlendEquationEXT)(GLenum) = NULL;
 
@@ -798,6 +799,34 @@ static int Load_EXT_framebuffer_object()
     return numFailed;
 }
 
+void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureARB)(GLenum, GLenum, GLuint, GLint) = NULL;
+void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureFaceARB)(GLenum, GLenum, GLuint, GLint, GLenum) = NULL;
+void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureLayerARB)(GLenum, GLenum, GLuint, GLint, GLint) = NULL;
+void (GL_FUNCPTR *sf_ptrc_glProgramParameteriARB)(GLuint, GLenum, GLint) = NULL;
+
+static int Load_ARB_geometry_shader4()
+{
+    int numFailed = 0;
+
+    sf_ptrc_glFramebufferTextureARB = reinterpret_cast<void (GL_FUNCPTR *)(GLenum, GLenum, GLuint, GLint)>(glLoaderGetProcAddress("glFramebufferTextureARB"));
+    if (!sf_ptrc_glFramebufferTextureARB)
+        numFailed++;
+
+    sf_ptrc_glFramebufferTextureFaceARB = reinterpret_cast<void (GL_FUNCPTR *)(GLenum, GLenum, GLuint, GLint, GLenum)>(glLoaderGetProcAddress("glFramebufferTextureFaceARB"));
+    if (!sf_ptrc_glFramebufferTextureFaceARB)
+        numFailed++;
+
+    sf_ptrc_glFramebufferTextureLayerARB = reinterpret_cast<void (GL_FUNCPTR *)(GLenum, GLenum, GLuint, GLint, GLint)>(glLoaderGetProcAddress("glFramebufferTextureLayerARB"));
+    if (!sf_ptrc_glFramebufferTextureLayerARB)
+        numFailed++;
+
+    sf_ptrc_glProgramParameteriARB = reinterpret_cast<void (GL_FUNCPTR *)(GLuint, GLenum, GLint)>(glLoaderGetProcAddress("glProgramParameteriARB"));
+    if (!sf_ptrc_glProgramParameteriARB)
+        numFailed++;
+
+    return numFailed;
+}
+
 typedef int (*PFN_LOADFUNCPOINTERS)();
 typedef struct sfogl_StrToExtMap_s
 {
@@ -806,7 +835,7 @@ typedef struct sfogl_StrToExtMap_s
     PFN_LOADFUNCPOINTERS LoadExtension;
 } sfogl_StrToExtMap;
 
-static sfogl_StrToExtMap ExtensionMap[13] = {
+static sfogl_StrToExtMap ExtensionMap[14] = {
     {"GL_SGIS_texture_edge_clamp", &sfogl_ext_SGIS_texture_edge_clamp, NULL},
     {"GL_EXT_texture_edge_clamp", &sfogl_ext_EXT_texture_edge_clamp, NULL},
     {"GL_EXT_blend_minmax", &sfogl_ext_EXT_blend_minmax, Load_EXT_blend_minmax},
@@ -819,10 +848,11 @@ static sfogl_StrToExtMap ExtensionMap[13] = {
     {"GL_ARB_fragment_shader", &sfogl_ext_ARB_fragment_shader, NULL},
     {"GL_ARB_texture_non_power_of_two", &sfogl_ext_ARB_texture_non_power_of_two, NULL},
     {"GL_EXT_blend_equation_separate", &sfogl_ext_EXT_blend_equation_separate, Load_EXT_blend_equation_separate},
-    {"GL_EXT_framebuffer_object", &sfogl_ext_EXT_framebuffer_object, Load_EXT_framebuffer_object}
+    {"GL_EXT_framebuffer_object", &sfogl_ext_EXT_framebuffer_object, Load_EXT_framebuffer_object},
+    {"GL_ARB_geometry_shader4", &sfogl_ext_ARB_geometry_shader4, Load_ARB_geometry_shader4}
 };
 
-static int g_extensionMapSize = 13;
+static int g_extensionMapSize = 14;
 
 
 static void ClearExtensionVars()
@@ -840,6 +870,7 @@ static void ClearExtensionVars()
     sfogl_ext_ARB_texture_non_power_of_two = sfogl_LOAD_FAILED;
     sfogl_ext_EXT_blend_equation_separate = sfogl_LOAD_FAILED;
     sfogl_ext_EXT_framebuffer_object = sfogl_LOAD_FAILED;
+    sfogl_ext_ARB_geometry_shader4 = sfogl_LOAD_FAILED;
 }
 
 

src/SFML/Graphics/GLLoader.hpp

@@ -183,6 +183,7 @@ extern int sfogl_ext_ARB_fragment_shader;
 extern int sfogl_ext_ARB_texture_non_power_of_two;
 extern int sfogl_ext_EXT_blend_equation_separate;
 extern int sfogl_ext_EXT_framebuffer_object;
+extern int sfogl_ext_ARB_geometry_shader4;
 
 #define GL_CLAMP_TO_EDGE_SGIS 0x812F
 
@@ -360,6 +361,27 @@ extern int sfogl_ext_EXT_framebuffer_object;
 #define GL_STENCIL_INDEX4_EXT 0x8D47
 #define GL_STENCIL_INDEX8_EXT 0x8D48
 
+#define GL_FRAMEBUFFER_ATTACHMENT_LAYERED_ARB 0x8DA7
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER 0x8CD4
+#define GL_FRAMEBUFFER_INCOMPLETE_LAYER_COUNT_ARB 0x8DA9
+#define GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_ARB 0x8DA8
+#define GL_GEOMETRY_INPUT_TYPE_ARB 0x8DDB
+#define GL_GEOMETRY_OUTPUT_TYPE_ARB 0x8DDC
+#define GL_GEOMETRY_SHADER_ARB 0x8DD9
+#define GL_GEOMETRY_VERTICES_OUT_ARB 0x8DDA
+#define GL_LINES_ADJACENCY_ARB 0x000A
+#define GL_LINE_STRIP_ADJACENCY_ARB 0x000B
+#define GL_MAX_GEOMETRY_OUTPUT_VERTICES_ARB 0x8DE0
+#define GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_ARB 0x8C29
+#define GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_ARB 0x8DE1
+#define GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_ARB 0x8DDF
+#define GL_MAX_GEOMETRY_VARYING_COMPONENTS_ARB 0x8DDD
+#define GL_MAX_VARYING_COMPONENTS 0x8B4B
+#define GL_MAX_VERTEX_VARYING_COMPONENTS_ARB 0x8DDE
+#define GL_PROGRAM_POINT_SIZE_ARB 0x8642
+#define GL_TRIANGLES_ADJACENCY_ARB 0x000C
+#define GL_TRIANGLE_STRIP_ADJACENCY_ARB 0x000D
+
 #define GL_2D 0x0600
 #define GL_2_BYTES 0x1407
 #define GL_3D 0x0601
@@ -1201,6 +1223,18 @@ extern void (GL_FUNCPTR *sf_ptrc_glRenderbufferStorageEXT)(GLenum, GLenum, GLsiz
 #define glRenderbufferStorageEXT sf_ptrc_glRenderbufferStorageEXT
 #endif // GL_EXT_framebuffer_object
 
+#ifndef GL_ARB_geometry_shader4
+#define GL_ARB_geometry_shader4 1
+extern void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureARB)(GLenum, GLenum, GLuint, GLint);
+#define glFramebufferTextureARB sf_ptrc_glFramebufferTextureARB
+extern void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureFaceARB)(GLenum, GLenum, GLuint, GLint, GLenum);
+#define glFramebufferTextureFaceARB sf_ptrc_glFramebufferTextureFaceARB
+extern void (GL_FUNCPTR *sf_ptrc_glFramebufferTextureLayerARB)(GLenum, GLenum, GLuint, GLint, GLint);
+#define glFramebufferTextureLayerARB sf_ptrc_glFramebufferTextureLayerARB
+extern void (GL_FUNCPTR *sf_ptrc_glProgramParameteriARB)(GLuint, GLenum, GLint);
+#define glProgramParameteriARB sf_ptrc_glProgramParameteriARB
+#endif // GL_ARB_geometry_shader4
+
 GLAPI void APIENTRY glAccum(GLenum, GLfloat);
 GLAPI void APIENTRY glAlphaFunc(GLenum, GLfloat);
 GLAPI void APIENTRY glBegin(GLenum);

src/SFML/Graphics/Shader.cpp

@@ -148,6 +148,20 @@ namespace
 
         return available;
     }
+    bool checkGeometryShadersAvailable()
+    {
+        // Create a temporary context in case the user checks
+        // before a GlResource is created, thus initializing
+        // the shared context
+        sf::Context context;
+
+        // Make sure that extensions are initialized
+        sf::priv::ensureExtensionsInit();
+
+        bool available = checkShadersAvailable() && GLEXT_geometry_shader4;
+
+        return available;
+    }
 
     // Transforms an array of 2D vectors into a contiguous array of scalars
     template <typename T>
@@ -285,9 +299,11 @@ bool Shader::loadFromFile(const std::string& filename, Type type)
 
     // Compile the shader program
     if (type == Vertex)
-        return compile(&shader[0], NULL);
+        return compile(&shader[0], NULL, NULL);
+    else if (type == Geometry)
+        return compile(NULL, &shader[0], NULL);
     else
-        return compile(NULL, &shader[0]);
+        return compile(NULL, NULL, &shader[0]);
 }
 
 
@@ -311,7 +327,39 @@ bool Shader::loadFromFile(const std::string& vertexShaderFilename, const std::st
     }
 
     // Compile the shader program
-    return compile(&vertexShader[0], &fragmentShader[0]);
+    return compile(&vertexShader[0], NULL, &fragmentShader[0]);
+}
+
+
+////////////////////////////////////////////////////////////
+bool Shader::loadFromFile(const std::string& vertexShaderFilename, const std::string& geometryShaderFilename, const std::string& fragmentShaderFilename)
+{
+    // Read the vertex shader file
+    std::vector<char> vertexShader;
+    if (!getFileContents(vertexShaderFilename, vertexShader))
+    {
+        err() << "Failed to open vertex shader file \"" << vertexShaderFilename << "\"" << std::endl;
+        return false;
+    }
+
+    // Read the geometry shader file
+    std::vector<char> geometryShader;
+    if (!getFileContents(geometryShaderFilename, geometryShader))
+    {
+        err() << "Failed to open geometry shader file \"" << geometryShaderFilename << "\"" << std::endl;
+        return false;
+    }
+
+    // Read the fragment shader file
+    std::vector<char> fragmentShader;
+    if (!getFileContents(fragmentShaderFilename, fragmentShader))
+    {
+        err() << "Failed to open fragment shader file \"" << fragmentShaderFilename << "\"" << std::endl;
+        return false;
+    }
+
+    // Compile the shader program
+    return compile(&vertexShader[0], &geometryShader[0], &fragmentShader[0]);
 }
 
 
@@ -320,9 +368,11 @@ bool Shader::loadFromMemory(const std::string& shader, Type type)
 {
     // Compile the shader program
     if (type == Vertex)
-        return compile(shader.c_str(), NULL);
+        return compile(shader.c_str(), NULL, NULL);
+    else if (type == Geometry)
+        return compile(NULL, shader.c_str(), NULL);
     else
-        return compile(NULL, shader.c_str());
+        return compile(NULL, NULL, shader.c_str());
 }
 
 
@@ -330,7 +380,15 @@ bool Shader::loadFromMemory(const std::string& shader, Type type)
 bool Shader::loadFromMemory(const std::string& vertexShader, const std::string& fragmentShader)
 {
     // Compile the shader program
-    return compile(vertexShader.c_str(), fragmentShader.c_str());
+    return compile(vertexShader.c_str(), NULL, fragmentShader.c_str());
+}
+
+
+////////////////////////////////////////////////////////////
+bool Shader::loadFromMemory(const std::string& vertexShader, const std::string& geometryShader, const std::string& fragmentShader)
+{
+    // Compile the shader program
+    return compile(vertexShader.c_str(), geometryShader.c_str(), fragmentShader.c_str());
 }
 
 
@@ -347,9 +405,11 @@ bool Shader::loadFromStream(InputStream& stream, Type type)
 
     // Compile the shader program
     if (type == Vertex)
-        return compile(&shader[0], NULL);
+        return compile(&shader[0], NULL, NULL);
+    else if (type == Geometry)
+        return compile(NULL, &shader[0], NULL);
     else
-        return compile(NULL, &shader[0]);
+        return compile(NULL, NULL, &shader[0]);
 }
 
 
@@ -373,7 +433,39 @@ bool Shader::loadFromStream(InputStream& vertexShaderStream, InputStream& fragme
     }
 
     // Compile the shader program
-    return compile(&vertexShader[0], &fragmentShader[0]);
+    return compile(&vertexShader[0], NULL, &fragmentShader[0]);
+}
+
+
+////////////////////////////////////////////////////////////
+bool Shader::loadFromStream(InputStream& vertexShaderStream, InputStream& geometryShaderStream, InputStream& fragmentShaderStream)
+{
+    // Read the vertex shader code from the stream
+    std::vector<char> vertexShader;
+    if (!getStreamContents(vertexShaderStream, vertexShader))
+    {
+        err() << "Failed to read vertex shader from stream" << std::endl;
+        return false;
+    }
+
+    // Read the geometry shader code from the stream
+    std::vector<char> geometryShader;
+    if (!getStreamContents(geometryShaderStream, geometryShader))
+    {
+        err() << "Failed to read geometry shader from stream" << std::endl;
+        return false;
+    }
+
+    // Read the fragment shader code from the stream
+    std::vector<char> fragmentShader;
+    if (!getStreamContents(fragmentShaderStream, fragmentShader))
+    {
+        err() << "Failed to read fragment shader from stream" << std::endl;
+        return false;
+    }
+
+    // Compile the shader program
+    return compile(&vertexShader[0], &geometryShader[0], &fragmentShader[0]);
 }
 
 
@@ -738,7 +830,19 @@ bool Shader::isAvailable()
 
 
 ////////////////////////////////////////////////////////////
-bool Shader::compile(const char* vertexShaderCode, const char* fragmentShaderCode)
+bool Shader::isGeometryAvailable()
+{
+    // TODO: Remove this lock when it becomes unnecessary in C++11
+    Lock lock(mutex);
+
+    static bool available = checkGeometryShadersAvailable();
+
+    return available;
+}
+
+
+////////////////////////////////////////////////////////////
+bool Shader::compile(const char* vertexShaderCode, const char* geometryShaderCode, const char* fragmentShaderCode)
 {
     ensureGlContext();
 
@@ -750,6 +854,14 @@ bool Shader::compile(const char* vertexShaderCode, const char* fragmentShaderCod
         return false;
     }
 
+    // Make sure we can use geometry shaders
+    if (geometryShaderCode && !isGeometryAvailable())
+    {
+        err() << "Failed to create a shader: your system doesn't support geometry shaders "
+              << "(you should test Shader::isGeometryAvailable() before trying to use geometry shaders)" << std::endl;
+        return false;
+    }
+
     // Destroy the shader if it was already created
     if (m_shaderProgram)
     {
@@ -794,6 +906,33 @@ bool Shader::compile(const char* vertexShaderCode, const char* fragmentShaderCod
         glCheck(GLEXT_glDeleteObject(vertexShader));
     }
 
+    // Create the geometry shader if needed
+    if (geometryShaderCode)
+    {
+        // Create and compile the shader
+        GLEXT_GLhandle geometryShader = GLEXT_glCreateShaderObject(GLEXT_GL_GEOMETRY_SHADER);
+        glCheck(GLEXT_glShaderSource(geometryShader, 1, &geometryShaderCode, NULL));
+        glCheck(GLEXT_glCompileShader(geometryShader));
+
+        // Check the compile log
+        GLint success;
+        glCheck(GLEXT_glGetObjectParameteriv(geometryShader, GLEXT_GL_OBJECT_COMPILE_STATUS, &success));
+        if (success == GL_FALSE)
+        {
+            char log[1024];
+            glCheck(GLEXT_glGetInfoLog(geometryShader, sizeof(log), 0, log));
+            err() << "Failed to compile geometry shader:" << std::endl
+                  << log << std::endl;
+            glCheck(GLEXT_glDeleteObject(geometryShader));
+            glCheck(GLEXT_glDeleteObject(shaderProgram));
+            return false;
+        }
+
+        // Attach the shader to the program, and delete it (not needed anymore)
+        glCheck(GLEXT_glAttachObject(shaderProgram, geometryShader));
+        glCheck(GLEXT_glDeleteObject(geometryShader));
+    }
+
     // Create the fragment shader if needed
     if (fragmentShaderCode)
     {
@@ -929,6 +1068,13 @@ bool Shader::loadFromFile(const std::string& vertexShaderFilename, const std::st
 }
 
 
+////////////////////////////////////////////////////////////
+bool Shader::loadFromFile(const std::string& vertexShaderFilename, const std::string& geometryShaderFilename, const std::string& fragmentShaderFilename)
+{
+    return false;
+}
+
+
 ////////////////////////////////////////////////////////////
 bool Shader::loadFromMemory(const std::string& shader, Type type)
 {
@@ -943,6 +1089,13 @@ bool Shader::loadFromMemory(const std::string& vertexShader, const std::string&
 }
 
 
+////////////////////////////////////////////////////////////
+bool Shader::loadFromMemory(const std::string& vertexShader, const std::string& geometryShader, const std::string& fragmentShader)
+{
+    return false;
+}
+
+
 ////////////////////////////////////////////////////////////
 bool Shader::loadFromStream(InputStream& stream, Type type)
 {
@@ -957,6 +1110,13 @@ bool Shader::loadFromStream(InputStream& vertexShaderStream, InputStream& fragme
 }
 
 
+////////////////////////////////////////////////////////////
+bool Shader::loadFromStream(InputStream& vertexShaderStream, InputStream& geometryShaderStream, InputStream& fragmentShaderStream)
+{
+    return false;
+}
+
+
 ////////////////////////////////////////////////////////////
 void Shader::setUniform(const std::string& name, float x)
 {
@@ -1170,7 +1330,14 @@ bool Shader::isAvailable()
 
 
 ////////////////////////////////////////////////////////////
-bool Shader::compile(const char* vertexShaderCode, const char* fragmentShaderCode)
+bool Shader::isGeometryAvailable()
+{
+    return false;
+}
+
+
+////////////////////////////////////////////////////////////
+bool Shader::compile(const char* vertexShaderCode, const char* geometryShaderCode, const char* fragmentShaderCode)
 {
     return false;
 }