gpu: add support for triangle strips and fans, and change the DrawElement

calls so that they take a number of vertices or indexes, not elements.

src/easymesh/easymesh.cpp

@@ -125,7 +125,7 @@ void EasyMesh::Render(mat4 const &model, float damage)
     m_gpu.ibo->Bind();
     m_gpu.vdecl->DrawIndexedElements(MeshPrimitive::Triangles,
                                      0, 0, m_gpu.vertexcount,
-                                     0, m_gpu.indexcount / 3);
+                                     0, m_gpu.indexcount);
     m_gpu.ibo->Unbind();
     m_gpu.vdecl->Unbind();
 }

src/gpu/vertexbuffer.cpp

@@ -135,11 +135,23 @@ void VertexDeclaration::DrawElements(MeshPrimitive type, int skip, int count)
     switch (type)
     {
     case MeshPrimitive::Triangles:
-        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_TRIANGLELIST, skip, count)))
+        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_TRIANGLELIST,
+                                              skip, count)))
+            Abort();
+        break;
+    case MeshPrimitive::TriangleStrips:
+        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_TRIANGLESTRIP,
+                                              skip, count)))
+            Abort();
+        break;
+    case MeshPrimitive::TriangleFans:
+        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_TRIANGLEFAN,
+                                              skip, count)))
             Abort();
         break;
     case MeshPrimitive::Points:
-        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_POINTLIST, skip, count)))
+        if (FAILED(g_d3ddevice->DrawPrimitive(D3DPT_POINTLIST,
+                                              skip, count)))
             Abort();
         break;
     }
@@ -157,7 +169,13 @@ void VertexDeclaration::DrawElements(MeshPrimitive type, int skip, int count)
     switch (type)
     {
     case MeshPrimitive::Triangles:
-        glDrawArrays(GL_TRIANGLES, skip * 3, count * 3);
+        glDrawArrays(GL_TRIANGLES, skip, count);
+        break;
+    case MeshPrimitive::TriangleStrips:
+        glDrawArrays(GL_TRIANGLE_STRIP, skip, count);
+        break;
+    case MeshPrimitive::TriangleFans:
+        glDrawArrays(GL_TRIANGLE_FAN, skip, count);
         break;
     case MeshPrimitive::Points:
         glDrawArrays(GL_POINTS, skip, count);
@@ -185,11 +203,23 @@ void VertexDeclaration::DrawIndexedElements(MeshPrimitive type, int vbase,
     switch (type)
     {
     case MeshPrimitive::Triangles:
-        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, vbase, vskip, vcount, skip, count)))
+        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,
+                                           vbase, vskip, vcount, skip, count)))
+            Abort();
+        break;
+    case MeshPrimitive::TriangleStrips:
+        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_TRIANGLESTRIP,
+                                           vbase, vskip, vcount, skip, count)))
+            Abort();
+        break;
+    case MeshPrimitive::TriangleFans:
+        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_TRIANGLEFAN,
+                                           vbase, vskip, vcount, skip, count)))
             Abort();
         break;
     case MeshPrimitive::Points:
-        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_POINTLIST, vbase, vskip, vcount, skip, count)))
+        if (FAILED(g_d3ddevice->DrawIndexedPrimitive(D3DPT_POINTLIST,
+                                           vbase, vskip, vcount, skip, count)))
             Abort();
         break;
     }
@@ -209,7 +239,17 @@ void VertexDeclaration::DrawIndexedElements(MeshPrimitive type, int vbase,
     case MeshPrimitive::Triangles:
         /* FIXME: ignores most of the arguments! */
         (void)vbase; (void)vskip; (void)vcount; (void)skip;
-        glDrawElements(GL_TRIANGLES, count * 3, GL_UNSIGNED_SHORT, 0);
+        glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, 0);
+        break;
+    case MeshPrimitive::TriangleStrips:
+        /* FIXME: ignores most of the arguments! */
+        (void)vbase; (void)vskip; (void)vcount; (void)skip;
+        glDrawElements(GL_TRIANGLE_STRIP, count, GL_UNSIGNED_SHORT, 0);
+        break;
+    case MeshPrimitive::TriangleFans:
+        /* FIXME: ignores most of the arguments! */
+        (void)vbase; (void)vskip; (void)vcount; (void)skip;
+        glDrawElements(GL_TRIANGLE_FAN, count, GL_UNSIGNED_SHORT, 0);
         break;
     case MeshPrimitive::Points:
         /* FIXME: ignores most of the arguments! */

src/gpu/vertexbuffer.h

@@ -72,6 +72,8 @@ struct MeshPrimitive
     enum Value
     {
         Triangles,
+        TriangleStrips,
+        TriangleFans,
         Points,
     }
     m_value;
@@ -184,9 +186,16 @@ public:
     ~VertexDeclaration();
 
     void Bind();
+
+    /* Draw elements. See MeshPrimitive for a list of all available
+     * types. Both skip and count are numbers of vertices, not primitives. */
     void DrawElements(MeshPrimitive type, int skip, int count);
+
+    /* Draw elements. See MeshPrimitive for a list of all available
+     * types. Both skip and count are numbers of indices, not primitives. */
     void DrawIndexedElements(MeshPrimitive type, int vbase, int vskip,
                              int vcount, int skip, int count);
+
     void Unbind();
     void SetStream(VertexBuffer *vb, ShaderAttrib attr1,
                                      ShaderAttrib attr2 = ShaderAttrib(),

src/gradient.cpp

@@ -117,7 +117,7 @@ void Gradient::TickDraw(float seconds)
     data->m_vdecl->SetStream(data->m_cbo, attr_col);
 
     /* Draw arrays */
-    data->m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+    data->m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
 }
 
 Gradient::~Gradient()

src/scene.cpp

@@ -255,7 +255,7 @@ void Scene::Render() // XXX: rename to Blit()
         data->m_vdecl->SetStream(vb2, attr_tex);
 
         /* Draw arrays */
-        data->m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, (n - i) * 2);
+        data->m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, (n - i) * 6);
         data->m_vdecl->Unbind();
         data->tiles[i].tileset->Unbind();
     }

tutorial/01_triangle.cpp

@@ -59,7 +59,7 @@ public:
         m_shader->Bind();
         m_vdecl->SetStream(m_vbo, m_coord);
         m_vdecl->Bind();
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 1);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 3);
         m_vdecl->Unbind();
     }
 

tutorial/02_cube.cpp

@@ -112,7 +112,7 @@ public:
         m_vdecl->Bind();
         m_ibo->Bind();
         m_vdecl->DrawIndexedElements(MeshPrimitive::Triangles, 0, 0,
-                                     m_mesh.Count(), 0, m_indices.Count());
+                                     m_mesh.Count(), 0, m_indices.Count() * 3);
         m_ibo->Unbind();
         m_vdecl->Unbind();
     }

tutorial/03_noise.cpp

@@ -68,7 +68,7 @@ public:
         m_shader->SetUniform(m_time_uni, m_time);
         m_vdecl->SetStream(m_vbo, m_coord);
         m_vdecl->Bind();
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
         m_vdecl->Unbind();
     }
 

tutorial/08_fbo.cpp

@@ -99,7 +99,7 @@ public:
         m_shader->SetUniform(m_uni_texture, m_fbo->GetTexture(), 0);
         m_vdecl->SetStream(m_vbo, m_coord);
         m_vdecl->Bind();
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
         m_vdecl->Unbind();
 #endif
 
@@ -108,7 +108,7 @@ public:
         m_shader->SetUniform(m_uni_color, m_color);
         m_vdecl->SetStream(m_vbo, m_coord);
         m_vdecl->Bind();
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
         m_vdecl->Unbind();
         m_shader->Unbind();
         m_fbo->Unbind();
@@ -118,7 +118,7 @@ public:
         m_shader->SetUniform(m_uni_texture, m_fbo->GetTexture(), 0);
         m_vdecl->SetStream(m_vbo, m_coord);
         m_vdecl->Bind();
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
         m_vdecl->Unbind();
         m_shader->Unbind();
     }

tutorial/11_fractal.cpp

@@ -578,7 +578,7 @@ public:
 #elif !defined __CELLOS_LV2__ && !defined __ANDROID__
 #else
 #endif
-        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 2);
+        m_vdecl->DrawElements(MeshPrimitive::Triangles, 0, 6);
         m_vdecl->Unbind();
     }