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[clip-stack] move lots of supporting code from cogl.c to cogl-clip-stack.c

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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 2009-11-04 19:42:17 +00:00
parent d4ffa2f819
commit 6ca49145f4
2 changed files with 250 additions and 264 deletions
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277
cogl/cogl-clip-stack.c
View File

@ -26,6 +26,7 @@
#endif
#include <string.h>
#include <math.h>
#include <glib.h>
@ -36,26 +37,11 @@
#include "cogl-internal.h"
#include "cogl-draw-buffer-private.h"
/* These are defined in the particular backend (float in GL vs fixed
in GL ES) */
void _cogl_set_clip_planes (float x,
float y,
float width,
float height);
void _cogl_add_stencil_clip (float x,
float y,
float width,
float height,
gboolean first);
void _cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
floatVec2 nodes_max,
guint path_size,
CoglPathNode *path,
gboolean merge);
void _cogl_enable_clip_planes (void);
void _cogl_disable_clip_planes (void);
void _cogl_disable_stencil_buffer (void);
void _cogl_set_matrix (const CoglMatrix *matrix);
typedef struct _CoglClipStack CoglClipStack;
@ -114,6 +100,243 @@ struct _CoglClipStackEntryPath
CoglPathNode path[1];
};
static void
project_vertex (const CoglMatrix *modelview_matrix,
const CoglMatrix *projection_matrix,
float *vertex)
{
int i;
/* Apply the modelview matrix */
cogl_matrix_transform_point (modelview_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Apply the projection matrix */
cogl_matrix_transform_point (projection_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Convert from homogenized coordinates */
for (i = 0; i < 4; i++)
vertex[i] /= vertex[3];
}
static void
set_clip_plane (GLint plane_num,
const float *vertex_a,
const float *vertex_b)
{
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
GLfloat plane[4];
#else
GLdouble plane[4];
#endif
GLfloat angle;
CoglHandle draw_buffer = _cogl_get_draw_buffer ();
CoglMatrixStack *modelview_stack =
_cogl_draw_buffer_get_modelview_stack (draw_buffer);
CoglMatrixStack *projection_stack =
_cogl_draw_buffer_get_projection_stack (draw_buffer);
CoglMatrix inverse_projection;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_get_inverse (projection_stack, &inverse_projection);
/* Calculate the angle between the axes and the line crossing the
two points */
angle = atan2f (vertex_b[1] - vertex_a[1],
vertex_b[0] - vertex_a[0]) * (180.0/G_PI);
_cogl_matrix_stack_push (modelview_stack);
/* Load the inverse of the projection matrix so we can specify the plane
* in screen coordinates */
_cogl_matrix_stack_set (modelview_stack, &inverse_projection);
/* Rotate about point a */
_cogl_matrix_stack_translate (modelview_stack,
vertex_a[0], vertex_a[1], vertex_a[2]);
/* Rotate the plane by the calculated angle so that it will connect
the two points */
_cogl_matrix_stack_rotate (modelview_stack, angle, 0.0f, 0.0f, 1.0f);
_cogl_matrix_stack_translate (modelview_stack,
-vertex_a[0], -vertex_a[1], -vertex_a[2]);
_cogl_matrix_stack_flush_to_gl (modelview_stack, COGL_MATRIX_MODELVIEW);
plane[0] = 0;
plane[1] = -1.0;
plane[2] = 0;
plane[3] = vertex_a[1];
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
GE( glClipPlanef (plane_num, plane) );
#else
GE( glClipPlane (plane_num, plane) );
#endif
_cogl_matrix_stack_pop (modelview_stack);
}
static void
set_clip_planes (float x_offset,
float y_offset,
float width,
float height)
{
CoglHandle draw_buffer = _cogl_get_draw_buffer ();
CoglMatrixStack *modelview_stack =
_cogl_draw_buffer_get_modelview_stack (draw_buffer);
CoglMatrix modelview_matrix;
CoglMatrixStack *projection_stack =
_cogl_draw_buffer_get_projection_stack (draw_buffer);
CoglMatrix projection_matrix;
float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
float vertex_br[4] = { x_offset + width, y_offset + height,
0, 1.0 };
_cogl_matrix_stack_get (projection_stack, &projection_matrix);
_cogl_matrix_stack_get (modelview_stack, &modelview_matrix);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
/* If the order of the top and bottom lines is different from the
order of the left and right lines then the clip rect must have
been transformed so that the back is visible. We therefore need
to swap one pair of vertices otherwise all of the planes will be
the wrong way around */
if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0)
!= (vertex_bl[1] < vertex_tl[1] ? 1 : 0))
{
float temp[4];
memcpy (temp, vertex_tl, sizeof (temp));
memcpy (vertex_tl, vertex_tr, sizeof (temp));
memcpy (vertex_tr, temp, sizeof (temp));
memcpy (temp, vertex_bl, sizeof (temp));
memcpy (vertex_bl, vertex_br, sizeof (temp));
memcpy (vertex_br, temp, sizeof (temp));
}
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
add_stencil_clip_rectangle (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);
}
static void
disable_stencil_buffer (void)
{
GE( glDisable (GL_STENCIL_TEST) );
}
static void
enable_clip_planes (void)
{
GE( glEnable (GL_CLIP_PLANE0) );
GE( glEnable (GL_CLIP_PLANE1) );
GE( glEnable (GL_CLIP_PLANE2) );
GE( glEnable (GL_CLIP_PLANE3) );
}
static void
disable_clip_planes (void)
{
GE( glDisable (GL_CLIP_PLANE3) );
GE( glDisable (GL_CLIP_PLANE2) );
GE( glDisable (GL_CLIP_PLANE1) );
GE( glDisable (GL_CLIP_PLANE0) );
}
/* FIXME: deprecate and replace with:
* void
* cogl_clip_push_window_rectangle (int x_offset,
@ -436,8 +659,8 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
clip_state->stencil_used = FALSE;
_cogl_disable_clip_planes ();
_cogl_disable_stencil_buffer ();
disable_clip_planes ();
disable_stencil_buffer ();
GE (glDisable (GL_SCISSOR_TEST));
/* If the stack is empty then there's nothing else to do */
@ -484,21 +707,21 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
that instead */
if (has_clip_planes)
{
_cogl_set_clip_planes (rect->x_offset,
rect->y_offset,
rect->width,
rect->height);
set_clip_planes (rect->x_offset,
rect->y_offset,
rect->width,
rect->height);
using_clip_planes = TRUE;
/* We can't use clip planes a second time */
has_clip_planes = FALSE;
}
else
{
_cogl_add_stencil_clip (rect->x_offset,
rect->y_offset,
rect->width,
rect->height,
!using_stencil_buffer);
add_stencil_clip_rectangle (rect->x_offset,
rect->y_offset,
rect->width,
rect->height,
!using_stencil_buffer);
using_stencil_buffer = TRUE;
}
@ -519,7 +742,7 @@ _cogl_flush_clip_state (CoglClipStackState *clip_state)
/* Enabling clip planes is delayed to now so that they won't affect
setting up the stencil buffer */
if (using_clip_planes)
_cogl_enable_clip_planes ();
enable_clip_planes ();
if (scissor_x0 >= scissor_x1 || scissor_y0 >= scissor_y1)
scissor_x0 = scissor_y0 = scissor_x1 = scissor_y1 = 0;

237
cogl/cogl.c
View File

@ -337,243 +337,6 @@ cogl_set_source_color (const CoglColor *color)
cogl_set_source (ctx->default_material);
}
static void
project_vertex (const CoglMatrix *modelview_matrix,
const CoglMatrix *projection_matrix,
float *vertex)
{
int i;
/* Apply the modelview matrix */
cogl_matrix_transform_point (modelview_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Apply the projection matrix */
cogl_matrix_transform_point (projection_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Convert from homogenized coordinates */
for (i = 0; i < 4; i++)
vertex[i] /= vertex[3];
}
static void
set_clip_plane (GLint plane_num,
const float *vertex_a,
const float *vertex_b)
{
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
GLfloat plane[4];
#else
GLdouble plane[4];
#endif
GLfloat angle;
CoglHandle draw_buffer = _cogl_get_draw_buffer ();
CoglMatrixStack *modelview_stack =
_cogl_draw_buffer_get_modelview_stack (draw_buffer);
CoglMatrixStack *projection_stack =
_cogl_draw_buffer_get_projection_stack (draw_buffer);
CoglMatrix inverse_projection;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_get_inverse (projection_stack, &inverse_projection);
/* Calculate the angle between the axes and the line crossing the
two points */
angle = atan2f (vertex_b[1] - vertex_a[1],
vertex_b[0] - vertex_a[0]) * (180.0/G_PI);
_cogl_matrix_stack_push (modelview_stack);
/* Load the inverse of the projection matrix so we can specify the plane
* in screen coordinates */
_cogl_matrix_stack_set (modelview_stack, &inverse_projection);
/* Rotate about point a */
_cogl_matrix_stack_translate (modelview_stack,
vertex_a[0], vertex_a[1], vertex_a[2]);
/* Rotate the plane by the calculated angle so that it will connect
the two points */
_cogl_matrix_stack_rotate (modelview_stack, angle, 0.0f, 0.0f, 1.0f);
_cogl_matrix_stack_translate (modelview_stack,
-vertex_a[0], -vertex_a[1], -vertex_a[2]);
_cogl_matrix_stack_flush_to_gl (modelview_stack, COGL_MATRIX_MODELVIEW);
plane[0] = 0;
plane[1] = -1.0;
plane[2] = 0;
plane[3] = vertex_a[1];
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
GE( glClipPlanef (plane_num, plane) );
#else
GE( glClipPlane (plane_num, plane) );
#endif
_cogl_matrix_stack_pop (modelview_stack);
}
void
_cogl_set_clip_planes (float x_offset,
float y_offset,
float width,
float height)
{
CoglHandle draw_buffer = _cogl_get_draw_buffer ();
CoglMatrixStack *modelview_stack =
_cogl_draw_buffer_get_modelview_stack (draw_buffer);
CoglMatrix modelview_matrix;
CoglMatrixStack *projection_stack =
_cogl_draw_buffer_get_projection_stack (draw_buffer);
CoglMatrix projection_matrix;
float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
float vertex_br[4] = { x_offset + width, y_offset + height,
0, 1.0 };
_cogl_matrix_stack_get (projection_stack, &projection_matrix);
_cogl_matrix_stack_get (modelview_stack, &modelview_matrix);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
/* If the order of the top and bottom lines is different from the
order of the left and right lines then the clip rect must have
been transformed so that the back is visible. We therefore need
to swap one pair of vertices otherwise all of the planes will be
the wrong way around */
if ((vertex_tl[0] < vertex_tr[0] ? 1 : 0)
!= (vertex_bl[1] < vertex_tl[1] ? 1 : 0))
{
float temp[4];
memcpy (temp, vertex_tl, sizeof (temp));
memcpy (vertex_tl, vertex_tr, sizeof (temp));
memcpy (vertex_tr, temp, sizeof (temp));
memcpy (temp, vertex_bl, sizeof (temp));
memcpy (vertex_bl, vertex_br, sizeof (temp));
memcpy (vertex_br, temp, sizeof (temp));
}
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,