Comment # 69
on bug 105251
from Hleb Valoshka
I have this fault with 2400G and mesa 18.3 & 19.1.1 with Linux 4.19 (other
versions haven't been tested).
It seems that Vega is unable to handle tiny VBO correctly. I have an old
application that uses a lot of immediate mode GL functions to create small
billboards using GL_QUADS like the following one:
glTexCoord2f(0, 0); glVertex(v0 * Size);
glTexCoord2f(1, 0); glVertex(v1 * Size);
glTexCoord2f(1, 1); glVertex(v2 * Size);
glTexCoord2f(0, 1); glVertex(v3 * Size);
Initially I have replaced this code with
static GLfloat Vtx[] =
{
-1, -1, 0, 0, 0,
1, -1, 0, 1, 0,
1, 1, 0, 1, 1,
-1, 1, 0, 0, 1
};
glBufferData(GL_ARRAY_BUFFER, sizeof(Vtx), Vtx, GL_STATIC_DRAW);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer(3, GL_FLOAT, 5*sizeof(GLfloat), 0);
glTexCoordPointer(2, GL_FLOAT, 5*sizeof(GLfloat), 3*sizeof(GLfloat));
+ I use VAO if it's available.
As a variant I used independent arrays for position and texture coordinates.
But with the same fault.
So as a result I added required data to another related VBO which contains 8192
vertices. Now I don't have this fault.
I know that OpenGL doesn't like herds of small VBOs, but the hardware failure
is not an expected result if we use them.
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