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gerrit-public.fairphone.software / platform / external / mesa3d / a1ea7812b2b8869b60877995fdb957e9539309bd / . / progs / tests / fbotest2.c
blob: c3117b0f76768d03034ea3d32e6f80b129339344 [file] [log] [blame]
Brian Paul28bc3cd2006-04-14 16:25:27 +0000[diff] [blame]1/*
2 * Test GL_EXT_framebuffer_object
3 *
4 * Brian Paul
5 * 19 Mar 2006
6 */
7
8
9#define GL_GLEXT_PROTOTYPES
10#include <assert.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <math.h>
14#include <GL/glut.h>
15
16static int Width = 400, Height = 400;
17static GLuint MyFB, ColorRb, DepthRb;
18static GLboolean Animate = GL_TRUE;
19static GLfloat Rotation = 0.0;
20
21
22static void
23CheckError(int line)
24{
25 GLenum err = glGetError();
26 if (err) {
27 printf("fbotest2: GL Error 0x%x at line %d\n", (int) err, line);
28 }
29}
30
31
32static void
33Display( void )
34{
35 GLubyte *buffer = malloc(Width * Height * 4);
36 GLenum status;
37
38 CheckError(__LINE__);
39
40 /* draw to user framebuffer */
41 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
42 glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
43 glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
44
45 status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
46 if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
47 printf("fbotest2: Error: Framebuffer is incomplete!!!\n");
48 }
49
50 CheckError(__LINE__);
51
52 glClearColor(0.5, 0.5, 1.0, 0.0);
53 glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
54
55 glEnable(GL_DEPTH_TEST);
56 glEnable(GL_LIGHTING);
57 glEnable(GL_LIGHT0);
58
59 glPushMatrix();
60 glRotatef(30.0, 1, 0, 0);
61 glRotatef(Rotation, 0, 1, 0);
62 glutSolidTeapot(2.0);
63 glPopMatrix();
64
65 /* read from user framebuffer */
66 glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
67
68 /* draw to window */
69 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
70 glWindowPos2iARB(0, 0);
71 glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
72
73 free(buffer);
74 glutSwapBuffers();
75 CheckError(__LINE__);
76}
77
78
79static void
80Reshape( int width, int height )
81{
82 float ar = (float) width / (float) height;
83
84 glViewport( 0, 0, width, height );
85 glMatrixMode( GL_PROJECTION );
86 glLoadIdentity();
87 glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
88
89 glMatrixMode( GL_MODELVIEW );
90 glLoadIdentity();
91 glTranslatef( 0.0, 0.0, -15.0 );
92
93 glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
94 glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, width, height);
95 glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRb);
96 glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
97 width, height);
98
99 Width = width;
100 Height = height;
101}
102
103
104static void
105CleanUp(void)
106{
107 glDeleteFramebuffersEXT(1, &MyFB);
108 glDeleteRenderbuffersEXT(1, &ColorRb);
109 glDeleteRenderbuffersEXT(1, &DepthRb);
110 assert(!glIsFramebufferEXT(MyFB));
111 assert(!glIsRenderbufferEXT(ColorRb));
112 assert(!glIsRenderbufferEXT(DepthRb));
113 exit(0);
114}
115
116
117static void
118Idle(void)
119{
120 Rotation = glutGet(GLUT_ELAPSED_TIME) * 0.1;
121 glutPostRedisplay();
122}
123
124
125static void
126Key( unsigned char key, int x, int y )
127{
128 (void) x;
129 (void) y;
130 switch (key) {
131 case 'a':
132 Animate = !Animate;
133 if (Animate)
134 glutIdleFunc(Idle);
135 else
136 glutIdleFunc(NULL);
137 break;
138 case 27:
139 CleanUp();
140 break;
141 }
142 glutPostRedisplay();
143}
144
145
146static void
147Init( void )
148{
149 if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
150 printf("fbotest2: GL_EXT_framebuffer_object not found!\n");
151 exit(0);
152 }
153 printf("fbotest2: GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
154
155 glGenFramebuffersEXT(1, &MyFB);
156 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
157 assert(glIsFramebufferEXT(MyFB));
158
159 /* set color buffer */
160 glGenRenderbuffersEXT(1, &ColorRb);
161 glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
162 assert(glIsRenderbufferEXT(ColorRb));
163 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
164 GL_RENDERBUFFER_EXT, ColorRb);
165 glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
166
167 /* setup depth buffer */
168 glGenRenderbuffersEXT(1, &DepthRb);
169 glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRb);
170 assert(glIsRenderbufferEXT(DepthRb));
171 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
172 GL_RENDERBUFFER_EXT, DepthRb);
173 glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, Width, Height);
174
175 CheckError(__LINE__);
176
177 /* restore to default */
178 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
179 CheckError(__LINE__);
180}
181
182
183int
184main( int argc, char *argv[] )
185{
186 glutInit( &argc, argv );
187 glutInitWindowPosition( 0, 0 );
188 glutInitWindowSize(Width, Height);
189 glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
190 glutCreateWindow(argv[0]);
191 glutReshapeFunc( Reshape );
192 glutKeyboardFunc( Key );
193 glutDisplayFunc( Display );
194 if (Animate)
195 glutIdleFunc(Idle);
196 Init();
197 glutMainLoop();
198 return 0;
199}