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Use VBOs in new example. Added a few comments.

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@775 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
spanne 2009-02-15 00:22:55 +00:00
parent 280a735302
commit 09efc858de
1 changed files with 63 additions and 12 deletions
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75
freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
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@ -46,6 +46,7 @@
#include <stdlib.h>
#include <stdio.h>
/* report GL errors, if any, to stderr */
void reportErrors(const char *message)
{
GLenum error;
@ -54,25 +55,75 @@ void reportErrors(const char *message)
}
}
void init(void)
/* extension entries */
void (*gl_GenBuffers) (GLsizei n, GLuint *buffers);
void (*gl_BindBuffer) (GLenum target, GLuint buffer);
void (*gl_BufferData) (GLenum target, GLsizeiptr size, const GLvoid *data,
GLenum usage);
void initExtensionEntries(void)
{
reportErrors ("at start of init");
gl_GenBuffers = glutGetProcAddress ("glGenBuffers");
gl_BindBuffer = glutGetProcAddress ("glBindBuffer");
gl_BufferData = glutGetProcAddress ("glBufferData");
}
/* vertex array data for a colored 2D triangle, consisting of RGB color values
and XY coordinates */
const GLsizei numColorComponents = 3;
const GLsizei numVertexComponents = 2;
const GLfloat varray[] = {
1.0f, 0.0f, 0.0f,
5.0f, 5.0f,
0.0f, 1.0f, 0.0f,
25.0f, 5.0f,
0.0f, 0.0f, 1.0f,
5.0f, 25.0f
};
/* the name of the vertex buffer object */
GLuint bufferName;
void initBuffer(void)
{
reportErrors ("at start of initBuffer");
gl_GenBuffers (1, &bufferName);
gl_BindBuffer (GL_ARRAY_BUFFER, bufferName);
gl_BufferData (GL_ARRAY_BUFFER, sizeof(varray), varray, GL_STATIC_DRAW);
reportErrors ("at end of initBuffer");
}
void initRendering(void)
{
reportErrors ("at start of initRendering");
glClearColor (0.0, 0.0, 0.0, 0.0);
glShadeModel (GL_SMOOTH);
reportErrors ("at end of init");
reportErrors ("at end of initRendering");
}
void init(void)
{
initExtensionEntries();
initBuffer();
initRendering();
}
void triangle(void)
{
const char *base = NULL;
const GLsizei stride = sizeof(GLfloat) * (numColorComponents + numVertexComponents);
const GLsizei numElements = sizeof(varray) / stride;
reportErrors ("at start of triangle");
glBegin (GL_TRIANGLES);
glColor3f (1.0, 0.0, 0.0);
glVertex2f (5.0, 5.0);
glColor3f (0.0, 1.0, 0.0);
glVertex2f (25.0, 5.0);
glColor3f (0.0, 0.0, 1.0);
glVertex2f (5.0, 25.0);
glEnd();
gl_BindBuffer (GL_ARRAY_BUFFER, bufferName);
glColorPointer (numColorComponents, GL_FLOAT, stride, base);
glVertexPointer(numVertexComponents, GL_FLOAT, stride,
base + sizeof(GLfloat) * numColorComponents);
glEnableClientState (GL_COLOR_ARRAY);
glEnableClientState (GL_VERTEX_ARRAY);
glDrawArrays(GL_TRIANGLES, 0, numElements);
reportErrors ("at end of triangle");
}
@ -144,7 +195,7 @@ int main(int argc, char** argv)
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitContextVersion(3, 0);
// glutInitContextFlags(GLUT_FORWARD_COMPATIBLE | GLUT_DEBUG);
/* glutInitContextFlags(GLUT_FORWARD_COMPATIBLE | GLUT_DEBUG); */
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow (argv[0]);