st_atom_viewport.c revision 2efabd9f5a711a7f6cd1846630244b7814bf25b3
1/************************************************************************** 2 * 3 * Copyright 2007 VMware, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 29#include "main/context.h" 30#include "main/viewport.h" 31#include "st_context.h" 32#include "st_atom.h" 33#include "pipe/p_context.h" 34#include "cso_cache/cso_context.h" 35 36/** 37 * Update the viewport transformation matrix. Depends on: 38 * - viewport pos/size 39 * - depthrange 40 * - window pos/size or FBO size 41 */ 42static void 43update_viewport( struct st_context *st ) 44{ 45 struct gl_context *ctx = st->ctx; 46 GLfloat yScale, yBias; 47 int i; 48 /* _NEW_BUFFERS 49 */ 50 if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) { 51 /* Drawing to a window. The corresponding gallium surface uses 52 * Y=0=TOP but OpenGL is Y=0=BOTTOM. So we need to invert the viewport. 53 */ 54 yScale = -1; 55 yBias = (GLfloat)ctx->DrawBuffer->Height; 56 } 57 else { 58 /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */ 59 yScale = 1.0; 60 yBias = 0.0; 61 } 62 63 /* _NEW_VIEWPORT 64 */ 65 for (i = 0; i < ctx->Const.MaxViewports; i++) 66 { 67 double scale[3], translate[3]; 68 _mesa_get_viewport_xform(ctx, i, scale, translate); 69 70 st->state.viewport[i].scale[0] = scale[0]; 71 st->state.viewport[i].scale[1] = scale[1] * yScale; 72 st->state.viewport[i].scale[2] = scale[2]; 73 74 st->state.viewport[i].translate[0] = translate[0]; 75 st->state.viewport[i].translate[1] = translate[1] * yScale + yBias; 76 st->state.viewport[i].translate[2] = translate[2]; 77 } 78 79 cso_set_viewport(st->cso_context, &st->state.viewport[0]); 80 if (ctx->Const.MaxViewports > 1) 81 st->pipe->set_viewport_states(st->pipe, 1, ctx->Const.MaxViewports - 1, &st->state.viewport[1]); 82} 83 84 85const struct st_tracked_state st_update_viewport = { 86 "st_update_viewport", /* name */ 87 { /* dirty */ 88 _NEW_BUFFERS | _NEW_VIEWPORT, /* mesa */ 89 0, /* st */ 90 }, 91 update_viewport /* update */ 92}; 93