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mutter-performance-source/cogl/cogl-current-matrix.c
Robert Bragg 0bce7eac53 Intial Re-layout of the Cogl source code and introduction of a Cogl Winsys 
As part of an incremental process to have Cogl be a standalone project we
want to re-consider how we organise the Cogl source code.

Currently this is the structure I'm aiming for:
cogl/
    cogl/
	<put common source here>
	winsys/
	   cogl-glx.c
	   cogl-wgl.c
	driver/
	    gl/
	    gles/
	os/ ?
    utils/
	cogl-fixed
	cogl-matrix-stack?
        cogl-journal?
        cogl-primitives?
    pango/

The new winsys component is a starting point for migrating window system
code (i.e.  x11,glx,wgl,osx,egl etc) from Clutter to Cogl.

The utils/ and pango/ directories aren't added by this commit, but they are
noted because I plan to add them soon.

Overview of the planned structure:

* The winsys/ API is the API that binds OpenGL to a specific window system,
  be that X11 or win32 etc.  Example are glx, wgl and egl. Much of the logic
  under clutter/{glx,osx,win32 etc} should migrate here.

* Note there is also the idea of a winsys-base that may represent a window
  system for which there are multiple winsys APIs.  An example of this is
  x11, since glx and egl may both be used with x11.  (currently only Clutter
  has the idea of a winsys-base)

* The driver/ represents a specific varient of OpenGL. Currently we have "gl"
  representing OpenGL 1.4-2.1 (mostly fixed function) and "gles" representing
  GLES 1.1 (fixed funciton) and 2.0 (fully shader based)

* Everything under cogl/ should fundamentally be supporting access to the
  GPU.  Essentially Cogl's most basic requirement is to provide a nice GPU
  Graphics API and drawing a line between this and the utility functionality
  we add to support Clutter should help keep this lean and maintainable.

* Code under utils/ as suggested builds on cogl/ adding more convenient
  APIs or mechanism to optimize special cases. Broadly speaking you can
  compare cogl/ to OpenGL and utils/ to GLU.

* clutter/pango will be moved to clutter/cogl/pango

How some of the internal configure.ac/pkg-config terminology has changed:
backendextra -> CLUTTER_WINSYS_BASE # e.g. "x11"
backendextralib -> CLUTTER_WINSYS_BASE_LIB # e.g. "x11/libclutter-x11.la"
clutterbackend -> {CLUTTER,COGL}_WINSYS # e.g. "glx"
CLUTTER_FLAVOUR -> {CLUTTER,COGL}_WINSYS
clutterbackendlib -> CLUTTER_WINSYS_LIB
CLUTTER_COGL -> COGL_DRIVER # e.g. "gl"

Note: The CLUTTER_FLAVOUR and CLUTTER_COGL defines are kept for apps

As the first thing to take advantage of the new winsys component in Cogl;
cogl_get_proc_address() has been moved from cogl/{gl,gles}/cogl.c into
cogl/common/cogl.c and this common implementation first trys
_cogl_winsys_get_proc_address() but if that fails then it falls back to
gmodule.
2009-10-16 18:58:50 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors:
* Havoc Pennington <hp@pobox.com> for litl
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-context.h"
#include "cogl-internal.h"
#include "cogl-current-matrix.h"
#include "cogl-matrix-stack.h"
#ifdef HAVE_COGL_GLES2
#include "cogl-gles2-wrapper.h"
#define glFrustum(L,R,B,T,N,F) \
cogl_wrap_glFrustumf((GLfloat)L, (GLfloat)R, (GLfloat)B, \
(GLfloat)T, (GLfloat)N, (GLfloat)F)
#elif defined (HAVE_COGL_GLES)
#define glFrustum(L,R,B,T,N,F) \
glFrustumf((GLfloat)L, (GLfloat)R, (GLfloat)B, \
(GLfloat)T, (GLfloat)N, (GLfloat)F)
#define glOrtho glOrthof
#endif
#include <string.h>
#include <math.h>
static void
_cogl_get_client_stack (CoglContext *ctx,
CoglMatrixMode mode,
CoglMatrixStack **current_stack_p)
{
if (ctx->modelview_stack &&
mode == COGL_MATRIX_MODELVIEW)
*current_stack_p = ctx->modelview_stack;
else if (ctx->projection_stack &&
mode == COGL_MATRIX_PROJECTION)
*current_stack_p = ctx->projection_stack;
else
*current_stack_p = NULL;
}
#define _COGL_GET_CONTEXT_AND_STACK(contextvar, stackvar, rval) \
CoglMatrixStack *stackvar; \
_COGL_GET_CONTEXT (contextvar, rval); \
_cogl_get_client_stack (contextvar, ctx->matrix_mode, &stackvar)
void
_cogl_set_current_matrix (CoglMatrixMode mode)
{
GLenum gl_mode;
CoglMatrixStack *current_stack; \
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (mode == ctx->matrix_mode)
return;
ctx->matrix_mode = mode;
/* If we have a client side stack then then the GL matrix mode only needs
* changing when we come to flush it to OpenGL */
_cogl_get_client_stack (ctx, mode, &current_stack);
if (current_stack)
return;
gl_mode = 0; /* silence compiler warning */
switch (mode)
{
case COGL_MATRIX_MODELVIEW:
gl_mode = GL_MODELVIEW;
break;
case COGL_MATRIX_PROJECTION:
gl_mode = GL_PROJECTION;
break;
case COGL_MATRIX_TEXTURE:
gl_mode = GL_TEXTURE;
break;
}
GE (glMatrixMode (gl_mode));
}
void
_cogl_current_matrix_push (void)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_push (current_stack);
else
GE (glPushMatrix ());
}
void
_cogl_current_matrix_pop (void)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_pop (current_stack);
else
GE (glPopMatrix ());
}
void
_cogl_current_matrix_identity (void)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_load_identity (current_stack);
else
GE (glLoadIdentity ());
}
void
_cogl_current_matrix_load (const CoglMatrix *matrix)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_set (current_stack, matrix);
else
GE (glLoadMatrixf (cogl_matrix_get_array (matrix)));
}
void
_cogl_current_matrix_multiply (const CoglMatrix *matrix)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_multiply (current_stack, matrix);
else
GE (glMultMatrixf (cogl_matrix_get_array (matrix)));
}
void
_cogl_current_matrix_rotate (float angle,
float x,
float y,
float z)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_rotate (current_stack, angle, x, y, z);
else
GE (glRotatef (angle, x, y, z));
}
void
_cogl_current_matrix_scale (float x,
float y,
float z)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_scale (current_stack, x, y, z);
else
GE (glScalef (x, y, z));
}
void
_cogl_current_matrix_translate (float x,
float y,
float z)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_translate (current_stack, x, y, z);
else
GE (glTranslatef (x, y, z));
}
void
_cogl_current_matrix_frustum (float left,
float right,
float bottom,
float top,
float near_val,
float far_val)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_frustum (current_stack,
left, right,
bottom, top,
near_val,
far_val);
else
GE (glFrustum (left, right, bottom, top, near_val, far_val));
}
void
_cogl_current_matrix_perspective (float fov_y,
float aspect,
float z_near,
float z_far)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_perspective (current_stack,
fov_y, aspect, z_near, z_far);
else
{
/* NB: There is no glPerspective() (only gluPerspective()) so we use
* cogl_matrix_perspective: */
CoglMatrix matrix;
_cogl_get_matrix (ctx->matrix_mode, &matrix);
cogl_matrix_perspective (&matrix,
fov_y, aspect, z_near, z_far);
_cogl_current_matrix_load (&matrix);
}
}
void
_cogl_current_matrix_ortho (float left,
float right,
float bottom,
float top,
float near_val,
float far_val)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack != NULL)
_cogl_matrix_stack_ortho (current_stack,
left, right,
bottom, top,
near_val,
far_val);
else
{
#ifdef HAVE_COGL_GLES2
/* NB: GLES 2 has no glOrtho(): */
CoglMatrix matrix;
_cogl_get_matrix (ctx->matrix_mode, &matrix);
cogl_matrix_ortho (&matrix,
left, right, bottom, top, near_val, far_val);
_cogl_current_matrix_load (&matrix);
#else
GE (glOrtho (left, right, bottom, top, near_val, far_val));
#endif
}
}
void
_cogl_get_matrix (CoglMatrixMode mode,
CoglMatrix *matrix)
{
CoglMatrixStack *current_stack;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_get_client_stack (ctx, mode, &current_stack);
if (current_stack)
_cogl_matrix_stack_get (current_stack, matrix);
else
{
GLenum gl_mode;
GLfloat gl_matrix[16];
gl_mode = 0; /* silence compiler warning */
switch (mode)
{
case COGL_MATRIX_MODELVIEW:
gl_mode = GL_MODELVIEW_MATRIX;
break;
case COGL_MATRIX_PROJECTION:
gl_mode = GL_PROJECTION_MATRIX;
break;
case COGL_MATRIX_TEXTURE:
gl_mode = GL_TEXTURE_MATRIX;
break;
}
/* Note: we have a redundant copy happening here. If that turns out to be
* a problem then, since this is internal to Cogl, we could pass the
* CoglMatrix pointer directly to glGetFloatv; the only problem with that
* is that if we later add internal flags to CoglMatrix they will need to
* be initialized seperatly.
*/
GE (glGetFloatv (gl_mode, gl_matrix));
cogl_matrix_init_from_array (matrix, gl_matrix);
}
}
void
_cogl_set_matrix (const CoglMatrix *matrix)
{
_cogl_current_matrix_load (matrix);
}
void
_cogl_current_matrix_state_init (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
ctx->matrix_mode = COGL_MATRIX_MODELVIEW;
ctx->modelview_stack = NULL;
ctx->projection_stack = NULL;
#if 0
if (ctx->indirect ||
cogl_debug_flags & COGL_DEBUG_FORCE_CLIENT_SIDE_MATRICES)
#endif
{
ctx->modelview_stack = _cogl_matrix_stack_new ();
ctx->projection_stack = _cogl_matrix_stack_new ();
}
}
void
_cogl_current_matrix_state_destroy (void)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack)
_cogl_matrix_stack_destroy (current_stack);
}
void
_cogl_current_matrix_state_flush (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->matrix_mode != COGL_MATRIX_MODELVIEW &&
ctx->matrix_mode != COGL_MATRIX_PROJECTION)
{
g_warning ("matrix state must be flushed in "
"MODELVIEW or PROJECTION mode");
return;
}
if (ctx->modelview_stack &&
ctx->matrix_mode == COGL_MATRIX_MODELVIEW)
{
_cogl_matrix_stack_flush_to_gl (ctx->modelview_stack,
GL_MODELVIEW);
}
else if (ctx->projection_stack &&
ctx->matrix_mode == COGL_MATRIX_PROJECTION)
{
_cogl_matrix_stack_flush_to_gl (ctx->projection_stack,
GL_PROJECTION);
}
}
void
_cogl_current_matrix_state_dirty (void)
{
_COGL_GET_CONTEXT_AND_STACK (ctx, current_stack, NO_RETVAL);
if (current_stack)
_cogl_matrix_stack_dirty (current_stack);
}
void
cogl_push_matrix (void)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_push ();
}
void
cogl_pop_matrix (void)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_pop ();
}
void
cogl_scale (float x, float y, float z)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_scale (x, y, z);
}
void
cogl_translate (float x, float y, float z)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_translate (x, y, z);
}
void
cogl_rotate (float angle, float x, float y, float z)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_rotate (angle, x, y, z);
}
void
cogl_perspective (float fov_y,
float aspect,
float z_near,
float z_far)
{
float ymax = z_near * tanf (fov_y * G_PI / 360.0);
cogl_frustum (-ymax * aspect, /* left */
ymax * aspect, /* right */
-ymax, /* bottom */
ymax, /* top */
z_near,
z_far);
}
void
cogl_frustum (float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
float c, d;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_identity ();
_cogl_current_matrix_frustum (left,
right,
bottom,
top,
z_near,
z_far);
/* Calculate and store the inverse of the matrix */
memset (ctx->inverse_projection, 0, sizeof (float) * 16);
c = - (z_far + z_near) / (z_far - z_near);
d = - (2 * (z_far * z_near)) / (z_far - z_near);
#define M(row,col) ctx->inverse_projection[col*4+row]
M(0,0) = (right - left) / (2 * z_near);
M(0,3) = (right + left) / (2 * z_near);
M(1,1) = (top - bottom) / (2 * z_near);
M(1,3) = (top + bottom) / (2 * z_near);
M(2,3) = -1.0;
M(3,2) = 1.0 / d;
M(3,3) = c / d;
#undef M
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
}
void
cogl_ortho (float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
CoglMatrix ortho;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_matrix_init_identity (&ortho);
cogl_matrix_ortho (&ortho, left, right, bottom, top, z_near, z_far);
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_load (&ortho);
/* Calculate and store the inverse of the matrix */
memset (ctx->inverse_projection, 0, sizeof (float) * 16);
#define M(row,col) ctx->inverse_projection[col*4+row]
M(0,0) = 1.0 / ortho.xx;
M(0,3) = -ortho.xw;
M(1,1) = 1.0 / ortho.yy;
M(1,3) = -ortho.yw;
M(2,2) = 1.0 / ortho.zz;
M(2,3) = -ortho.zw;
M(3,3) = 1.0;
#undef M
}
void
cogl_get_modelview_matrix (CoglMatrix *matrix)
{
_cogl_get_matrix (COGL_MATRIX_MODELVIEW,
matrix);
}
void
cogl_set_modelview_matrix (CoglMatrix *matrix)
{
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_load (matrix);
}
void
cogl_get_projection_matrix (CoglMatrix *matrix)
{
_cogl_get_matrix (COGL_MATRIX_PROJECTION,
matrix);
}
void
cogl_set_projection_matrix (CoglMatrix *matrix)
{
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_load (matrix);
}
void
_cogl_flush_matrix_stacks (void)
{
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_state_flush ();
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_state_flush ();
}
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