https://bugs.freedesktop.org/show_bug.cgi?id=34047
Summary: Assert in _tnl_import_array() when using GLfixed
vertex datatypes with GLESv2
Product: Mesa
Version: 7.9
Platform: x86 (IA32)
OS/Version: other
Status: NEW
Severity: critical
Priority: medium
Component: Other
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: david.le...@nokia.com
-Hardware/software setup:
Intel GMA 3150 (Atom N450) DRI i915
Meego 1.1 trunk
Mesa 7.9.1 / Mesa 7.10
Our program hits an assert in _tnl_import_array() when we try to use GLfixed
datatypes for vertices. It seems the _tnl_import_array() method is unable to
convert this datatype and just asserts to crash the program. According to the
GLESv2 spec, GLfixed datatypes are supported for vertex input.
We are using the following gl functions to render:
glVertexAttribPointer(); // Datatype is GL_FIXED
glDrawElements();
I prototyped a GLfixed to GLfloat conversion function in _tnl_import_array()and
it seems to have fixed the problem.
static void
convert_fixed_to_float(const struct gl_client_array *input,
const GLubyte *ptr, GLfloat *fptr,
GLuint count, GLuint sz)
{
GLuint i,j;
GLfixed *in =(GLfixed *)ptr;
for (i = 0; i < count; i++) {
for (j = 0; j < input->Size; j++) {
*fptr = (GLfloat)((*in)*(1/65536.0f));
in++;
fptr++;
}
ptr += input->StrideB;
}
}
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