*/
-#define GL_GLEXT_PROTOTYPES
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
+#include <GL/glew.h>
#include <GL/glut.h>
#define NUM_OBJECTS 10
struct object
{
- GLuint BufferID;
+ GLuint VertexBufferID;
+ GLuint ColorBufferID;
GLuint ElementsBufferID;
GLuint NumVerts;
GLuint VertexOffset;
GLuint ColorOffset;
+ GLuint VertexStride;
+ GLuint ColorStride;
GLuint NumElements;
};
static struct object Objects[NUM_OBJECTS];
static GLuint NumObjects;
+static GLuint Win;
+
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLboolean Anim = GL_TRUE;
static void DrawObject( const struct object *obj )
{
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
- glVertexPointer(3, GL_FLOAT, 0, (void *) obj->VertexOffset);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
+ glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
glEnable(GL_VERTEX_ARRAY);
/* test push/pop attrib */
glPopClientAttrib();
}
#endif
- glColorPointer(3, GL_FLOAT, 0, (void *) obj->ColorOffset);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->ColorBufferID);
+ glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
glEnable(GL_COLOR_ARRAY);
if (obj->NumElements > 0) {
glClear( GL_COLOR_BUFFER_BIT );
for (i = 0; i < NumObjects; i++) {
- float x = 5.0 * ((float) i / (NumObjects-1) - 0.5);
+ float x = 7.0 * ((float) i / (NumObjects-1) - 0.5);
glPushMatrix();
glTranslatef(x, 0, 0);
glRotatef(Xrot, 1, 0, 0);
}
+static void FreeBuffers(void)
+{
+ int i;
+ for (i = 0; i < NUM_OBJECTS; i++) {
+ glDeleteBuffersARB(1, &Objects[i].VertexBufferID);
+ glDeleteBuffersARB(1, &Objects[i].ColorBufferID);
+ glDeleteBuffersARB(1, &Objects[i].ElementsBufferID);
+ }
+}
+
+
static void Key( unsigned char key, int x, int y )
{
const GLfloat step = 3.0;
Zrot += step;
break;
case 27:
+ FreeBuffers();
+ glutDestroyWindow(Win);
exit(0);
break;
}
}
-
+/*
+ * Non-interleaved position/color data.
+ */
static void MakeObject1(struct object *obj)
{
GLfloat *v, *c;
for (i = 0; i < 500; i++)
buffer[i] = i & 0xff;
- obj->BufferID = 0;
- glGenBuffersARB(1, &obj->BufferID);
- assert(obj->BufferID != 0);
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ obj->VertexBufferID = 0;
+ glGenBuffersARB(1, &obj->VertexBufferID);
+ obj->ColorBufferID = obj->VertexBufferID;
+ assert(obj->VertexBufferID != 0);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, 500, buffer, GL_STATIC_DRAW_ARB);
for (i = 0; i < 500; i++)
obj->NumVerts = 4;
obj->VertexOffset = 0;
obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+ obj->VertexStride = 0;
+ obj->ColorStride = 0;
obj->NumElements = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
}
+/*
+ * Interleaved position/color data.
+ */
static void MakeObject2(struct object *obj)
{
- GLfloat *v, *c;
+ GLfloat *v;
+ int start = 40; /* bytes, to test non-zero array offsets */
- glGenBuffersARB(1, &obj->BufferID);
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glGenBuffersARB(1, &obj->VertexBufferID);
+ obj->ColorBufferID = obj->VertexBufferID;
+
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, NULL, GL_STATIC_DRAW_ARB);
v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
- /* Make triangle */
- v[0] = -1; v[1] = -1; v[2] = 0;
- v[3] = 1; v[4] = -1; v[5] = 0;
- v[6] = 0; v[7] = 1; v[8] = 0;
- c = v + 9;
- c[0] = 0; c[1] = 1; c[2] = 0;
- c[3] = 0; c[4] = 1; c[5] = 0;
- c[6] = 1; c[7] = 1; c[8] = 0;
+ v += start / sizeof(GLfloat);
+
+ /* Make triangle: interleaved colors, then positions */
+ /* R G B X Y Z */
+ v[0] = 0; v[1] = 1; v[2] = 0; v[3] = -1; v[4] = -1; v[5] = 0;
+ v[6] = 0; v[7] = 1; v[8] = 0; v[9] = 1; v[10] = -1; v[11] = 0;
+ v[12] = 1; v[13] = 1; v[14] = 0; v[15] = 0; v[16] = 1; v[17] = 0;
+
obj->NumVerts = 3;
- obj->VertexOffset = 0;
- obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+ obj->VertexOffset = start + 3 * sizeof(GLfloat);
+ obj->ColorOffset = start;
+ obj->VertexStride = 6 * sizeof(GLfloat);
+ obj->ColorStride = 6 * sizeof(GLfloat);
+
obj->NumElements = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
}
+/*
+ * Use an index buffer and glDrawElements().
+ */
static void MakeObject3(struct object *obj)
{
GLfloat vertexData[1000];
obj->NumVerts = 4;
obj->VertexOffset = 0;
obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+ obj->VertexStride = 0;
+ obj->ColorStride = 0;
bytes = obj->NumVerts * (3 + 3) * sizeof(GLfloat);
/* Don't use glMap/UnmapBuffer for this object */
- glGenBuffersARB(1, &obj->BufferID);
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glGenBuffersARB(1, &obj->VertexBufferID);
+ obj->ColorBufferID = obj->VertexBufferID;
+
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, bytes, vertexData, GL_STATIC_DRAW_ARB);
/* Setup a buffer of indices to test the ELEMENTS path */
}
+/*
+ * Vertex and color data in different buffers.
+ */
+static void MakeObject4(struct object *obj)
+{
+ static const GLfloat vertexData[] = {
+ 0, -1, 0,
+ 0.5, 0, 0,
+ 0, 1, 0,
+ -0.5, 0, 0
+ };
+ static const GLfloat colorData[] = {
+ 1, 1, 1,
+ 1, 1, 0,
+ .5, .5, 0,
+ 1, 1, 0
+ };
+
+ obj->VertexOffset = 0;
+ obj->VertexStride = 0;
+ obj->ColorOffset = 0;
+ obj->ColorStride = 0;
+ obj->NumVerts = 4;
+
+ glGenBuffersARB(1, &obj->VertexBufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(vertexData), vertexData,
+ GL_STATIC_DRAW_ARB);
+
+ glGenBuffersARB(1, &obj->ColorBufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->ColorBufferID);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(colorData), colorData,
+ GL_STATIC_DRAW_ARB);
+
+ /* Setup a buffer of indices to test the ELEMENTS path */
+ obj->ElementsBufferID = 0;
+ obj->NumElements = 0;
+}
+
+
static void Init( void )
{
glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, data, GL_STATIC_DRAW_ARB);
glVertexPointer(3, GL_FLOAT, 0, (void *) 0);
glDeleteBuffersARB(1, &id);
- /*assert(!glIsBufferARB(id));*/
+ assert(!glIsBufferARB(id));
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
glVertexPointer(3, GL_FLOAT, 0, (void *) 0);
- /*assert(!glIsBufferARB(id));*/
+ assert(!glIsBufferARB(id));
}
MakeObject1(Objects + 0);
MakeObject2(Objects + 1);
MakeObject3(Objects + 2);
- NumObjects = 3;
+ MakeObject4(Objects + 3);
+ NumObjects = 4;
}
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 600, 300 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
- glutCreateWindow(argv[0]);
+ Win = glutCreateWindow(argv[0]);
+ glewInit();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutSpecialFunc( SpecialKey );
projects / mesa.git / blobdiff