Add shaderprogram class.

5 files changed, 157 insertions, 1 deletions

diff --git a/src/render/shaders/shader.h b/src/render/shaders/shader.h
index 6ee964704..adcc29702 100644
--- a/src/render/shaders/shader.h
+++ b/src/render/shaders/shader.h
@@ -34,6 +34,9 @@ class Shader final : public Resource
 
         A_DELETE_COPY(Shader)
 
+        unsigned int getShaderId() const
+        { return mShaderId; }
+
     protected:
         unsigned int mShaderId;
 };
diff --git a/src/render/shaders/shaderprogram.cpp b/src/render/shaders/shaderprogram.cpp
new file mode 100644
index 000000000..7d79e5cb9
--- /dev/null
+++ b/src/render/shaders/shaderprogram.cpp
@@ -0,0 +1,49 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2014  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef USE_OPENGL
+
+#include "render/shaders/shaderprogram.h"
+
+#include "render/mgl.h"
+
+#include "render/shaders/shader.h"
+
+ShaderProgram::ShaderProgram(const unsigned int id,
+                             Shader *const vertex,
+                             Shader *const fragment) :
+    Resource(),
+    mProgramId(id),
+    mVertex(vertex),
+    mFragment(fragment)
+{
+}
+
+ShaderProgram::~ShaderProgram()
+{
+    if (mProgramId)
+        mglDeleteProgram(mProgramId);
+    if (mVertex)
+        mVertex->decRef();
+    if (mFragment)
+        mFragment->decRef();
+}
+
+#endif  // USE_OPENGL
diff --git a/src/render/shaders/shaderprogram.h b/src/render/shaders/shaderprogram.h
new file mode 100644
index 000000000..bb01a4802
--- /dev/null
+++ b/src/render/shaders/shaderprogram.h
@@ -0,0 +1,48 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2014  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef RENDER_SHADERPROGRAM_H
+#define RENDER_SHADERPROGRAM_H
+
+#ifdef USE_OPENGL
+
+#include "resources/resource.h"
+
+class Shader;
+
+class ShaderProgram final : public Resource
+{
+    public:
+        ShaderProgram(const unsigned int id,
+                      Shader *const vertex,
+                      Shader *const fragment);
+
+        ~ShaderProgram();
+
+        A_DELETE_COPY(ShaderProgram)
+
+    protected:
+        unsigned int mProgramId;
+        Shader *mVertex;
+        Shader *mFragment;
+};
+
+#endif  // USE_OPENGL
+#endif  // RENDER_SHADERPROGRAM_H
diff --git a/src/render/shaders/shadersmanager.cpp b/src/render/shaders/shadersmanager.cpp
index 85c5bf64e..e457ba473 100644
--- a/src/render/shaders/shadersmanager.cpp
+++ b/src/render/shaders/shadersmanager.cpp
@@ -28,6 +28,9 @@
 #include "render/mgl.h"
 
 #include "render/shaders/shader.h"
+#include "render/shaders/shaderprogram.h"
+
+#include "resources/resourcemanager.h"
 
 #include "utils/files.h"
 
@@ -59,4 +62,52 @@ Shader *ShadersManager::createShader(const unsigned int type,
     return nullptr;
 }
 
+ShaderProgram *ShadersManager::createProgram(const std::string &vertex,
+                                             const std::string &fragment)
+{
+    ResourceManager *const resman = ResourceManager::getInstance();
+    Shader *const vertexShader = static_cast<Shader*>(
+        resman->getShader(GL_VERTEX_SHADER, vertex));
+    if (!vertexShader)
+        return nullptr;
+
+    Shader *const fragmentShader = static_cast<Shader*>(
+        resman->getShader(GL_FRAGMENT_SHADER, fragment));
+
+    if (!fragmentShader)
+    {
+        vertexShader->decRef();
+        return nullptr;
+    }
+
+    GLuint programId = mglCreateProgram();
+    if (!programId)
+    {
+        vertexShader->decRef();
+        fragmentShader->decRef();
+        return nullptr;
+    }
+
+    mglAttachShader(programId, vertexShader->getShaderId());
+    mglAttachShader(programId, fragmentShader->getShaderId());
+    mglLinkProgram(programId);
+    GLint isLinked = 0;
+    mglGetProgramiv(programId, GL_LINK_STATUS, &isLinked);
+    if (isLinked == GL_TRUE)
+        return new ShaderProgram(programId, vertexShader, fragmentShader);
+
+    GLint len = 0;
+    mglGetProgramiv(programId, GL_INFO_LOG_LENGTH, &len);
+    char *buf = new char[len + 1];
+    mglGetProgramInfoLog(programId, len, &len, buf);
+    buf[len] = 0;
+    logger->log("Program '%s, %s' compilation error: %s",
+        vertexShader->getIdPath().c_str(),
+        fragmentShader->getIdPath().c_str(),
+        buf);
+    delete [] buf;
+    mglDeleteProgram(programId);
+    return nullptr;
+}
+
 #endif
diff --git a/src/render/shaders/shadersmanager.h b/src/render/shaders/shadersmanager.h
index 0ad8556c8..ba7d26438 100644
--- a/src/render/shaders/shadersmanager.h
+++ b/src/render/shaders/shadersmanager.h
@@ -27,13 +27,18 @@
 
 #include "localconsts.h"
 
-struct Shader;
+class Shader;
+class ShaderProgram;
 
 class ShadersManager final
 {
     public:
         Shader *createShader(const unsigned int type,
                              const std::string &fileName) A_WARN_UNUSED;
+
+        ShaderProgram *createProgram(const std::string &vertex,
+                                     const std::string &fragment)
+                                     A_WARN_UNUSED;
 };
 
 extern ShadersManager shaders;