/*
* Test GL_ARB_vertex_buffer_object
+ * Also test GL_ARB_vertex_array_object if supported
*
* Brian Paul
* 16 Sep 2003
*/
-#define GL_GLEXT_PROTOTYPES
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <math.h>
+#include <GL/glew.h>
#include <GL/glut.h>
#define NUM_OBJECTS 10
struct object
{
- GLuint BufferID;
+ GLuint ArrayObjectID; /** GL_ARB_vertex_array_object */
+ GLuint VertexBufferID;
+ GLuint ColorBufferID;
GLuint ElementsBufferID;
GLuint NumVerts;
GLuint VertexOffset;
GLuint VertexStride;
GLuint ColorStride;
GLuint NumElements;
+ GLuint MaxElement;
};
static struct object Objects[NUM_OBJECTS];
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLboolean Anim = GL_TRUE;
+static GLboolean Have_ARB_vertex_array_object = GL_FALSE;
static void CheckError(int line)
static void DrawObject( const struct object *obj )
{
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
- glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
- glEnable(GL_VERTEX_ARRAY);
+ if (Have_ARB_vertex_array_object && obj->ArrayObjectID) {
+ glBindVertexArray(obj->ArrayObjectID);
+
+ if (obj->NumElements > 0) {
+ /* indexed arrays */
+ glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
+ glDrawRangeElements(GL_LINE_LOOP, 0, obj->MaxElement,
+ obj->NumElements, GL_UNSIGNED_INT, NULL);
+ }
+ else {
+ /* non-indexed arrays */
+ glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
+ glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
+ }
+
+ glBindVertexArray(0);
+ }
+ else {
+ /* no vertex array objects, must set vertex/color pointers per draw */
+
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
+ glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
+ glEnableClientState(GL_VERTEX_ARRAY);
- /* test push/pop attrib */
- /* XXX this leads to a segfault with NVIDIA's 53.36 driver */
+ /* test push/pop attrib */
+ /* XXX this leads to a segfault with NVIDIA's 53.36 driver */
#if 0
- if (1)
- {
- glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
- /*glVertexPointer(3, GL_FLOAT, 0, (void *) (obj->VertexOffset + 10000));*/
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, 999999);
- glPopClientAttrib();
- }
+ if (1)
+ {
+ glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
+ /*glVertexPointer(3, GL_FLOAT, 0, (void *) (obj->VertexOffset + 10000));*/
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, 999999);
+ glPopClientAttrib();
+ }
#endif
- glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
- glEnable(GL_COLOR_ARRAY);
-
- if (obj->NumElements > 0) {
- /* indexed arrays */
- glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
- glDrawElements(GL_LINE_LOOP, obj->NumElements, GL_UNSIGNED_INT, NULL);
- }
- else {
- /* non-indexed arrays */
- glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
- glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->ColorBufferID);
+ glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
+ glEnableClientState(GL_COLOR_ARRAY);
+
+ if (obj->NumElements > 0) {
+ /* indexed arrays */
+ glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
+ glDrawElements(GL_LINE_LOOP, obj->NumElements, GL_UNSIGNED_INT, NULL);
+ }
+ else {
+ /* non-indexed arrays */
+ glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
+ glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
+ }
}
}
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].BufferID);
+ for (i = 0; i < NUM_OBJECTS; i++) {
+ glDeleteBuffersARB(1, &Objects[i].VertexBufferID);
+ glDeleteBuffersARB(1, &Objects[i].ColorBufferID);
+ glDeleteBuffersARB(1, &Objects[i].ElementsBufferID);
+ }
}
}
+/**
+ * If GL_ARB_vertex_array_object is supported, create an array object
+ * and set all the per-array state.
+ */
+static void
+CreateVertexArrayObject(struct object *obj)
+{
+ glGenVertexArrays(1, &obj->ArrayObjectID);
+ glBindVertexArray(obj->ArrayObjectID);
+
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
+ glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->ColorBufferID);
+ glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
+ glEnableClientState(GL_COLOR_ARRAY);
+
+ glBindVertexArray(0);
+}
+
+
+/*
+ * 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->VertexStride = 0;
obj->ColorStride = 0;
obj->NumElements = 0;
+ obj->MaxElement = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAPPED_ARB, &i);
assert(!i);
+
+ if (Have_ARB_vertex_array_object) {
+ CreateVertexArrayObject(obj);
+ }
}
+/*
+ * Interleaved position/color data.
+ */
static void MakeObject2(struct object *obj)
{
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);
obj->ColorStride = 6 * sizeof(GLfloat);
obj->NumElements = 0;
+ obj->MaxElement = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+
+ if (Have_ARB_vertex_array_object) {
+ CreateVertexArrayObject(obj);
+ }
}
+/*
+ * Use an index buffer and glDrawElements().
+ */
static void MakeObject3(struct object *obj)
{
GLfloat vertexData[1000];
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 */
i[3] = 3;
glUnmapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB);
obj->NumElements = 4;
+ obj->MaxElement = 3;
+
+ if (Have_ARB_vertex_array_object) {
+ CreateVertexArrayObject(obj);
+ }
+}
+
+
+/*
+ * 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;
+ obj->MaxElement = 0;
+
+ if (Have_ARB_vertex_array_object) {
+ CreateVertexArrayObject(obj);
+ }
}
}
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+ Have_ARB_vertex_array_object =
+ glutExtensionSupported("GL_ARB_vertex_array_object");
+
+ printf("Using GL_ARB_vertex_array_object: %s\n",
+ (Have_ARB_vertex_array_object ? "yes" : "no"));
+
+
/* Test buffer object deletion */
if (1) {
static GLubyte data[1000];
assert(!glIsBufferARB(id));
}
+ memset(Objects, 0, sizeof(Objects));
MakeObject1(Objects + 0);
MakeObject2(Objects + 1);
MakeObject3(Objects + 2);
- NumObjects = 3;
+ MakeObject4(Objects + 3);
+ NumObjects = 4;
}
glutInitWindowSize( 600, 300 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
Win = glutCreateWindow(argv[0]);
+ glewInit();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutSpecialFunc( SpecialKey );
projects / mesa.git / blobdiff