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/**************************************************************************
*
* Copyright 2019 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Miscellantous state tracker utility functions, macros.
*/
#ifndef ST_UTIL
#define ST_UTIL
#include "state_tracker/st_context.h"
#ifdef __cplusplus
extern "C" {
#endif
/** For drawing quads for glClear, glDraw/CopyPixels, glBitmap, etc. */
struct st_util_vertex
{
float x, y, z;
float r, g, b, a;
float s, t;
};
/* Invalidate the readpixels cache to ensure we don't read stale data.
*/
static inline void
st_invalidate_readpix_cache(struct st_context *st)
{
if (unlikely(st->readpix_cache.src)) {
pipe_resource_reference(&st->readpix_cache.src, NULL);
pipe_resource_reference(&st->readpix_cache.cache, NULL);
}
}
#define Y_0_TOP 1
#define Y_0_BOTTOM 2
static inline GLuint
st_fb_orientation(const struct gl_framebuffer *fb)
{
if (fb && _mesa_is_winsys_fbo(fb)) {
/* Drawing into a window (on-screen buffer).
*
* Negate Y scale to flip image vertically.
* The NDC Y coords prior to viewport transformation are in the range
* [y=-1=bottom, y=1=top]
* Hardware window coords are in the range [y=0=top, y=H-1=bottom] where
* H is the window height.
* Use the viewport transformation to invert Y.
*/
return Y_0_TOP;
}
else {
/* Drawing into user-created FBO (very likely a texture).
*
* For textures, T=0=Bottom, so by extension Y=0=Bottom for rendering.
*/
return Y_0_BOTTOM;
}
}
static inline bool
st_user_clip_planes_enabled(struct gl_context *ctx)
{
return (ctx->API == API_OPENGL_COMPAT ||
ctx->API == API_OPENGLES) && /* only ES 1.x */
ctx->Transform.ClipPlanesEnabled;
}
/** clear-alloc a struct-sized object, with casting */
#define ST_CALLOC_STRUCT(T) (struct T *) calloc(1, sizeof(struct T))
#ifdef __cplusplus
}
#endif
#endif /* ST_UTIL */
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