Add drawText.

Add bmesh test data.

README.md

@@ -30,6 +30,9 @@ Camera rotate/zoom implemented, [here](http://www.songho.ca/opengl/gl_transform.
 Added x,z axis, looks better than last screenshot.   
 I have to use the GLU library, the previous implementation of drawSphere and drawCylinder looks not good, and take too much time to debug.
 <img src="screenshot/dust3d_node_edge_with_glu.png">
+*B-Mesh data struct*  
+I created the test nodes's geometry information from Blender. Here is the render result of `data/bmesh_test_1.h`
+<img src="screenshot/dust3d_bmesh_nodes.png">
 - [ ] Export Wavefront .obj  
 - [ ] Render B-Mesh result  
 - [ ] Design UI for monster parts configuration  

data/bmesh_test_1.h

@@ -0,0 +1,12 @@
+const float bmeshTest1Nodes[][4] = {
+  {0, -2.07575, 1.53902, 0.04122},                                          {1, 2.40837, 2.34882, 0.48585},
+      {2, -0.91403, 0.77069, 0.62299},            {3, 2.25224, 0.74973, 0.85115},
+                                    {4, 0, 0, 0},
+                               {5, 0.00920, -0.66115, -2.04601},
+                               {6, 0.01726, -0.88224, -2.87471}
+};
+
+const int bmeshTest1Edges[][2] = {
+  {0, 2}, {2, 4}, {4, 3}, {3, 1},
+  {4, 5}, {5, 6}
+};

src/draw.cpp

@@ -3,11 +3,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#ifdef __APPLE__
-#include <OpenGL/glu.h>
-#else
-#include <GL/glu.h>
-#endif
+#include <stdarg.h>
 #include "draw.h"
 
 static GLUquadricObj *quadricId = 0;
@@ -92,3 +88,11 @@ int drawGrid(float size, float step) {
   glEnable(GL_LIGHTING);
   return 0;
 }
+
+int drawPrintf(int x, int y, const char *fmt, ...) {
+  va_list args;
+  char text[1024];
+  va_start(args, fmt);
+  vsnprintf(text, sizeof(text), fmt, args);
+  return drawText(x, y, text);
+}

src/draw.h

@@ -1,6 +1,11 @@
 #ifndef DRAW_SPHERE_H
 #define DRAW_SPHERE_H
 #include "vector3d.h"
+#ifdef __APPLE__
+#include <OpenGL/glu.h>
+#else
+#include <GL/glu.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -21,6 +26,8 @@ void drawTriangle(triangle *poly);
 int drawCylinder(vec3 *topOrigin, vec3 *bottomOrigin, float radius, int slices,
     int stacks);
 int drawGrid(float size, float step);
+int drawText(int x, int y, char *text);
+int drawPrintf(int x, int y, const char *fmt, ...);
 
 #ifdef __cplusplus
 }

src/render.cpp

@@ -7,6 +7,8 @@
 #include "bmesh.h"
 #include "matrix.h"
 
+static QGLWidget *_this = 0;
+
 static int drawBmeshNode(bmesh *bm, bmeshNode *node) {
   float color1[3] = {1, 0, 0};
   glColor3fv(color1);
@@ -15,7 +17,7 @@ static int drawBmeshNode(bmesh *bm, bmeshNode *node) {
 }
 
 static int drawBmeshEdge(bmesh *bm, bmeshEdge *edge) {
-  float color2[3] = {0, 0, 1};
+  float color2[3] = {1, 1, 0};
   glColor3fv(color2);
   bmeshNode *firstNode = bmeshGetNode(bm, edge->firstNode);
   bmeshNode *secondNode = bmeshGetNode(bm, edge->secondNode);
@@ -23,6 +25,11 @@ static int drawBmeshEdge(bmesh *bm, bmeshEdge *edge) {
   return 0;
 }
 
+int drawText(int x, int y, char *text) {
+  _this->renderText(x, y, QString(text));
+  return 0;
+}
+
 Render::Render(QWidget *parent)
     : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) {
   QTimer *timer = new QTimer(this);
@@ -31,8 +38,8 @@ Render::Render(QWidget *parent)
 
   mouseX = 0;
   mouseY = 0;
-  cameraAngleX = 45;
-  cameraAngleY = -45;
+  cameraAngleX = 20;
+  cameraAngleY = -225;
   cameraDistance = 3;
 }
 
@@ -43,8 +50,14 @@ void Render::initializeGL() {
   glShadeModel(GL_SMOOTH);
   glEnable(GL_CULL_FACE);
   glEnable(GL_BLEND);
+  glDepthFunc(GL_LEQUAL);
+  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+  glEnable(GL_DEPTH_TEST);
+  glEnable(GL_LIGHTING);
+  glEnable(GL_CULL_FACE);
 
   qglClearColor(QWidget::palette().color(QWidget::backgroundRole()));
+  glClearStencil(0);
   glClearDepth(1.0f);
 
   GLfloat ambientLight[] = {0.0f, 0.0f, 0.0f, 1.0f};
@@ -61,26 +74,22 @@ void Render::initializeGL() {
 
   float shininess = 64.0f;
   float specularColor[] = {1.0, 1.0f, 1.0f, 1.0f};
-	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess); // range 0 ~ 128
+	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess);
 	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specularColor);
 
-  glClearStencil(0);
-  glClearDepth(1.0f);
-  glDepthFunc(GL_LEQUAL);
-  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-  glEnable(GL_DEPTH_TEST);
-  glEnable(GL_LIGHTING);
-  glEnable(GL_CULL_FACE);
-
   glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
   glEnable(GL_COLOR_MATERIAL);
 
   drawInit();
 }
 
+#include "../data/bmesh_test_1.h"
+
 void Render::paintGL() {
   static bmesh *bm = 0;
 
+  _this = this;
+
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix();
@@ -89,6 +98,10 @@ void Render::paintGL() {
   glRotatef(cameraAngleX, 1, 0, 0);
   glRotatef(cameraAngleY, 0, 1, 0);
 
+  glColor3f(0, 0, 0);
+  drawPrintf(0, 10, "cameraAngleX:%f cameraAngleY:%f", cameraAngleX,
+    cameraAngleY);
+
   drawGrid(10, 1);
 
   glEnable(GL_LIGHTING);
@@ -96,26 +109,24 @@ void Render::paintGL() {
   if (0 == bm) {
     bmeshNode node;
     bmeshEdge edge;
+    int i;
     bm = bmeshCreate();
 
-    memset(&node, 0, sizeof(node));
-    node.position.x = 0;
-    node.position.y = 0;
-    node.position.z = 3;
-    node.radius = 0.5;
-    bmeshAddNode(bm, &node);
+    for (i = 0; i < sizeof(bmeshTest1Nodes) / sizeof(bmeshTest1Nodes[0]); ++i) {
+      memset(&node, 0, sizeof(node));
+      node.position.x = bmeshTest1Nodes[i][1];
+      node.position.y = bmeshTest1Nodes[i][2];
+      node.position.z = bmeshTest1Nodes[i][3];
+      node.radius = 0.35;
+      bmeshAddNode(bm, &node);
+    }
 
-    memset(&node, 0, sizeof(node));
-    node.position.x = 1;
-    node.position.y = 0;
-    node.position.z = 2;
-    node.radius = 0.5;
-    bmeshAddNode(bm, &node);
-
-    memset(&edge, 0, sizeof(edge));
-    edge.firstNode = 1;
-    edge.secondNode = 0;
-    bmeshAddEdge(bm, &edge);
+    for (i = 0; i < sizeof(bmeshTest1Edges) / sizeof(bmeshTest1Edges[0]); ++i) {
+      memset(&edge, 0, sizeof(edge));
+      edge.firstNode = bmeshTest1Edges[i][0];
+      edge.secondNode = bmeshTest1Edges[i][1];
+      bmeshAddEdge(bm, &edge);
+    }
   }
 
   {
@@ -138,7 +149,7 @@ void Render::resizeGL(int w, int h) {
 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
-  glFrustum(-2, 2, -1.5, 1.5, 1, 100);
+  gluPerspective(60.0f, w/(h/2.0f), 1, 100);
 
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();