[clip-stack] move lots of supporting code from cogl.c to cogl-clip-stack.c
There was quite a bit of code in cogl.c that was only used to support cogl-clip-stack.c, so this has now been moved to cogl-clip-stack.c
This commit is contained in:
Robert Bragg
parent
864e12df05
commit
7752ed98f1
@ -26,6 +26,7 @@
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#endif
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#include <string.h>
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#include <math.h>
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#include <glib.h>
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@ -36,26 +37,11 @@
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#include "cogl-internal.h"
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#include "cogl-draw-buffer-private.h"
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/* These are defined in the particular backend (float in GL vs fixed
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in GL ES) */
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void _cogl_set_clip_planes (float x,
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float y,
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float width,
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float height);
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void _cogl_add_stencil_clip (float x,
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float y,
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float width,
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float height,
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gboolean first);
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void _cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
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floatVec2 nodes_max,
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guint path_size,
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CoglPathNode *path,
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gboolean merge);
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void _cogl_enable_clip_planes (void);
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void _cogl_disable_clip_planes (void);
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void _cogl_disable_stencil_buffer (void);
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void _cogl_set_matrix (const CoglMatrix *matrix);
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typedef struct _CoglClipStack CoglClipStack;
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@ -114,6 +100,243 @@ struct _CoglClipStackEntryPath
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CoglPathNode path[1];
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};
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static void
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project_vertex (const CoglMatrix *modelview_matrix,
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const CoglMatrix *projection_matrix,
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float *vertex)
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{
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int i;
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/* Apply the modelview matrix */
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cogl_matrix_transform_point (modelview_matrix,
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&vertex[0], &vertex[1],
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&vertex[2], &vertex[3]);
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/* Apply the projection matrix */
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cogl_matrix_transform_point (projection_matrix,
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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 (GLint 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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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GLfloat plane[4];
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#else
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GLdouble plane[4];
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#endif
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GLfloat angle;
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CoglHandle draw_buffer = _cogl_get_draw_buffer ();
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CoglMatrixStack *modelview_stack =
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_cogl_draw_buffer_get_modelview_stack (draw_buffer);
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CoglMatrixStack *projection_stack =
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_cogl_draw_buffer_get_projection_stack (draw_buffer);
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CoglMatrix inverse_projection;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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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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_cogl_matrix_stack_flush_to_gl (modelview_stack, COGL_MATRIX_MODELVIEW);
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plane[0] = 0;
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plane[1] = -1.0;
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plane[2] = 0;
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plane[3] = vertex_a[1];
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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GE( glClipPlanef (plane_num, plane) );
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#else
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GE( glClipPlane (plane_num, plane) );
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#endif
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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 (float x_offset,
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float y_offset,
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float width,
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float height)
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{
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CoglHandle draw_buffer = _cogl_get_draw_buffer ();
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CoglMatrixStack *modelview_stack =
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_cogl_draw_buffer_get_modelview_stack (draw_buffer);
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CoglMatrix modelview_matrix;
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CoglMatrixStack *projection_stack =
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_cogl_draw_buffer_get_projection_stack (draw_buffer);
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CoglMatrix projection_matrix;
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float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
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float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
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float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
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float vertex_br[4] = { x_offset + width, y_offset + height,
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0, 1.0 };
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_cogl_matrix_stack_get (projection_stack, &projection_matrix);
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_cogl_matrix_stack_get (modelview_stack, &modelview_matrix);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
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/* If the order of the top and bottom lines is different from the
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order of the left and right lines then the clip rect must have
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been transformed so that the back is visible. We therefore need
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to swap one pair of vertices otherwise all of the planes will be
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the wrong way around */
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if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0)
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!= (vertex_bl[1] < vertex_tl[1] ? 1 : 0))
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{
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float temp[4];
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memcpy (temp, vertex_tl, sizeof (temp));
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memcpy (vertex_tl, vertex_tr, sizeof (temp));
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memcpy (vertex_tr, temp, sizeof (temp));
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memcpy (temp, vertex_bl, sizeof (temp));
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memcpy (vertex_bl, vertex_br, sizeof (temp));
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memcpy (vertex_br, temp, sizeof (temp));
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}
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set_clip_plane (GL_CLIP_PLANE0, vertex_tl, vertex_tr);
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set_clip_plane (GL_CLIP_PLANE1, vertex_tr, vertex_br);
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set_clip_plane (GL_CLIP_PLANE2, vertex_br, vertex_bl);
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set_clip_plane (GL_CLIP_PLANE3, vertex_bl, vertex_tl);
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}
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void
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add_stencil_clip_rectangle (float x_offset,
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float y_offset,
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float width,
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float height,
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gboolean first)
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{
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CoglHandle current_source;
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CoglHandle draw_buffer = _cogl_get_draw_buffer ();
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* We don't log changes to the stencil buffer so need to flush any
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* batched geometry before we start... */
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_cogl_journal_flush ();
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_cogl_draw_buffer_flush_state (draw_buffer, 0);
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/* temporarily swap in our special stenciling material */
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current_source = cogl_handle_ref (ctx->source_material);
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cogl_set_source (ctx->stencil_material);
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if (first)
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{
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GE( glEnable (GL_STENCIL_TEST) );
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/* Initially disallow everything */
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GE( glClearStencil (0) );
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GE( glClear (GL_STENCIL_BUFFER_BIT) );
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/* Punch out a hole to allow the rectangle */
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GE( glStencilFunc (GL_NEVER, 0x1, 0x1) );
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GE( glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE) );
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cogl_rectangle (x_offset, y_offset,
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x_offset + width, y_offset + height);
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}
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else
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{
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CoglMatrixStack *modelview_stack =
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_cogl_draw_buffer_get_modelview_stack (draw_buffer);
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CoglMatrixStack *projection_stack =
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_cogl_draw_buffer_get_projection_stack (draw_buffer);
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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( glStencilFunc (GL_NEVER, 0x1, 0x3) );
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GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) );
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cogl_rectangle (x_offset, y_offset,
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x_offset + width, y_offset + height);
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/* make sure our rectangle hits the stencil buffer before we
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* change the stencil operation */
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_cogl_journal_flush ();
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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( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
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_cogl_matrix_stack_push (projection_stack);
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_cogl_matrix_stack_load_identity (projection_stack);
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_cogl_matrix_stack_push (modelview_stack);
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_cogl_matrix_stack_load_identity (modelview_stack);
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cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
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_cogl_matrix_stack_pop (modelview_stack);
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_cogl_matrix_stack_pop (projection_stack);
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}
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/* make sure our rectangles hit the stencil buffer before we restore
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* the stencil function / operation */
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_cogl_journal_flush ();
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/* Restore the stencil mode */
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GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
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GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
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/* restore the original source material */
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cogl_set_source (current_source);
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cogl_handle_unref (current_source);
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}
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static void
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disable_stencil_buffer (void)
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{
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GE( glDisable (GL_STENCIL_TEST) );
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}
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static void
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enable_clip_planes (void)
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{
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GE( glEnable (GL_CLIP_PLANE0) );
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GE( glEnable (GL_CLIP_PLANE1) );
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GE( glEnable (GL_CLIP_PLANE2) );
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GE( glEnable (GL_CLIP_PLANE3) );
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}
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static void
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disable_clip_planes (void)
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{
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GE( glDisable (GL_CLIP_PLANE3) );
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GE( glDisable (GL_CLIP_PLANE2) );
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GE( glDisable (GL_CLIP_PLANE1) );
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GE( glDisable (GL_CLIP_PLANE0) );
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}
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/* FIXME: deprecate and replace with:
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* void
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* cogl_clip_push_window_rectangle (int x_offset,
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@ -436,8 +659,8 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
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clip_state->stencil_used = FALSE;
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_cogl_disable_clip_planes ();
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_cogl_disable_stencil_buffer ();
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disable_clip_planes ();
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disable_stencil_buffer ();
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GE (glDisable (GL_SCISSOR_TEST));
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/* If the stack is empty then there's nothing else to do */
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@ -484,7 +707,7 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
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that instead */
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if (has_clip_planes)
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{
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_cogl_set_clip_planes (rect->x_offset,
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set_clip_planes (rect->x_offset,
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rect->y_offset,
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rect->width,
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rect->height);
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@ -494,7 +717,7 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
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}
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else
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{
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_cogl_add_stencil_clip (rect->x_offset,
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add_stencil_clip_rectangle (rect->x_offset,
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rect->y_offset,
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rect->width,
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rect->height,
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@ -519,7 +742,7 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
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/* Enabling clip planes is delayed to now so that they won't affect
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setting up the stencil buffer */
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if (using_clip_planes)
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_cogl_enable_clip_planes ();
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enable_clip_planes ();
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if (scissor_x0 >= scissor_x1 || scissor_y0 >= scissor_y1)
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scissor_x0 = scissor_y0 = scissor_x1 = scissor_y1 = 0;
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@ -337,243 +337,6 @@ cogl_set_source_color (const CoglColor *color)
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cogl_set_source (ctx->default_material);
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}
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static void
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project_vertex (const CoglMatrix *modelview_matrix,
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const CoglMatrix *projection_matrix,
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float *vertex)
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{
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int i;
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/* Apply the modelview matrix */
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cogl_matrix_transform_point (modelview_matrix,
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&vertex[0], &vertex[1],
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&vertex[2], &vertex[3]);
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/* Apply the projection matrix */
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cogl_matrix_transform_point (projection_matrix,
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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 (GLint 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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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GLfloat plane[4];
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#else
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GLdouble plane[4];
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#endif
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GLfloat angle;
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CoglHandle draw_buffer = _cogl_get_draw_buffer ();
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CoglMatrixStack *modelview_stack =
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_cogl_draw_buffer_get_modelview_stack (draw_buffer);
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CoglMatrixStack *projection_stack =
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_cogl_draw_buffer_get_projection_stack (draw_buffer);
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CoglMatrix inverse_projection;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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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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_cogl_matrix_stack_flush_to_gl (modelview_stack, COGL_MATRIX_MODELVIEW);
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plane[0] = 0;
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plane[1] = -1.0;
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plane[2] = 0;
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plane[3] = vertex_a[1];
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#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
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GE( glClipPlanef (plane_num, plane) );
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#else
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GE( glClipPlane (plane_num, plane) );
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#endif
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_cogl_matrix_stack_pop (modelview_stack);
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}
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void
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_cogl_set_clip_planes (float x_offset,
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float y_offset,
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float width,
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float height)
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{
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CoglHandle draw_buffer = _cogl_get_draw_buffer ();
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CoglMatrixStack *modelview_stack =
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_cogl_draw_buffer_get_modelview_stack (draw_buffer);
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CoglMatrix modelview_matrix;
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CoglMatrixStack *projection_stack =
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_cogl_draw_buffer_get_projection_stack (draw_buffer);
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CoglMatrix projection_matrix;
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float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
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float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
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float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
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float vertex_br[4] = { x_offset + width, y_offset + height,
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0, 1.0 };
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_cogl_matrix_stack_get (projection_stack, &projection_matrix);
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_cogl_matrix_stack_get (modelview_stack, &modelview_matrix);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
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project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
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/* If the order of the top and bottom lines is different from the
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order of the left and right lines then the clip rect must have
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been transformed so that the back is visible. We therefore need
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to swap one pair of vertices otherwise all of the planes will be
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the wrong way around */
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if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0)
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!= (vertex_bl[1] < vertex_tl[1] ? 1 : 0))
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{
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float temp[4];
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memcpy (temp, vertex_tl, sizeof (temp));
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memcpy (vertex_tl, vertex_tr, sizeof (temp));
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memcpy (vertex_tr, temp, sizeof (temp));
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memcpy (temp, vertex_bl, sizeof (temp));
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memcpy (vertex_bl, vertex_br, sizeof (temp));
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memcpy (vertex_br, temp, sizeof (temp));
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}
|
||||
|
||||
set_clip_plane (GL_CLIP_PLANE0, vertex_tl, vertex_tr);
|
||||
set_clip_plane (GL_CLIP_PLANE1, vertex_tr, vertex_br);
|
||||
set_clip_plane (GL_CLIP_PLANE2, vertex_br, vertex_bl);
|
||||
set_clip_plane (GL_CLIP_PLANE3, vertex_bl, vertex_tl);
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_add_stencil_clip (float x_offset,
|
||||
float y_offset,
|
||||
float width,
|
||||
float height,
|
||||
gboolean first)
|
||||
{
|
||||
CoglHandle current_source;
|
||||
CoglHandle draw_buffer = _cogl_get_draw_buffer ();
|
||||
|
||||
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
||||
|
||||
/* We don't log changes to the stencil buffer so need to flush any
|
||||
* batched geometry before we start... */
|
||||
_cogl_journal_flush ();
|
||||
|
||||
_cogl_draw_buffer_flush_state (draw_buffer, 0);
|
||||
|
||||
/* temporarily swap in our special stenciling material */
|
||||
current_source = cogl_handle_ref (ctx->source_material);
|
||||
cogl_set_source (ctx->stencil_material);
|
||||
|
||||
if (first)
|
||||
{
|
||||
GE( glEnable (GL_STENCIL_TEST) );
|
||||
|
||||
/* Initially disallow everything */
|
||||
GE( glClearStencil (0) );
|
||||
GE( glClear (GL_STENCIL_BUFFER_BIT) );
|
||||
|
||||
/* Punch out a hole to allow the rectangle */
|
||||
GE( glStencilFunc (GL_NEVER, 0x1, 0x1) );
|
||||
GE( glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE) );
|
||||
|
||||
cogl_rectangle (x_offset, y_offset,
|
||||
x_offset + width, y_offset + height);
|
||||
}
|
||||
else
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_draw_buffer_get_modelview_stack (draw_buffer);
|
||||
CoglMatrixStack *projection_stack =
|
||||
_cogl_draw_buffer_get_projection_stack (draw_buffer);
|
||||
|
||||
/* Add one to every pixel of the stencil buffer in the
|
||||
rectangle */
|
||||
GE( glStencilFunc (GL_NEVER, 0x1, 0x3) );
|
||||
GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) );
|
||||
cogl_rectangle (x_offset, y_offset,
|
||||
x_offset + width, y_offset + height);
|
||||
|
||||
/* make sure our rectangle hits the stencil buffer before we
|
||||
* change the stencil operation */
|
||||
_cogl_journal_flush ();
|
||||
|
||||
/* Subtract one from all pixels in the stencil buffer so that
|
||||
only pixels where both the original stencil buffer and the
|
||||
rectangle are set will be valid */
|
||||
GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
|
||||
|
||||
_cogl_matrix_stack_push (projection_stack);
|
||||
_cogl_matrix_stack_load_identity (projection_stack);
|
||||
|
||||
_cogl_matrix_stack_push (modelview_stack);
|
||||
_cogl_matrix_stack_load_identity (modelview_stack);
|
||||
|
||||
cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
|
||||
|
||||
_cogl_matrix_stack_pop (modelview_stack);
|
||||
_cogl_matrix_stack_pop (projection_stack);
|
||||
}
|
||||
|
||||
/* make sure our rectangles hit the stencil buffer before we restore
|
||||
* the stencil function / operation */
|
||||
_cogl_journal_flush ();
|
||||
|
||||
/* Restore the stencil mode */
|
||||
GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
|
||||
GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
|
||||
|
||||
/* restore the original source material */
|
||||
cogl_set_source (current_source);
|
||||
cogl_handle_unref (current_source);
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_disable_stencil_buffer (void)
|
||||
{
|
||||
GE( glDisable (GL_STENCIL_TEST) );
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_enable_clip_planes (void)
|
||||
{
|
||||
GE( glEnable (GL_CLIP_PLANE0) );
|
||||
GE( glEnable (GL_CLIP_PLANE1) );
|
||||
GE( glEnable (GL_CLIP_PLANE2) );
|
||||
GE( glEnable (GL_CLIP_PLANE3) );
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_disable_clip_planes (void)
|
||||
{
|
||||
GE( glDisable (GL_CLIP_PLANE3) );
|
||||
GE( glDisable (GL_CLIP_PLANE2) );
|
||||
GE( glDisable (GL_CLIP_PLANE1) );
|
||||
GE( glDisable (GL_CLIP_PLANE0) );
|
||||
}
|
||||
|
||||
void
|
||||
cogl_set_viewport (int x,
|
||||
int y,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user