/************************************************************************** * * 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 && fb->FlipY) { /* 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 */