a9655f36fe
For drivers supporting PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET the buffer_offset value
will be interpreted as an signed int.
An example of application code causing a negative offset:
float b[] = { ... }; // 3 float for pos, 3 for color
glBufferData(GL_ARRAY_BUFFER, ..., b, ...);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), 0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), &b[3]);
^
should be 3 * sizeof(float)
The offset is a ptr so when interpreted as a signed int it can be negative.
This commit adds a verification that (int) buffer_offset is not negative - this would
indicate an application bug. Since it's too late to emit a GL_INVALID_VALUE error,
we replace the negative offset by 0 and emit a debug message.
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
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