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[clip-stack] Use signed integers while combining window space clip rectangles

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Use signed integers while combining window space clip rectangles, so we avoid
arithmatic errors later resulting in glScissor getting negative width and
height arguments.
This commit is contained in:
Robert Bragg 2009-06-22 00:58:32 +01:00
parent 21d02307eb
commit 096c1df0f4
1 changed files with 5 additions and 5 deletions
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10
common/cogl-clip-stack.c
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@ -317,10 +317,10 @@ _cogl_clip_stack_rebuild (void)
gboolean using_stencil_buffer = FALSE; gboolean using_stencil_buffer = FALSE;
GList *node; GList *node;
CoglClipStack *stack; CoglClipStack *stack;
guint scissor_x0 = 0; gint scissor_x0 = 0;
guint scissor_y0 = 0; gint scissor_y0 = 0;
guint scissor_x1 = G_MAXUINT; gint scissor_x1 = G_MAXINT;
guint scissor_y1 = G_MAXUINT; gint scissor_y1 = G_MAXINT;
_COGL_GET_CONTEXT (ctx, NO_RETVAL); _COGL_GET_CONTEXT (ctx, NO_RETVAL);
@ -418,7 +418,7 @@ _cogl_clip_stack_rebuild (void)
scissor_x0 = scissor_y0 = scissor_x1 = scissor_y1 = 0; scissor_x0 = scissor_y0 = scissor_x1 = scissor_y1 = 0;
if (!(scissor_x0 == 0 && scissor_y0 == 0 && if (!(scissor_x0 == 0 && scissor_y0 == 0 &&
scissor_x1 == G_MAXUINT && scissor_y1 == G_MAXUINT)) scissor_x1 == G_MAXINT && scissor_y1 == G_MAXINT))
{ {
GE (glEnable (GL_SCISSOR_TEST)); GE (glEnable (GL_SCISSOR_TEST));
GE (glScissor (scissor_x0, scissor_y0, GE (glScissor (scissor_x0, scissor_y0,