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- /* generic.c */
-
- /* Demo of BEOS Mesa rendering */
-
- /*
- * See Mesa/include/GL/osmesa.h for documentation of the OSMesa functions.
- *
- * If you want to render BIG images you'll probably have to increase
- * MAX_WIDTH and MAX_HEIGHT in src/config.h.
- *
- * This program is in the public domain.
- *
- * BEOS output provided by Tinic Urou
- * 5uro@informatik.uni-hamburg.de
- */
-
- #include <AppKit.h>
- #include <InterfaceKit.h>
- #include <KernelKit.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <math.h>
- #include "GL/osmesa.h"
- #include "GL/glu.h"
-
-
- #define MAXOBJS 10000
- #define MAXSELECT 100
- #define MAXFEED 300
- #define SOLID 1
- #define LINE 2
- #define POINT 3
-
-
- GLenum directRender;
- GLint windW, windH;
-
- GLuint selectBuf[MAXSELECT];
- GLfloat feedBuf[MAXFEED];
- GLint vp[4];
- float zRotation = 90.0;
- float zoom = 1.0;
- GLint objectCount;
- GLint numObjects;
- struct object {
- float v1[2];
- float v2[2];
- float v3[2];
- float color[3];
- } objects[MAXOBJS];
- GLenum linePoly = GL_FALSE;
-
-
- static void InitObjects(GLint num)
- {
- GLint i;
- float x, y;
-
- if (num > MAXOBJS) {
- num = MAXOBJS;
- }
- if (num < 1) {
- num = 1;
- }
- objectCount = num;
-
- srand((unsigned int)time(NULL));
- for (i = 0; i < num; i++) {
- x = (rand() % 300) - 150;
- y = (rand() % 300) - 150;
-
- objects[i].v1[0] = x + (rand() % 50) - 25;
- objects[i].v2[0] = x + (rand() % 50) - 25;
- objects[i].v3[0] = x + (rand() % 50) - 25;
- objects[i].v1[1] = y + (rand() % 50) - 25;
- objects[i].v2[1] = y + (rand() % 50) - 25;
- objects[i].v3[1] = y + (rand() % 50) - 25;
- objects[i].color[0] = ((rand() % 100) + 50) / 150.0;
- objects[i].color[1] = ((rand() % 100) + 50) / 150.0;
- objects[i].color[2] = ((rand() % 100) + 50) / 150.0;
- }
- }
-
- static void Init(void)
- {
-
- numObjects = 10;
- InitObjects(numObjects);
- glGetIntegerv(GL_VIEWPORT, vp);
- }
-
- static void Reshape(int width, int height)
- {
-
- windW = (GLint)width;
- windH = (GLint)height;
- }
-
- static void Render(GLenum mode)
- {
- GLint i;
-
- for (i = 0; i < objectCount; i++) {
- if (mode == GL_SELECT) {
- glLoadName(i);
- }
- glColor3fv(objects[i].color);
- glBegin(GL_POLYGON);
- glVertex2fv(objects[i].v1);
- glVertex2fv(objects[i].v2);
- glVertex2fv(objects[i].v3);
- glEnd();
- }
- }
-
- static GLint DoSelect(GLint x, GLint y)
- {
- GLint hits;
-
- glSelectBuffer(MAXSELECT, selectBuf);
- (void)glRenderMode(GL_SELECT);
- glInitNames();
- glPushName(~0);
-
- glPushMatrix();
-
- glViewport(0, 0, windW, windH);
- glGetIntegerv(GL_VIEWPORT, vp);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPickMatrix(x, windH-y, 4, 4, vp);
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
-
- Render(GL_SELECT);
-
- glPopMatrix();
-
- hits = glRenderMode(GL_RENDER);
- if (hits <= 0) {
- return -1;
- }
-
- return selectBuf[(hits-1)*4+3];
- }
-
- static void RecolorTri(GLint h)
- {
-
- objects[h].color[0] = ((rand() % 100) + 50) / 150.0;
- objects[h].color[1] = ((rand() % 100) + 50) / 150.0;
- objects[h].color[2] = ((rand() % 100) + 50) / 150.0;
- }
-
- static void DeleteTri(GLint h)
- {
-
- objects[h] = objects[objectCount-1];
- objectCount--;
- }
-
- static void GrowTri(GLint h)
- {
- float v[2];
- float *oldV;
- GLint i;
-
- v[0] = objects[h].v1[0] + objects[h].v2[0] + objects[h].v3[0];
- v[1] = objects[h].v1[1] + objects[h].v2[1] + objects[h].v3[1];
- v[0] /= 3;
- v[1] /= 3;
-
- for (i = 0; i < 3; i++) {
- switch (i) {
- case 0:
- oldV = objects[h].v1;
- break;
- case 1:
- oldV = objects[h].v2;
- break;
- case 2:
- oldV = objects[h].v3;
- break;
- }
- oldV[0] = 1.5 * (oldV[0] - v[0]) + v[0];
- oldV[1] = 1.5 * (oldV[1] - v[1]) + v[1];
- }
- }
-
- static void Draw(void)
- {
-
- glPushMatrix();
-
- glViewport(0, 0, windW, windH);
- glGetIntegerv(GL_VIEWPORT, vp);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
-
- Render(GL_RENDER);
-
- glPopMatrix();
-
- glFlush();
- }
-
- static void DrawZoom(GLint x, GLint y)
- {
-
- glPushMatrix();
-
- glViewport(0, 0, windW, windH);
- glGetIntegerv(GL_VIEWPORT, vp);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPickMatrix(x, windH-y, 4, 4, vp);
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
-
- Render(GL_RENDER);
-
- glPopMatrix();
- }
-
- static void DumpFeedbackVert(GLint *i, GLint n)
- {
- GLint index;
-
- index = *i;
- if (index+7 > n) {
- *i = n;
- printf(" ???\n");
- return;
- }
- printf(" (%g %g %g), color = (%4.2f %4.2f %4.2f)\n",
- feedBuf[index],
- feedBuf[index+1],
- feedBuf[index+2],
- feedBuf[index+3],
- feedBuf[index+4],
- feedBuf[index+5]);
- index += 7;
- *i = index;
- }
-
- static void DrawFeedback(GLint n)
- {
- GLint i;
- GLint verts;
-
- printf("Feedback results (%d floats):\n", n);
- for (i = 0; i < n; i++) {
- switch ((GLint)feedBuf[i]) {
- case GL_POLYGON_TOKEN:
- printf("Polygon");
- i++;
- if (i < n) {
- verts = (GLint)feedBuf[i];
- i++;
- printf(": %d vertices", verts);
- } else {
- verts = 0;
- }
- printf("\n");
- while (verts) {
- DumpFeedbackVert(&i, n);
- verts--;
- }
- i--;
- break;
- case GL_LINE_TOKEN:
- printf("Line:\n");
- i++;
- DumpFeedbackVert(&i, n);
- DumpFeedbackVert(&i, n);
- i--;
- break;
- case GL_LINE_RESET_TOKEN:
- printf("Line Reset:\n");
- i++;
- DumpFeedbackVert(&i, n);
- DumpFeedbackVert(&i, n);
- i--;
- break;
- default:
- printf("%9.2f\n", feedBuf[i]);
- break;
- }
- }
- if (i == MAXFEED) {
- printf("...\n");
- }
- printf("\n");
- }
-
- static void DoFeedback(void)
- {
- GLint x;
-
- glFeedbackBuffer(MAXFEED, GL_3D_COLOR, feedBuf);
- (void)glRenderMode(GL_FEEDBACK);
-
- glPushMatrix();
-
- glViewport(0, 0, windW, windH);
- glGetIntegerv(GL_VIEWPORT, vp);
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-175, 175, -175, 175);
- glMatrixMode(GL_MODELVIEW);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glScalef(zoom, zoom, zoom);
- glRotatef(zRotation, 0, 0, 1);
-
- Render(GL_FEEDBACK);
-
- glPopMatrix();
-
- x = glRenderMode(GL_RENDER);
- if (x == -1) {
- x = MAXFEED;
- }
-
- DrawFeedback((GLint)x);
- }
-
- static GLenum Args(int argc, char **argv)
- {
- GLint i;
-
- directRender = GL_TRUE;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-dr") == 0) {
- directRender = GL_TRUE;
- } else if (strcmp(argv[i], "-ir") == 0) {
- directRender = GL_FALSE;
- } else {
- printf("%s (Bad option).\n", argv[i]);
- return GL_FALSE;
- }
- }
- return GL_TRUE;
- }
-
- int gl_width=300,gl_height=300;
-
- const ulong APP_SIGNATURE = '????';
- const ulong MSG_REDRAW = 1;
-
- class MesaWindow;
- class MesaView;
- class MesaApp;
-
- // Lets make our life easy and make them global:
-
- BBitmap *the_bitmap;
- MesaView *the_view;
- MesaWindow *the_window;
-
- class MesaView : public BView
- {
- public:
-
- MesaView(BRect frame):BView(frame,"Mesa View",B_FOLLOW_NONE,B_WILL_DRAW)
- {
- };
-
- void MouseDown(BPoint pos)
- {
- GLint hit;
- ulong button;
-
- Window()->Lock();
- GetMouse(&pos,&button);
- Window()->Unlock();
-
- hit = DoSelect((GLint)pos.x, (GLint)pos.y);
- if (hit != -1)
- {
- if (button & B_PRIMARY_MOUSE_BUTTON)
- {
- RecolorTri(hit);
- }
- if (button & B_SECONDARY_MOUSE_BUTTON)
- {
- GrowTri(hit);
- }
- if (button & B_TERTIARY_MOUSE_BUTTON)
- {
- DeleteTri(hit);
- }
- }
- };
-
- void KeyDown(ulong aKey)
- {
- switch(aKey)
- {
- BPoint pos;
- ulong buttons;
-
- case B_LEFT_ARROW:
- zRotation += 0.5;
- break;
- case B_RIGHT_ARROW:
- zRotation -= 0.5;
- break;
- case 'Z':
- zoom /= 0.75;
- break;
- case 'z':
- zoom *= 0.75;
- break;
- case 'f':
- DoFeedback();
- break;
- case 'd':
- GetMouse(&pos,&buttons);
- DrawZoom((GLint)pos.x, (GLint)pos.y);
- break;
- case 'l':
- linePoly = (GLenum)!linePoly;
- if (linePoly)
- {
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- }
- else
- {
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- }
- break;
- }
- };
-
- void Draw(BRect frame)
- {
- DrawBitmap(the_bitmap,BPoint(0,0));
- };
- };
-
- class MesaWindow : public BWindow
- {
- public:
-
- MesaWindow(int width, int height):BWindow(BRect(0,0,width-1,height-1),"MesaView",B_TITLED_WINDOW,B_NOT_RESIZABLE|B_NOT_ZOOMABLE)
- {
- // Move window to right position
- MoveTo(80, 24);
- // Create bitmap view
- Lock();
- AddChild(the_view = new MesaView(BRect(0, 0, (gl_width)-1, (gl_height)-1)));
- the_view->MakeFocus();
- Unlock();
- };
-
- void MessageReceived(BMessage *msg)
- {
- switch(msg->what)
- {
- case MSG_REDRAW:
- Lock();
- the_view->DrawBitmap(the_bitmap,BPoint(0,0));
- Draw();
- Unlock();
- PostMessage(MSG_REDRAW);
- break;
- default:
- BWindow::MessageReceived(msg);
- break;
- }
- };
-
- bool QuitRequested(void)
- {
- be_app->PostMessage(B_QUIT_REQUESTED);
- return TRUE;
- };
- };
-
- class MesaApp : public BApplication
- {
- OSMesaContext ctx;
-
- public:
-
- MesaApp():BApplication(APP_SIGNATURE)
- {
- the_window = NULL;
- the_bitmap = NULL;
- };
-
- void ReadyToRun(void)
- {
- // Allocate the bitmap
- the_bitmap = new BBitmap(BRect(0, 0, gl_width-1, gl_height-1), B_RGB_32_BIT);
-
- uchar *bits = (uchar *)the_bitmap->Bits();
-
- memset(bits,0,the_bitmap->BytesPerRow()*gl_height);
-
- // Open window
- the_window = new MesaWindow((gl_width),(gl_height));
- the_window->Show();
-
- unsigned char *buffer;
- double start,end;
-
- // Create an RGBA-mode context
- ctx = OSMesaCreateContext( GL_RGBA, NULL );
-
- // Bind the buffer to the context and make it current */
- OSMesaMakeCurrent( ctx, bits, GL_UNSIGNED_BYTE, gl_width, gl_height );
- OSMesaPixelStore( OSMESA_Y_UP, 0 );
-
- Init();
- Reshape(gl_width,gl_height);
- the_window->PostMessage(MSG_REDRAW);
- };
-
- bool QuitRequested(void)
- {
- // Make sure that the window closes first
- if (BApplication::QuitRequested())
- {
- OSMesaDestroyContext( ctx );
- if (the_bitmap) delete the_bitmap;
- return TRUE;
- }
- return FALSE;
- };
-
- void AboutRequested(void)
- {
- char str[256];
- sprintf(str, "MesaDemos, ported by Tinic Urou\n<5uro@informatik.uni-hamburg.de>\nFreely distributable.");
- BAlert *the_alert = new BAlert("", str, "OK");
- the_alert->Go();
- };
- };
-
- int main( int argc, char *argv[] )
- {
- MesaApp *the_app;
-
- Args(argc,argv);
-
- the_app = new MesaApp();
- the_app->Run();
- delete the_app;
-
- return 0;
- }
-