| /************************************************************************** |
| * |
| * 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 */ |