creating shader program

Signed-off-by: Perminder <permindersingh089@gmail.com>

avogadro/rendering/CMakeLists.txt

@@ -104,6 +104,10 @@ set(shader_files
   "linestrip_fs.glsl"
   "linestrip_vs.glsl"
   "mesh_fs.glsl"
+  "bspline_tev.glsl"
+  "bspline_tcs.glsl"
+  "bspline_fs.glsl"
+  "bspline_vs.glsl"
   "mesh_opaque_fs.glsl"
   "mesh_vs.glsl"
   "solid_vs.glsl"

avogadro/rendering/cartoongeometry.cpp

@@ -4,24 +4,174 @@
 ******************************************************************************/
 
 #include "cartoongeometry.h"
+#include "shader.h"
+#include "shaderprogram.h"
+#include "camera.h"
+#include "bufferobject.h"
+
+
 
 #include <cmath>
 
+namespace {
+
+#include "bspline_vs.h"
+#include "bspline_fs.h"
+#include "bspline_tcs.h"
+#include "bspline_tev.h"
+
+} // namespace
+
+using Avogadro::Vector3f;
+using Avogadro::Vector3ub;
+using Avogadro::Vector4ub;
+
 namespace Avogadro::Rendering {
 
+class Cartoon::Private
+{
+public:
+  Private() {}
+
+  BufferObject vbo;
+  BufferObject ibo;
+
+  inline static Shader* vertexShader = nullptr;
+  inline static Shader* fragmentShader = nullptr;
+  inline static Shader* fragmentShaderOpaque = nullptr;
+  inline static ShaderProgram* program = nullptr;
+  inline static ShaderProgram* programOpaque = nullptr;
+
+  size_t numberOfVertices;
+  size_t numberOfIndices;
+};
+
+
 using Core::Residue;
 using std::vector;
 
 const float Cartoon::ELIPSE_RATIO = 0.75f;
 
 Cartoon::Cartoon()
-  : BSplineGeometry(false), m_minRadius(-1.0f), m_maxRadius(-1.0f)
+  : BSplineGeometry(false), m_minRadius(-1.0f), m_maxRadius(-1.0f), m_dirty(false), d(new Private)
 {}
 
 Cartoon::Cartoon(float minRadius, float maxRadius)
-  : BSplineGeometry(false), m_minRadius(minRadius), m_maxRadius(maxRadius)
+  : BSplineGeometry(false), m_minRadius(minRadius), m_maxRadius(maxRadius), m_dirty(true),
+    d(new Private),  m_vertices(other.m_vertices), m_indices(other.m_indices)
 {}
 
+Cartoon::~Cartoon()
+{
+  delete d;
+}
+
+void Cartoon::update()
+{
+  if (m_vertices.empty() || m_indices.empty())
+    return;
+
+  // Check if the VBOs are ready, if not get them ready.
+  if (!d->vbo.ready() || m_dirty) {
+    d->vbo.upload(m_vertices, BufferObject::ArrayBuffer);
+    d->ibo.upload(m_indices, BufferObject::ElementArrayBuffer);
+    d->numberOfVertices = m_vertices.size();
+    d->numberOfIndices = m_indices.size();
+    m_dirty = false;
+  }
+
+  // Build and link the shader if it has not been used yet.
+  if (d->vertexShader == nullptr) {
+    d->vertexShader = new Shader;
+    d->vertexShader->setType(Shader::Vertex);
+    d->vertexShader->setSource(bspline_vs);
+
+    d->fragmentShader = new Shader;
+    d->fragmentShader->setType(Shader::Fragment);
+    d->fragmentShader->setSource(bspline_fs);
+
+    if (!d->vertexShader->compile())
+      std::cout << d->vertexShader->error() << std::endl;
+    if (!d->fragmentShader->compile())
+      std::cout << d->fragmentShader->error() << std::endl;
+
+    if (d->program == nullptr)
+      d->program = new ShaderProgram;
+    d->program->attachShader(*d->vertexShader);
+    d->program->attachShader(*d->fragmentShader);
+    if (!d->program->link())
+      std::cout << d->program->error() << std::endl;
+  }
+}
+
+void Cartoon::render(const Camera& camera)
+{
+  if (m_indices.empty() || m_vertices.empty())
+    return;
+
+  // Prepare the VBOs, IBOs and shader program if necessary.
+  update();
+
+  ShaderProgram* program;
+  program = d->programOpaque;
+
+  if (!program->bind())
+    std::cout << program->error() << std::endl;
+
+  d->vbo.bind();
+  d->ibo.bind();
+
+  // Set up our attribute arrays.
+  if (!program->enableAttributeArray("vertex"))
+    std::cout << program->error() << std::endl;
+  if (!program->useAttributeArray("vertex", PackedVertex::vertexOffset(),
+                                 sizeof(PackedVertex), FloatType, 3,
+                                 ShaderProgram::NoNormalize)) {
+    std::cout << program->error() << std::endl;
+  }
+  if (!program->enableAttributeArray("color"))
+    std::cout << program->error() << std::endl;
+  if (!program->useAttributeArray("color", PackedVertex::colorOffset(),
+                                 sizeof(PackedVertex), UCharType, 4,
+                                 ShaderProgram::Normalize)) {
+    std::cout << program->error() << std::endl;
+  }
+  if (!program->enableAttributeArray("normal"))
+    std::cout << program->error() << std::endl;
+  if (!program->useAttributeArray("normal", PackedVertex::normalOffset(),
+                                 sizeof(PackedVertex), FloatType, 3,
+                                 ShaderProgram::NoNormalize)) {
+    std::cout << program->error() << std::endl;
+  }
+
+  // Set up our uniforms (model-view and projection matrices right now).
+  if (!program->setUniformValue("modelView", camera.modelView().matrix())) {
+    std::cout << program->error() << std::endl;
+  }
+  if (!program->setUniformValue("projection", camera.projection().matrix())) {
+    std::cout << program->error() << std::endl;
+  }
+  Matrix3f normalMatrix = camera.modelView().linear().inverse().transpose();
+  if (!program->setUniformValue("normalMatrix", normalMatrix))
+    std::cout << program->error() << std::endl;
+
+  // Render the loaded spheres using the shader and bound VBO.
+  glDrawRangeElements(GL_TRIANGLES, 0,
+                      static_cast<GLuint>(d->numberOfVertices - 1),
+                      static_cast<GLsizei>(d->numberOfIndices), GL_UNSIGNED_INT,
+                      reinterpret_cast<const GLvoid*>(0));
+
+  d->vbo.release();
+  d->ibo.release();
+
+  program->disableAttributeArray("vertex");
+  program->disableAttributeArray("color");
+  program->disableAttributeArray("normal");
+
+  program->release();
+}
+
+
 vector<ColorNormalVertex> Cartoon::computeCirclePoints(const Eigen::Affine3f& a,
                                                        const Eigen::Affine3f& b,
                                                        bool flat) const

avogadro/rendering/cartoongeometry.h

@@ -24,7 +24,30 @@ enum CartoonType
 
 class AVOGADRORENDERING_EXPORT Cartoon : public BSplineGeometry
 {
+
 public:
+  struct PackedVertex
+  {
+    Vector4ub color;          //  4 bytes
+    Vector3f normal;          // 12 bytes
+    Vector3f vertex;          // 12 bytes
+    unsigned char padding[4]; //  4 bytes
+
+    PackedVertex(const Vector4ub& c, const Vector3f& n, const Vector3f& v)
+      : color(c)
+      , normal(n)
+      , vertex(v)
+    {}
+
+    static int colorOffset() { return 0; }
+    static int normalOffset() { return static_cast<int>(sizeof(Vector4ub)); }
+    static int vertexOffset()
+    {
+      return normalOffset() + static_cast<int>(sizeof(Vector3f));
+    }
+  }; // 32 bytes total size - 16/32/64 are ideal for alignment.
+
+
   Cartoon();
   Cartoon(float minRadius, float maxRadius);
   static const float ELIPSE_RATIO;
@@ -39,6 +62,9 @@ class AVOGADRORENDERING_EXPORT Cartoon : public BSplineGeometry
                                                      bool flat) const override;
 
   float computeScale(size_t index, float t, float scale) const override;
+  void render(const Camera& camera) override;
+  void update();
+
 
   std::vector<std::pair<CartoonType, size_t>> m_type;
   float m_minRadius, m_maxRadius;