demos: add a fourth test case to VBO test for position/color in different VBOs
diff --git a/progs/tests/bufferobj.c b/progs/tests/bufferobj.c
index d1a8539..9edb86e 100644
--- a/progs/tests/bufferobj.c
+++ b/progs/tests/bufferobj.c
@@ -17,7 +17,8 @@
struct object
{
- GLuint BufferID;
+ GLuint VertexBufferID;
+ GLuint ColorBufferID;
GLuint ElementsBufferID;
GLuint NumVerts;
GLuint VertexOffset;
@@ -47,7 +48,7 @@
static void DrawObject( const struct object *obj )
{
- glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->VertexBufferID);
glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
glEnable(GL_VERTEX_ARRAY);
@@ -62,6 +63,7 @@
glPopClientAttrib();
}
#endif
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->ColorBufferID);
glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
glEnable(GL_COLOR_ARRAY);
@@ -92,7 +94,7 @@
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);
@@ -125,8 +127,11 @@
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);
+ }
}
@@ -182,7 +187,9 @@
}
-
+/*
+ * Non-interleaved position/color data.
+ */
static void MakeObject1(struct object *obj)
{
GLfloat *v, *c;
@@ -193,10 +200,11 @@
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++)
@@ -257,13 +265,18 @@
}
+/*
+ * 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);
@@ -287,6 +300,9 @@
}
+/*
+ * Use an index buffer and glDrawElements().
+ */
static void MakeObject3(struct object *obj)
{
GLfloat vertexData[1000];
@@ -314,8 +330,10 @@
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 */
@@ -332,6 +350,46 @@
}
+/*
+ * 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 )
{
@@ -358,7 +416,8 @@
MakeObject1(Objects + 0);
MakeObject2(Objects + 1);
MakeObject3(Objects + 2);
- NumObjects = 3;
+ MakeObject4(Objects + 3);
+ NumObjects = 4;
}