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a0441778ad
Since the Cogl 1.18 branch is actively maintained in parallel with the
master branch; this is a counter part to commit 1b83ef938fc16b which
re-licensed the master branch to use the MIT license.
This re-licensing is a follow up to the proposal that was sent to the
Cogl mailing list:
http://lists.freedesktop.org/archives/cogl/2013-December/001465.html
Note: there was a copyright assignment policy in place for Clutter (and
therefore Cogl which was part of Clutter at the time) until the 11th of
June 2010 and so we only checked the details after that point (commit
0bbf50f905)
For each file, authors were identified via this Git command:
$ git blame -p -C -C -C20 -M -M10 0bbf50f905..HEAD
We received blanket approvals for re-licensing all Red Hat and Collabora
contributions which reduced how many people needed to be contacted
individually:
- http://lists.freedesktop.org/archives/cogl/2013-December/001470.html
- http://lists.freedesktop.org/archives/cogl/2014-January/001536.html
Individual approval requests were sent to all the other identified authors
who all confirmed the re-license on the Cogl mailinglist:
http://lists.freedesktop.org/archives/cogl/2014-January
As well as updating the copyright header in all sources files, the
COPYING file has been updated to reflect the license change and also
document the other licenses used in Cogl such as the SGI Free Software
License B, version 2.0 and the 3-clause BSD license.
This patch was not simply cherry-picked from master; but the same
methodology was used to check the source files.
628 lines
22 KiB
C
628 lines
22 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2007,2008,2009,2010,2011,2012 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl-context-private.h"
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#include "cogl-util-gl-private.h"
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#include "cogl-primitives-private.h"
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#include "cogl-pipeline-opengl-private.h"
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#include "cogl-clip-stack-gl-private.h"
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#include "cogl-primitive-private.h"
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#ifndef GL_CLIP_PLANE0
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#define GL_CLIP_PLANE0 0x3000
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#define GL_CLIP_PLANE1 0x3001
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#define GL_CLIP_PLANE2 0x3002
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#define GL_CLIP_PLANE3 0x3003
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#define GL_CLIP_PLANE4 0x3004
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#define GL_CLIP_PLANE5 0x3005
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#endif
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static void
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project_vertex (const CoglMatrix *modelview_projection,
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float *vertex)
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{
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int i;
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cogl_matrix_transform_point (modelview_projection,
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&vertex[0], &vertex[1],
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&vertex[2], &vertex[3]);
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/* Convert from homogenized coordinates */
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for (i = 0; i < 4; i++)
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vertex[i] /= vertex[3];
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}
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static void
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set_clip_plane (CoglFramebuffer *framebuffer,
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int plane_num,
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const float *vertex_a,
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const float *vertex_b)
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{
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CoglContext *ctx = framebuffer->context;
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float planef[4];
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double planed[4];
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float angle;
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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CoglMatrix inverse_projection;
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cogl_matrix_stack_get_inverse (projection_stack, &inverse_projection);
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/* Calculate the angle between the axes and the line crossing the
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two points */
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angle = atan2f (vertex_b[1] - vertex_a[1],
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vertex_b[0] - vertex_a[0]) * (180.0/G_PI);
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cogl_matrix_stack_push (modelview_stack);
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/* Load the inverse of the projection matrix so we can specify the plane
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* in screen coordinates */
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cogl_matrix_stack_set (modelview_stack, &inverse_projection);
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/* Rotate about point a */
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cogl_matrix_stack_translate (modelview_stack,
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vertex_a[0], vertex_a[1], vertex_a[2]);
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/* Rotate the plane by the calculated angle so that it will connect
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the two points */
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cogl_matrix_stack_rotate (modelview_stack, angle, 0.0f, 0.0f, 1.0f);
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cogl_matrix_stack_translate (modelview_stack,
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-vertex_a[0], -vertex_a[1], -vertex_a[2]);
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/* Clip planes can only be used when a fixed function backend is in
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use so we know we can directly push this matrix to the builtin
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state */
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_cogl_matrix_entry_flush_to_gl_builtins (ctx,
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modelview_stack->last_entry,
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COGL_MATRIX_MODELVIEW,
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framebuffer,
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FALSE /* don't disable flip */);
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planef[0] = 0;
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planef[1] = -1.0;
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planef[2] = 0;
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planef[3] = vertex_a[1];
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switch (ctx->driver)
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{
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default:
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g_assert_not_reached ();
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break;
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case COGL_DRIVER_GLES1:
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GE( ctx, glClipPlanef (plane_num, planef) );
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break;
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case COGL_DRIVER_GL:
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case COGL_DRIVER_GL3:
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planed[0] = planef[0];
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planed[1] = planef[1];
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planed[2] = planef[2];
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planed[3] = planef[3];
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GE( ctx, glClipPlane (plane_num, planed) );
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break;
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}
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cogl_matrix_stack_pop (modelview_stack);
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}
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static void
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set_clip_planes (CoglFramebuffer *framebuffer,
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CoglMatrixEntry *modelview_entry,
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float x_1,
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float y_1,
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float x_2,
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float y_2)
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{
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CoglMatrix modelview_matrix;
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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CoglMatrix projection_matrix;
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CoglMatrix modelview_projection;
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float signed_area;
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float vertex_tl[4] = { x_1, y_1, 0, 1.0 };
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float vertex_tr[4] = { x_2, y_1, 0, 1.0 };
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float vertex_bl[4] = { x_1, y_2, 0, 1.0 };
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float vertex_br[4] = { x_2, y_2, 0, 1.0 };
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cogl_matrix_stack_get (projection_stack, &projection_matrix);
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cogl_matrix_entry_get (modelview_entry, &modelview_matrix);
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cogl_matrix_multiply (&modelview_projection,
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&projection_matrix,
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&modelview_matrix);
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project_vertex (&modelview_projection, vertex_tl);
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project_vertex (&modelview_projection, vertex_tr);
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project_vertex (&modelview_projection, vertex_bl);
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project_vertex (&modelview_projection, vertex_br);
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/* Calculate the signed area of the polygon formed by the four
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vertices so that we can know its orientation */
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signed_area = (vertex_tl[0] * (vertex_tr[1] - vertex_bl[1])
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+ vertex_tr[0] * (vertex_br[1] - vertex_tl[1])
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+ vertex_br[0] * (vertex_bl[1] - vertex_tr[1])
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+ vertex_bl[0] * (vertex_tl[1] - vertex_br[1]));
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/* Set the clip planes to form lines between all of the vertices
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using the same orientation as we calculated */
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if (signed_area > 0.0f)
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{
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/* counter-clockwise */
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set_clip_plane (framebuffer, GL_CLIP_PLANE0, vertex_tl, vertex_bl);
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set_clip_plane (framebuffer, GL_CLIP_PLANE1, vertex_bl, vertex_br);
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set_clip_plane (framebuffer, GL_CLIP_PLANE2, vertex_br, vertex_tr);
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set_clip_plane (framebuffer, GL_CLIP_PLANE3, vertex_tr, vertex_tl);
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}
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else
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{
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/* clockwise */
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set_clip_plane (framebuffer, GL_CLIP_PLANE0, vertex_tl, vertex_tr);
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set_clip_plane (framebuffer, GL_CLIP_PLANE1, vertex_tr, vertex_br);
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set_clip_plane (framebuffer, GL_CLIP_PLANE2, vertex_br, vertex_bl);
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set_clip_plane (framebuffer, GL_CLIP_PLANE3, vertex_bl, vertex_tl);
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}
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}
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static void
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add_stencil_clip_rectangle (CoglFramebuffer *framebuffer,
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CoglMatrixEntry *modelview_entry,
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float x_1,
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float y_1,
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float x_2,
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float y_2,
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CoglBool first)
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{
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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CoglContext *ctx = cogl_framebuffer_get_context (framebuffer);
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/* NB: This can be called while flushing the journal so we need
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* to be very conservative with what state we change.
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*/
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_cogl_context_set_current_projection_entry (ctx,
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projection_stack->last_entry);
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_cogl_context_set_current_modelview_entry (ctx, modelview_entry);
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if (first)
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{
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GE( ctx, glEnable (GL_STENCIL_TEST) );
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/* Initially disallow everything */
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GE( ctx, glClearStencil (0) );
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GE( ctx, glClear (GL_STENCIL_BUFFER_BIT) );
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/* Punch out a hole to allow the rectangle */
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GE( ctx, glStencilFunc (GL_NEVER, 0x1, 0x1) );
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GE( ctx, glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE) );
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_cogl_rectangle_immediate (framebuffer,
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ctx->stencil_pipeline,
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x_1, y_1, x_2, y_2);
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}
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else
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{
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/* Add one to every pixel of the stencil buffer in the
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rectangle */
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GE( ctx, glStencilFunc (GL_NEVER, 0x1, 0x3) );
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GE( ctx, glStencilOp (GL_INCR, GL_INCR, GL_INCR) );
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_cogl_rectangle_immediate (framebuffer,
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ctx->stencil_pipeline,
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x_1, y_1, x_2, y_2);
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/* Subtract one from all pixels in the stencil buffer so that
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only pixels where both the original stencil buffer and the
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rectangle are set will be valid */
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GE( ctx, glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
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_cogl_context_set_current_projection_entry (ctx, &ctx->identity_entry);
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_cogl_context_set_current_modelview_entry (ctx, &ctx->identity_entry);
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_cogl_rectangle_immediate (framebuffer,
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ctx->stencil_pipeline,
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-1.0, -1.0, 1.0, 1.0);
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}
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/* Restore the stencil mode */
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GE( ctx, glStencilFunc (GL_EQUAL, 0x1, 0x1) );
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GE( ctx, glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
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}
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typedef void (*SilhouettePaintCallback) (CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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void *user_data);
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static void
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add_stencil_clip_silhouette (CoglFramebuffer *framebuffer,
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SilhouettePaintCallback silhouette_callback,
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CoglMatrixEntry *modelview_entry,
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float bounds_x1,
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float bounds_y1,
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float bounds_x2,
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float bounds_y2,
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CoglBool merge,
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CoglBool need_clear,
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void *user_data)
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{
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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CoglContext *ctx = cogl_framebuffer_get_context (framebuffer);
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/* NB: This can be called while flushing the journal so we need
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* to be very conservative with what state we change.
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*/
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_cogl_context_set_current_projection_entry (ctx,
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projection_stack->last_entry);
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_cogl_context_set_current_modelview_entry (ctx, modelview_entry);
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_cogl_pipeline_flush_gl_state (ctx, ctx->stencil_pipeline,
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framebuffer, FALSE, FALSE);
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GE( ctx, glEnable (GL_STENCIL_TEST) );
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GE( ctx, glColorMask (FALSE, FALSE, FALSE, FALSE) );
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GE( ctx, glDepthMask (FALSE) );
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if (merge)
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{
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GE (ctx, glStencilMask (2));
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GE (ctx, glStencilFunc (GL_LEQUAL, 0x2, 0x6));
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}
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else
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{
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/* If we're not using the stencil buffer for clipping then we
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don't need to clear the whole stencil buffer, just the area
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that will be drawn */
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if (need_clear)
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/* If this is being called from the clip stack code then it
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will have set up a scissor for the minimum bounding box of
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all of the clips. That box will likely mean that this
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_cogl_clear won't need to clear the entire
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buffer. _cogl_framebuffer_clear_without_flush4f is used instead
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of cogl_clear because it won't try to flush the journal */
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_cogl_framebuffer_clear_without_flush4f (framebuffer,
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COGL_BUFFER_BIT_STENCIL,
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0, 0, 0, 0);
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else
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{
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/* Just clear the bounding box */
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GE( ctx, glStencilMask (~(GLuint) 0) );
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GE( ctx, glStencilOp (GL_ZERO, GL_ZERO, GL_ZERO) );
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_cogl_rectangle_immediate (framebuffer,
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ctx->stencil_pipeline,
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bounds_x1, bounds_y1,
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bounds_x2, bounds_y2);
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}
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GE (ctx, glStencilMask (1));
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GE (ctx, glStencilFunc (GL_LEQUAL, 0x1, 0x3));
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}
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GE (ctx, glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT));
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silhouette_callback (framebuffer, ctx->stencil_pipeline, user_data);
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if (merge)
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{
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/* Now we have the new stencil buffer in bit 1 and the old
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stencil buffer in bit 0 so we need to intersect them */
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GE (ctx, glStencilMask (3));
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GE (ctx, glStencilFunc (GL_NEVER, 0x2, 0x3));
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GE (ctx, glStencilOp (GL_DECR, GL_DECR, GL_DECR));
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/* Decrement all of the bits twice so that only pixels where the
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value is 3 will remain */
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_cogl_context_set_current_projection_entry (ctx, &ctx->identity_entry);
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_cogl_context_set_current_modelview_entry (ctx, &ctx->identity_entry);
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_cogl_rectangle_immediate (framebuffer, ctx->stencil_pipeline,
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-1.0, -1.0, 1.0, 1.0);
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_cogl_rectangle_immediate (framebuffer, ctx->stencil_pipeline,
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-1.0, -1.0, 1.0, 1.0);
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}
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GE (ctx, glStencilMask (~(GLuint) 0));
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GE (ctx, glDepthMask (TRUE));
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GE (ctx, glColorMask (TRUE, TRUE, TRUE, TRUE));
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GE (ctx, glStencilFunc (GL_EQUAL, 0x1, 0x1));
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GE (ctx, glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP));
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}
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static void
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paint_primitive_silhouette (CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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void *user_data)
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{
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_cogl_primitive_draw (user_data,
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framebuffer,
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pipeline,
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COGL_DRAW_SKIP_JOURNAL_FLUSH |
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COGL_DRAW_SKIP_PIPELINE_VALIDATION |
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COGL_DRAW_SKIP_FRAMEBUFFER_FLUSH |
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COGL_DRAW_SKIP_LEGACY_STATE);
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}
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static void
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add_stencil_clip_primitive (CoglFramebuffer *framebuffer,
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CoglMatrixEntry *modelview_entry,
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CoglPrimitive *primitive,
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float bounds_x1,
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float bounds_y1,
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float bounds_x2,
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float bounds_y2,
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CoglBool merge,
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CoglBool need_clear)
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{
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add_stencil_clip_silhouette (framebuffer,
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paint_primitive_silhouette,
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modelview_entry,
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bounds_x1,
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bounds_y1,
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bounds_x2,
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bounds_y2,
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merge,
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need_clear,
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primitive);
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}
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static void
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enable_clip_planes (CoglContext *ctx)
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{
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GE( ctx, glEnable (GL_CLIP_PLANE0) );
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GE( ctx, glEnable (GL_CLIP_PLANE1) );
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GE( ctx, glEnable (GL_CLIP_PLANE2) );
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GE( ctx, glEnable (GL_CLIP_PLANE3) );
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}
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static void
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disable_clip_planes (CoglContext *ctx)
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{
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GE( ctx, glDisable (GL_CLIP_PLANE3) );
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GE( ctx, glDisable (GL_CLIP_PLANE2) );
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GE( ctx, glDisable (GL_CLIP_PLANE1) );
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GE( ctx, glDisable (GL_CLIP_PLANE0) );
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}
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void
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_cogl_clip_stack_gl_flush (CoglClipStack *stack,
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CoglFramebuffer *framebuffer)
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{
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CoglContext *ctx = framebuffer->context;
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int has_clip_planes;
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CoglBool using_clip_planes = FALSE;
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CoglBool using_stencil_buffer = FALSE;
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int scissor_x0;
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int scissor_y0;
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int scissor_x1;
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int scissor_y1;
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CoglClipStack *entry;
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int scissor_y_start;
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/* If we have already flushed this state then we don't need to do
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anything */
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if (ctx->current_clip_stack_valid)
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{
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if (ctx->current_clip_stack == stack &&
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(ctx->needs_viewport_scissor_workaround == FALSE ||
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(framebuffer->viewport_age ==
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framebuffer->viewport_age_for_scissor_workaround &&
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ctx->viewport_scissor_workaround_framebuffer ==
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framebuffer)))
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|
return;
|
|
|
|
_cogl_clip_stack_unref (ctx->current_clip_stack);
|
|
}
|
|
|
|
ctx->current_clip_stack_valid = TRUE;
|
|
ctx->current_clip_stack = _cogl_clip_stack_ref (stack);
|
|
|
|
has_clip_planes =
|
|
_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES);
|
|
|
|
if (has_clip_planes)
|
|
disable_clip_planes (ctx);
|
|
GE( ctx, glDisable (GL_STENCIL_TEST) );
|
|
|
|
/* If the stack is empty then there's nothing else to do
|
|
*
|
|
* See comment below about ctx->needs_viewport_scissor_workaround
|
|
*/
|
|
if (stack == NULL && !ctx->needs_viewport_scissor_workaround)
|
|
{
|
|
COGL_NOTE (CLIPPING, "Flushed empty clip stack");
|
|
|
|
ctx->current_clip_stack_uses_stencil = FALSE;
|
|
GE (ctx, glDisable (GL_SCISSOR_TEST));
|
|
return;
|
|
}
|
|
|
|
/* Calculate the scissor rect first so that if we eventually have to
|
|
clear the stencil buffer then the clear will be clipped to the
|
|
intersection of all of the bounding boxes. This saves having to
|
|
clear the whole stencil buffer */
|
|
_cogl_clip_stack_get_bounds (stack,
|
|
&scissor_x0, &scissor_y0,
|
|
&scissor_x1, &scissor_y1);
|
|
|
|
/* XXX: ONGOING BUG: Intel viewport scissor
|
|
*
|
|
* Intel gen6 drivers don't correctly handle offset viewports, since
|
|
* primitives aren't clipped within the bounds of the viewport. To
|
|
* workaround this we push our own clip for the viewport that will
|
|
* use scissoring to ensure we clip as expected.
|
|
*
|
|
* TODO: file a bug upstream!
|
|
*/
|
|
if (ctx->needs_viewport_scissor_workaround)
|
|
{
|
|
_cogl_util_scissor_intersect (framebuffer->viewport_x,
|
|
framebuffer->viewport_y,
|
|
framebuffer->viewport_x +
|
|
framebuffer->viewport_width,
|
|
framebuffer->viewport_y +
|
|
framebuffer->viewport_height,
|
|
&scissor_x0, &scissor_y0,
|
|
&scissor_x1, &scissor_y1);
|
|
framebuffer->viewport_age_for_scissor_workaround =
|
|
framebuffer->viewport_age;
|
|
ctx->viewport_scissor_workaround_framebuffer =
|
|
framebuffer;
|
|
}
|
|
|
|
/* Enable scissoring as soon as possible */
|
|
if (scissor_x0 >= scissor_x1 || scissor_y0 >= scissor_y1)
|
|
scissor_x0 = scissor_y0 = scissor_x1 = scissor_y1 = scissor_y_start = 0;
|
|
else
|
|
{
|
|
/* We store the entry coordinates in Cogl coordinate space
|
|
* but OpenGL requires the window origin to be the bottom
|
|
* left so we may need to convert the incoming coordinates.
|
|
*
|
|
* NB: Cogl forces all offscreen rendering to be done upside
|
|
* down so in this case no conversion is needed.
|
|
*/
|
|
|
|
if (cogl_is_offscreen (framebuffer))
|
|
scissor_y_start = scissor_y0;
|
|
else
|
|
{
|
|
int framebuffer_height =
|
|
cogl_framebuffer_get_height (framebuffer);
|
|
|
|
scissor_y_start = framebuffer_height - scissor_y1;
|
|
}
|
|
}
|
|
|
|
COGL_NOTE (CLIPPING, "Flushing scissor to (%i, %i, %i, %i)",
|
|
scissor_x0, scissor_y0,
|
|
scissor_x1, scissor_y1);
|
|
|
|
GE (ctx, glEnable (GL_SCISSOR_TEST));
|
|
GE (ctx, glScissor (scissor_x0, scissor_y_start,
|
|
scissor_x1 - scissor_x0,
|
|
scissor_y1 - scissor_y0));
|
|
|
|
/* Add all of the entries. This will end up adding them in the
|
|
reverse order that they were specified but as all of the clips
|
|
are intersecting it should work out the same regardless of the
|
|
order */
|
|
for (entry = stack; entry; entry = entry->parent)
|
|
{
|
|
switch (entry->type)
|
|
{
|
|
case COGL_CLIP_STACK_PRIMITIVE:
|
|
{
|
|
CoglClipStackPrimitive *primitive_entry =
|
|
(CoglClipStackPrimitive *) entry;
|
|
|
|
COGL_NOTE (CLIPPING, "Adding stencil clip for primitive");
|
|
|
|
add_stencil_clip_primitive (framebuffer,
|
|
primitive_entry->matrix_entry,
|
|
primitive_entry->primitive,
|
|
primitive_entry->bounds_x1,
|
|
primitive_entry->bounds_y1,
|
|
primitive_entry->bounds_x2,
|
|
primitive_entry->bounds_y2,
|
|
using_stencil_buffer,
|
|
TRUE);
|
|
|
|
using_stencil_buffer = TRUE;
|
|
break;
|
|
}
|
|
case COGL_CLIP_STACK_RECT:
|
|
{
|
|
CoglClipStackRect *rect = (CoglClipStackRect *) entry;
|
|
|
|
/* We don't need to do anything extra if the clip for this
|
|
rectangle was entirely described by its scissor bounds */
|
|
if (!rect->can_be_scissor)
|
|
{
|
|
/* If we support clip planes and we haven't already used
|
|
them then use that instead */
|
|
if (has_clip_planes)
|
|
{
|
|
COGL_NOTE (CLIPPING,
|
|
"Adding clip planes clip for rectangle");
|
|
|
|
set_clip_planes (framebuffer,
|
|
rect->matrix_entry,
|
|
rect->x0,
|
|
rect->y0,
|
|
rect->x1,
|
|
rect->y1);
|
|
using_clip_planes = TRUE;
|
|
/* We can't use clip planes a second time */
|
|
has_clip_planes = FALSE;
|
|
}
|
|
else
|
|
{
|
|
COGL_NOTE (CLIPPING, "Adding stencil clip for rectangle");
|
|
|
|
add_stencil_clip_rectangle (framebuffer,
|
|
rect->matrix_entry,
|
|
rect->x0,
|
|
rect->y0,
|
|
rect->x1,
|
|
rect->y1,
|
|
!using_stencil_buffer);
|
|
using_stencil_buffer = TRUE;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case COGL_CLIP_STACK_WINDOW_RECT:
|
|
break;
|
|
/* We don't need to do anything for window space rectangles because
|
|
* their functionality is entirely implemented by the entry bounding
|
|
* box */
|
|
}
|
|
}
|
|
|
|
/* Enabling clip planes is delayed to now so that they won't affect
|
|
setting up the stencil buffer */
|
|
if (using_clip_planes)
|
|
enable_clip_planes (ctx);
|
|
|
|
ctx->current_clip_stack_uses_stencil = using_stencil_buffer;
|
|
}
|