move some common OpenGL methods to vcl

Change-Id: Ic96487afce64bfb0c1dfcc03c088e5d6e1b34ad3

5 files changed, 179 insertions, 136 deletions

diff --git a/chart2/source/view/main/OpenGLRender.cxx b/chart2/source/view/main/OpenGLRender.cxx
index 01331a04e15b..0ccb353004f9 100755
--- a/chart2/source/view/main/OpenGLRender.cxx
+++ b/chart2/source/view/main/OpenGLRender.cxx
@@ -35,9 +35,7 @@
 #include <vcl/virdev.hxx>
 #include <vcl/dibtools.hxx>
 
-#include <osl/file.hxx>
-#include <rtl/bootstrap.hxx>
-#include <config_folders.h>
+#include <vcl/opengl/OpenGLHelper.hxx>
 
 #include <boost/scoped_array.hpp>
 
@@ -96,133 +94,6 @@ static bool bGlewInit = false;
 
 namespace {
 
-OUString getShaderFolder()
-{
-    OUString aUrl("$BRAND_BASE_DIR/" LIBO_ETC_FOLDER);
-    rtl::Bootstrap::expandMacros(aUrl);
-
-    return aUrl + "/opengl/";
-}
-
-OUString maShaderFolder = getShaderFolder();
-
-OString loadShader(const OUString& rFilename)
-{
-    OUString aFileURL = maShaderFolder + rFilename +".glsl";
-    osl::File aFile(aFileURL);
-    if(aFile.open(osl_File_OpenFlag_Read) == osl::FileBase::E_None)
-    {
-        sal_uInt64 nSize = 0;
-        aFile.getSize(nSize);
-        char* content = new char[nSize+1];
-        sal_uInt64 nBytesRead = 0;
-        aFile.read(content, nSize, nBytesRead);
-        if(nSize != nBytesRead)
-            assert(false);
-
-        content[nSize] = 0;
-        return OString(content);
-    }
-    else
-    {
-        SAL_WARN("chart2.opengl", "could not load the file: " << aFileURL);
-    }
-
-    return OString();
-}
-
-}
-
-GLint OpenGLRender::LoadShaders(const OUString& rVertexShaderName,const OUString& rFragmentShaderName)
-{
-    // Create the shaders
-    GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
-    GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
-
-    GLint Result = GL_FALSE;
-    int InfoLogLength;
-
-    // Compile Vertex Shader
-    OString aVertexShaderSource = loadShader(rVertexShaderName);
-    char const * VertexSourcePointer = aVertexShaderSource.getStr();
-    glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
-    glCompileShader(VertexShaderID);
-
-    // Check Vertex Shader
-    glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
-    if ( !Result )
-    {
-        glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
-        if ( InfoLogLength > 0 )
-        {
-            std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
-            glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
-            VertexShaderErrorMessage.push_back('\0');
-            SAL_WARN("chart2.opengl", "vertex shader compile failed : " << &VertexShaderErrorMessage[0]);
-        }
-        else
-            SAL_WARN("chart2.opengl", "vertex shader compile failed without error log");
-
-        return 0;
-    }
-
-    // Compile Fragment Shader
-    OString aFragmentShaderSource = loadShader(rFragmentShaderName);
-    char const * FragmentSourcePointer = aFragmentShaderSource.getStr();
-    glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
-    glCompileShader(FragmentShaderID);
-
-    // Check Fragment Shader
-    glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
-    if ( !Result )
-    {
-        glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
-        if ( InfoLogLength > 0 )
-        {
-            std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
-            glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
-            FragmentShaderErrorMessage.push_back('\0');
-            SAL_WARN("chart2.opengl", "fragment shader compile failed : " << &FragmentShaderErrorMessage[0]);
-        }
-        else
-            SAL_WARN("chart2.opengl", "fragment shader compile failed without error log");
-
-
-        return 0;
-    }
-
-    // Link the program
-    GLint ProgramID = glCreateProgram();
-    glAttachShader(ProgramID, VertexShaderID);
-    glAttachShader(ProgramID, FragmentShaderID);
-    glLinkProgram(ProgramID);
-
-    // Check the program
-    glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
-    if ( !Result )
-    {
-        glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
-        if ( InfoLogLength > 0 )
-        {
-            std::vector<char> ProgramErrorMessage(InfoLogLength+1);
-            glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
-            ProgramErrorMessage.push_back('\0');
-            SAL_WARN("chart2.opengl", "Shader Program failed : " << &ProgramErrorMessage[0]);
-        }
-        else
-            SAL_WARN("chart2.opengl", "shader program link failed without error log");
-
-        return 0;
-    }
-
-    glDeleteShader(VertexShaderID);
-    glDeleteShader(FragmentShaderID);
-
-    return ProgramID;
-}
-
-namespace {
-
 GLfloat texCoords[] = {
     0.0f, 0.0f,
     1.0f, 0.0f,
@@ -287,26 +158,26 @@ int OpenGLRender::InitOpenGL()
 
     CHECK_GL_ERROR();
 
-    m_CommonProID = LoadShaders("commonVertexShader", "commonFragmentShader");
+    m_CommonProID = OpenGLHelper::LoadShaders("commonVertexShader", "commonFragmentShader");
     m_MatrixID = glGetUniformLocation(m_CommonProID, "MVP");
     m_2DVertexID = glGetAttribLocation(m_CommonProID, "vPosition");
     m_2DColorID = glGetUniformLocation(m_CommonProID, "vColor");
     CHECK_GL_ERROR();
 
 #if DEBUG_POSITIONING
-    m_DebugProID = LoadShaders("debugVertexShader", "debugFragmentShader");
+    m_DebugProID = OpenGLHelper::LoadShaders("debugVertexShader", "debugFragmentShader");
     m_DebugVertexID = glGetAttribLocation(m_DebugProID, "vPosition");
     CHECK_GL_ERROR();
 #endif
 
-    m_BackgroundProID = LoadShaders("backgroundVertexShader", "backgroundFragmentShader");
+    m_BackgroundProID = OpenGLHelper::LoadShaders("backgroundVertexShader", "backgroundFragmentShader");
     m_BackgroundMatrixID = glGetUniformLocation(m_BackgroundProID, "MVP");
     m_BackgroundVertexID = glGetAttribLocation(m_BackgroundProID, "vPosition");
     m_BackgroundColorID = glGetAttribLocation(m_BackgroundProID, "vColor");
 
     CHECK_GL_ERROR();
 
-    m_SymbolProID = LoadShaders("symbolVertexShader", "symbolFragmentShader");
+    m_SymbolProID = OpenGLHelper::LoadShaders("symbolVertexShader", "symbolFragmentShader");
     m_SymbolVertexID = glGetAttribLocation(m_SymbolProID, "vPosition");
     m_SymbolMatrixID = glGetUniformLocation(m_SymbolProID, "MVP");
     m_SymbolColorID = glGetUniformLocation(m_SymbolProID, "vColor");
@@ -314,7 +185,7 @@ int OpenGLRender::InitOpenGL()
 
     CHECK_GL_ERROR();
 
-    m_TextProID = LoadShaders("textVertexShader", "textFragmentShader");
+    m_TextProID = OpenGLHelper::LoadShaders("textVertexShader", "textFragmentShader");
     m_TextMatrixID = glGetUniformLocation(m_TextProID, "MVP");
     m_TextVertexID = glGetAttribLocation(m_TextProID, "vPosition");
     m_TextTexCoordID = glGetAttribLocation(m_TextProID, "texCoord");
diff --git a/chart2/source/view/main/OpenGLRender.hxx b/chart2/source/view/main/OpenGLRender.hxx
index d0121ad9b4cc..2f79e1c35fb0 100755
--- a/chart2/source/view/main/OpenGLRender.hxx
+++ b/chart2/source/view/main/OpenGLRender.hxx
@@ -108,7 +108,6 @@ public:
 
     void SetBackGroundColor(sal_uInt32 color1, sal_uInt32 color2, sal_uInt8 nAlpha);
 private:
-    GLint LoadShaders(const OUString& rVertexShaderName, const OUString& rFragmentShaderName);
     int CreateTextureObj(int width, int height);
     int CreateRenderObj(int width, int height);
     int CreateFrameBufferObj();
diff --git a/include/vcl/opengl/OpenGLHelper.hxx b/include/vcl/opengl/OpenGLHelper.hxx
new file mode 100644
index 000000000000..77d1b2840c45
--- /dev/null
+++ b/include/vcl/opengl/OpenGLHelper.hxx
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef VCL_OPENGLHELPERS_HXX
+#define VCL_OPENGLHELPERS_HXX
+
+#include <GL/glew.h>
+#include <vcl/vclopengl_dllapi.hxx>
+
+#include <rtl/ustring.hxx>
+
+class VCLOPENGL_DLLPUBLIC OpenGLHelper
+{
+public:
+    static GLint LoadShaders(const OUString& rVertexShaderName, const OUString& rFragmentShaderName);
+
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/Library_vclopengl.mk b/vcl/Library_vclopengl.mk
index e14899baf3de..84310bb84811 100644
--- a/vcl/Library_vclopengl.mk
+++ b/vcl/Library_vclopengl.mk
@@ -39,6 +39,7 @@ $(eval $(call gb_Library_use_libraries,vclopengl,\
 
 $(eval $(call gb_Library_add_exception_objects,vclopengl,\
     vcl/source/opengl/OpenGLContext \
+    vcl/source/opengl/OpenGLHelper \
 ))
 
 ifeq ($(strip $(OS)),WNT)
diff --git a/vcl/source/opengl/OpenGLHelper.cxx b/vcl/source/opengl/OpenGLHelper.cxx
new file mode 100644
index 000000000000..75eefe7c1f3f
--- /dev/null
+++ b/vcl/source/opengl/OpenGLHelper.cxx
@@ -0,0 +1,145 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <vcl/opengl/OpenGLHelper.hxx>
+
+#include <osl/file.hxx>
+#include <rtl/bootstrap.hxx>
+#include <config_folders.h>
+
+#include <vector>
+
+namespace {
+
+OUString getShaderFolder()
+{
+    OUString aUrl("$BRAND_BASE_DIR/" LIBO_ETC_FOLDER);
+    rtl::Bootstrap::expandMacros(aUrl);
+
+    return aUrl + "/opengl/";
+}
+
+OUString maShaderFolder = getShaderFolder();
+
+OString loadShader(const OUString& rFilename)
+{
+    OUString aFileURL = maShaderFolder + rFilename +".glsl";
+    osl::File aFile(aFileURL);
+    if(aFile.open(osl_File_OpenFlag_Read) == osl::FileBase::E_None)
+    {
+        sal_uInt64 nSize = 0;
+        aFile.getSize(nSize);
+        char* content = new char[nSize+1];
+        sal_uInt64 nBytesRead = 0;
+        aFile.read(content, nSize, nBytesRead);
+        if(nSize != nBytesRead)
+            assert(false);
+
+        content[nSize] = 0;
+        return OString(content);
+    }
+    else
+    {
+        SAL_WARN("vcl.opengl", "could not load the file: " << aFileURL);
+    }
+
+    return OString();
+}
+
+}
+
+GLint OpenGLHelper::LoadShaders(const OUString& rVertexShaderName,const OUString& rFragmentShaderName)
+{
+    // Create the shaders
+    GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+    GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+
+    GLint Result = GL_FALSE;
+    int InfoLogLength;
+
+    // Compile Vertex Shader
+    OString aVertexShaderSource = loadShader(rVertexShaderName);
+    char const * VertexSourcePointer = aVertexShaderSource.getStr();
+    glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
+    glCompileShader(VertexShaderID);
+
+    // Check Vertex Shader
+    glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
+    if ( !Result )
+    {
+        glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+        if ( InfoLogLength > 0 )
+        {
+            std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
+            glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
+            VertexShaderErrorMessage.push_back('\0');
+            SAL_WARN("vcl.opengl", "vertex shader compile failed : " << &VertexShaderErrorMessage[0]);
+        }
+        else
+            SAL_WARN("vcl.opengl", "vertex shader compile failed without error log");
+
+        return 0;
+    }
+
+    // Compile Fragment Shader
+    OString aFragmentShaderSource = loadShader(rFragmentShaderName);
+    char const * FragmentSourcePointer = aFragmentShaderSource.getStr();
+    glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
+    glCompileShader(FragmentShaderID);
+
+    // Check Fragment Shader
+    glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
+    if ( !Result )
+    {
+        glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+        if ( InfoLogLength > 0 )
+        {
+            std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
+            glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
+            FragmentShaderErrorMessage.push_back('\0');
+            SAL_WARN("vcl.opengl", "fragment shader compile failed : " << &FragmentShaderErrorMessage[0]);
+        }
+        else
+            SAL_WARN("vcl.opengl", "fragment shader compile failed without error log");
+
+
+        return 0;
+    }
+
+    // Link the program
+    GLint ProgramID = glCreateProgram();
+    glAttachShader(ProgramID, VertexShaderID);
+    glAttachShader(ProgramID, FragmentShaderID);
+    glLinkProgram(ProgramID);
+
+    // Check the program
+    glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
+    if ( !Result )
+    {
+        glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+        if ( InfoLogLength > 0 )
+        {
+            std::vector<char> ProgramErrorMessage(InfoLogLength+1);
+            glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
+            ProgramErrorMessage.push_back('\0');
+            SAL_WARN("vcl.opengl", "Shader Program failed : " << &ProgramErrorMessage[0]);
+        }
+        else
+            SAL_WARN("vcl.opengl", "shader program link failed without error log");
+
+        return 0;
+    }
+
+    glDeleteShader(VertexShaderID);
+    glDeleteShader(FragmentShaderID);
+
+    return ProgramID;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */