1 files changed, 147 insertions, 0 deletions
diff --git a/apps/openmb/renderer/Mesh.cpp b/apps/openmb/renderer/Mesh.cpp
new file mode 100644
index 0000000..4fb34ee
--- /dev/null
+++ b/apps/openmb/renderer/Mesh.cpp
@@ -0,0 +1,147 @@
+#include "Mesh.hpp"
+
+namespace renderer {
+Mesh::Mesh () : mVAO( 0 ), mVBO( 0 ), mEBO( 0 ), mVertexCount( 0 ), mIndexCount( 0 ), mMode( GL_TRIANGLES ) {}
+
+Mesh::~Mesh () {
+    if( mVBO ) {
+        glDeleteBuffers( 1, &mVBO );
+    }
+    if( mEBO ) {
+        glDeleteBuffers( 1, &mEBO );
+    }
+    if( mVAO ) {
+        glDeleteVertexArrays( 1, &mVAO );
+    }
+}
+
+bool Mesh::createFromPositions ( const std::vector<float>& positions, bool lines ) {
+    if( positions.empty() ) {
+        return false;
+    }
+
+    mMode        = lines ? GL_LINES : GL_TRIANGLES;
+    mVertexCount = static_cast<GLsizei>( positions.size() / 3 );
+
+    glGenVertexArrays( 1, &mVAO );
+    glGenBuffers( 1, &mVBO );
+
+    glBindVertexArray( mVAO );
+    glBindBuffer( GL_ARRAY_BUFFER, mVBO );
+    glBufferData( GL_ARRAY_BUFFER, positions.size() * sizeof( float ), positions.data(), GL_STATIC_DRAW );
+
+    glEnableVertexAttribArray( 0 );
+    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof( float ), (void*)0 );
+
+    glBindVertexArray( 0 );
+
+    return true;
+}
+
+bool Mesh::createFromPosTex ( const std::vector<float>& data ) {
+    if( data.empty() )
+        return false;
+
+    const size_t strideFloats = 5;
+    mMode                     = GL_TRIANGLES;
+    mVertexCount              = static_cast<GLsizei>( data.size() / strideFloats );
+
+    glGenVertexArrays( 1, &mVAO );
+    glGenBuffers( 1, &mVBO );
+
+    glBindVertexArray( mVAO );
+    glBindBuffer( GL_ARRAY_BUFFER, mVBO );
+    glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
+
+    glEnableVertexAttribArray( 0 );
+    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
+
+    glEnableVertexAttribArray( 1 );
+    glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
+                           (void*)( 3 * sizeof( float ) ) );
+
+    glBindVertexArray( 0 );
+    return true;
+}
+
+bool Mesh::createFromPosTexNormal ( const std::vector<float>& data ) {
+    if( data.empty() )
+        return false;
+
+    const size_t strideFloats = 8;
+    mMode                     = GL_TRIANGLES;
+    mVertexCount              = static_cast<GLsizei>( data.size() / strideFloats );
+
+    glGenVertexArrays( 1, &mVAO );
+    glGenBuffers( 1, &mVBO );
+
+    glBindVertexArray( mVAO );
+    glBindBuffer( GL_ARRAY_BUFFER, mVBO );
+    glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
+
+    glEnableVertexAttribArray( 0 );
+    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
+
+    glEnableVertexAttribArray( 1 );
+    glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
+                           (void*)( 3 * sizeof( float ) ) );
+
+    glEnableVertexAttribArray( 2 );
+    glVertexAttribPointer( 2, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
+                           (void*)( 5 * sizeof( float ) ) );
+
+    glBindVertexArray( 0 );
+    return true;
+}
+
+bool Mesh::createFromPosTexNormalIndexed ( const std::vector<float>&        data,
+                                           const std::vector<unsigned int>& indices ) {
+    if( data.empty() || indices.empty() )
+        return false;
+
+    const size_t strideFloats = 8;
+    mMode                     = GL_TRIANGLES;
+    mVertexCount              = static_cast<GLsizei>( data.size() / strideFloats );
+    mIndexCount               = static_cast<GLsizei>( indices.size() );
+
+    glGenVertexArrays( 1, &mVAO );
+    glGenBuffers( 1, &mVBO );
+    glGenBuffers( 1, &mEBO );
+
+    glBindVertexArray( mVAO );
+    glBindBuffer( GL_ARRAY_BUFFER, mVBO );
+    glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
+
+    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, mEBO );
+    glBufferData( GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof( unsigned int ), indices.data(),
+                  GL_STATIC_DRAW );
+
+    glEnableVertexAttribArray( 0 );
+    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
+
+    glEnableVertexAttribArray( 1 );
+    glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
+                           (void*)( 3 * sizeof( float ) ) );
+
+    glEnableVertexAttribArray( 2 );
+    glVertexAttribPointer( 2, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
+                           (void*)( 5 * sizeof( float ) ) );
+
+    glBindVertexArray( 0 );
+    return true;
+}
+
+void Mesh::draw () const {
+    if( mVAO == 0 )
+        return;
+
+    glBindVertexArray( mVAO );
+    if( mEBO && mIndexCount > 0 ) {
+        glDrawElements( mMode, mIndexCount, GL_UNSIGNED_INT, 0 );
+    } else {
+        glDrawArrays( mMode, 0, mVertexCount );
+    }
+    glBindVertexArray( 0 );
+}
+
+}   // namespace renderer