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ref: gl: fix crash in gl2_shim caused by MapBufferRange returning NULL

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This commit is contained in:
Alibek Omarov
2026-05-21 00:03:36 +05:00
parent 142dc7b87a
commit 7fce99481f
1 changed files with 54 additions and 2 deletions
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56
ref/gl/gl2_shim/gl2_shim.c
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@@ -465,8 +465,35 @@ static void GL2_InitTriQuads( void )
rpglBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
}
static void GL2_InitIncrementalBuffer( int i, GLuint size )
static void GL2_FreeIncrementalBufferAttr( int i, int valid_mappings )
{
if( gl2wrap.attrbufobj[i] )
{
if( gl2wrap_config.buf_storage )
{
for( int j = 0; j < valid_mappings; j++ )
{
rpglBindBufferARB( GL_ARRAY_BUFFER_ARB, gl2wrap.attrbufobj[i][j] );
pglUnmapBufferARB( GL_ARRAY_BUFFER_ARB );
}
rpglBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
}
pglDeleteBuffersARB( gl2wrap_config.cycle_buffers, gl2wrap.attrbufobj[i] );
Mem_Free( gl2wrap.attrbufobj[i] );
gl2wrap.attrbufobj[i] = NULL;
}
Mem_Free( gl2wrap.mappings[i] );
gl2wrap.mappings[i] = NULL;
gl2wrap.attrbuf[i] = NULL;
}
static qboolean GL2_InitIncrementalBuffer( int i, GLuint size )
{
int valid_j = 0;
gl2wrap.attrbufobj[i] = Mem_Calloc( r_temppool, gl2wrap_config.cycle_buffers * sizeof( GLuint ));
if( gl2wrap_config.buf_storage )
gl2wrap.mappings[i] = Mem_Calloc( r_temppool, gl2wrap_config.cycle_buffers * sizeof( void * ));
@@ -481,12 +508,23 @@ static void GL2_InitIncrementalBuffer( int i, GLuint size )
GL_MAP_PERSISTENT_BIT | MB( gl2wrap_config.coherent, COHERENT );
pglBufferStorage( GL_ARRAY_BUFFER_ARB, size, NULL, GL_MAP_WRITE_BIT | MB( gl2wrap_config.coherent, COHERENT ) | GL_MAP_PERSISTENT_BIT );
gl2wrap.mappings[i][j] = pglMapBufferRange( GL_ARRAY_BUFFER_ARB, 0, size, flags );
if( !gl2wrap.mappings[i][j] )
{
gEngfuncs.Con_Printf( S_ERROR "%s: pglMapBufferRange failed for attr %d, buffer %d\n", __func__, i, j );
goto err;
}
valid_j = j + 1;
}
else
pglBufferDataARB( GL_ARRAY_BUFFER_ARB, size, NULL, GL_STREAM_DRAW_ARB );
}
if( gl2wrap_config.buf_storage )
gl2wrap.attrbuf[i] = gl2wrap.mappings[i][0];
return true;
err:
GL2_FreeIncrementalBufferAttr( i, valid_j );
return false;
}
@@ -601,6 +639,7 @@ int GL2_ShimInit( void )
total = 0;
init_attrbufs:
for( int i = 0; i < GL2_ATTR_MAX; ++i )
{
GLuint size = GL2_MAX_VERTS * gl2wrap_attr_size[i] * sizeof( GLfloat );
@@ -611,7 +650,20 @@ int GL2_ShimInit( void )
if( gl2wrap_config.incremental )
{
GL2_InitIncrementalBuffer( i, size );
if( !GL2_InitIncrementalBuffer( i, size ))
{
for( int k = 0; k < i; k++ )
GL2_FreeIncrementalBufferAttr( k, gl2wrap_config.cycle_buffers );
gEngfuncs.Con_Printf( S_WARN "%s: falling back without buf_storage/incremental\n", __func__ );
gl2wrap_config.buf_storage = false;
gl2wrap_config.incremental = false;
if( !gEngfuncs.Sys_CheckParm( "-vao" ) && glConfig.context != CONTEXT_TYPE_GL_CORE ) // keep vao_mandatory for users who requested VAO
gl2wrap_config.vao_mandatory = false;
if( !gl2wrap_config.vao_mandatory )
gl2wrap_config.cycle_buffers = 1;
total = 0;
goto init_attrbufs;
}
}
else
{