From de8d410a99d29f496a033bd9335d07128b58c38b Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 17 Sep 2003 18:15:47 +0000
Subject: Exercise the GL_ELEMENT_ARRAY_BUFFER_ARB path
---
progs/tests/bufferobj.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
(limited to 'progs')
diff --git a/progs/tests/bufferobj.c b/progs/tests/bufferobj.c
index 4da8058ae7..4fda352e8f 100644
--- a/progs/tests/bufferobj.c
+++ b/progs/tests/bufferobj.c
@@ -18,9 +18,11 @@
struct object
{
GLuint BufferID;
+ GLuint ElementsBufferID;
GLuint NumVerts;
GLuint VertexOffset;
GLuint ColorOffset;
+ GLuint NumElements;
};
static struct object Objects[NUM_OBJECTS];
@@ -46,7 +48,16 @@ static void DrawObject( const struct object *obj )
glEnable(GL_VERTEX_ARRAY);
glColorPointer(3, GL_FLOAT, 0, (void *) obj->ColorOffset);
glEnable(GL_COLOR_ARRAY);
- glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
+ 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);
+ }
}
@@ -167,6 +178,7 @@ static void MakeObject1(struct object *obj)
obj->NumVerts = 4;
obj->VertexOffset = 0;
obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+ obj->NumElements = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
}
@@ -192,6 +204,7 @@ static void MakeObject2(struct object *obj)
obj->NumVerts = 3;
obj->VertexOffset = 0;
obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+ obj->NumElements = 0;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
}
@@ -200,6 +213,7 @@ static void MakeObject2(struct object *obj)
static void MakeObject3(struct object *obj)
{
GLfloat *v, *c;
+ GLuint *i;
glGenBuffersARB(1, &obj->BufferID);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
@@ -221,6 +235,18 @@ static void MakeObject3(struct object *obj)
obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+
+ /* Setup a buffer of indices to test the ELEMENTS path */
+ glGenBuffersARB(1, &obj->ElementsBufferID);
+ glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
+ glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 100, NULL, GL_STATIC_DRAW_ARB);
+ i = (GLuint *) glMapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB);
+ i[0] = 0;
+ i[1] = 1;
+ i[2] = 2;
+ i[3] = 3;
+ glUnmapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB);
+ obj->NumElements = 4;
}
--
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