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mutter/clutter/cogl/gl/cogl.c
Emmanuele Bassi 99acb8e9c1 2007-11-21 Emmanuele Bassi <ebassi@openedhand.com> 
* clutter/cogl/cogl.h: Add cogl_fog_set() abstracting the
	glFog() functions and enabling the GL_FOG flag.

	* clutter/cogl/gl/cogl.c: Add GL implementation of cogl_fog_set().
	
	* clutter/cogl/gles/cogl.c: Add GL/ES implementation of
	cogl_fog_set().

	* clutter.symbols: Add new symbols.

	* clutter/clutter-stage.h: Add API to enable depth cueing on
	the stage using a linear GL fog, and to set the parameters
	for it (#637).

	* clutter/clutter-stage.c (clutter_stage_paint): Enable the
	GL fog if the ClutterStage:use-fog property is true.

	* tests/test-depth.c: Test the new stage API.
2007-11-21 11:55:26 +00:00

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/*
* Clutter COGL
*
* A basic GL/GLES Abstraction/Utility Layer
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 OpenedHand
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include <string.h>
#ifdef HAVE_CLUTTER_GLX
#include <dlfcn.h>
#include <GL/glx.h>
typedef CoglFuncPtr (*GLXGetProcAddressProc) (const guint8 *procName);
#endif
static gulong __enable_flags = 0;
#if COGL_DEBUG
struct token_string
{
GLuint Token;
const char *String;
};
static const struct token_string Errors[] = {
{ GL_NO_ERROR, "no error" },
{ GL_INVALID_ENUM, "invalid enumerant" },
{ GL_INVALID_VALUE, "invalid value" },
{ GL_INVALID_OPERATION, "invalid operation" },
{ GL_STACK_OVERFLOW, "stack overflow" },
{ GL_STACK_UNDERFLOW, "stack underflow" },
{ GL_OUT_OF_MEMORY, "out of memory" },
#ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
{ GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "invalid framebuffer operation" },
#endif
{ ~0, NULL }
};
static const char*
error_string(GLenum errorCode)
{
int i;
for (i = 0; Errors[i].String; i++) {
if (Errors[i].Token == errorCode)
return Errors[i].String;
}
return "unknown";
}
#endif
#if COGL_DEBUG
#define GE(x...) G_STMT_START { \
GLenum err; \
(x); \
while ((err = glGetError()) != GL_NO_ERROR) { \
fprintf(stderr, "glError: %s caught at %s:%u\n", \
(char *)error_string(err), \
__FILE__, __LINE__); \
} \
} G_STMT_END
#else
#define GE(x) (x);
#endif
CoglFuncPtr
cogl_get_proc_address (const gchar* name)
{
/* Sucks to ifdef here but not other option..? would be nice to
* split the code up for more reuse (once more backends use this
*/
#ifdef HAVE_CLUTTER_GLX
static GLXGetProcAddressProc get_proc_func = NULL;
static void *dlhand = NULL;
if (get_proc_func == NULL && dlhand == NULL)
{
dlhand = dlopen (NULL, RTLD_LAZY);
if (dlhand)
{
dlerror ();
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddress");
if (dlerror () != NULL)
{
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddressARB");
}
if (dlerror () != NULL)
{
get_proc_func = NULL;
g_warning ("failed to bind GLXGetProcAddress "
"or GLXGetProcAddressARB");
}
}
}
if (get_proc_func)
return get_proc_func ((unsigned char*) name);
#endif
return NULL;
}
gboolean
cogl_check_extension (const gchar *name, const gchar *ext)
{
gchar *end;
gint name_len, n;
if (name == NULL || ext == NULL)
return FALSE;
end = (gchar*)(ext + strlen(ext));
name_len = strlen(name);
while (ext < end)
{
n = strcspn(ext, " ");
if ((name_len == n) && (!strncmp(name, ext, n)))
return TRUE;
ext += (n + 1);
}
return FALSE;
}
void
cogl_paint_init (const ClutterColor *color)
{
GE( glClearColor (((float) color->red / 0xff * 1.0),
((float) color->green / 0xff * 1.0),
((float) color->blue / 0xff * 1.0),
0.0) );
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glDisable (GL_LIGHTING);
glDisable (GL_FOG);
glEnable (GL_DEPTH_TEST);
glDepthFunc (GL_LEQUAL);
cogl_enable (CGL_ENABLE_BLEND);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
/* FIXME: inline most of these */
void
cogl_push_matrix (void)
{
glPushMatrix();
}
void
cogl_pop_matrix (void)
{
glPopMatrix();
}
void
cogl_scale (ClutterFixed x, ClutterFixed y)
{
glScaled (CLUTTER_FIXED_TO_DOUBLE (x),
CLUTTER_FIXED_TO_DOUBLE (y),
1.0);
}
void
cogl_translatex (ClutterFixed x, ClutterFixed y, ClutterFixed z)
{
glTranslated (CLUTTER_FIXED_TO_DOUBLE (x),
CLUTTER_FIXED_TO_DOUBLE (y),
CLUTTER_FIXED_TO_DOUBLE (z));
}
void
cogl_translate (gint x, gint y, gint z)
{
glTranslatef ((float)x, (float)y, (float)z);
}
void
cogl_rotatex (ClutterFixed angle, gint x, gint y, gint z)
{
glRotated (CLUTTER_FIXED_TO_DOUBLE (angle),
CLUTTER_FIXED_TO_DOUBLE (x),
CLUTTER_FIXED_TO_DOUBLE (y),
CLUTTER_FIXED_TO_DOUBLE (z));
}
void
cogl_rotate (gint angle, gint x, gint y, gint z)
{
glRotatef ((float)angle, (float)x, (float)y, (float)z);
}
void
cogl_enable (gulong flags)
{
/* This function essentially caches glEnable state() in the
* hope of lessening number GL traffic.
*/
if (flags & CGL_ENABLE_BLEND)
{
if (!(__enable_flags & CGL_ENABLE_BLEND))
{
glEnable (GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
__enable_flags |= CGL_ENABLE_BLEND;
}
}
else if (__enable_flags & CGL_ENABLE_BLEND)
{
glDisable (GL_BLEND);
__enable_flags &= ~CGL_ENABLE_BLEND;
}
if (flags & CGL_ENABLE_TEXTURE_2D)
{
if (!(__enable_flags & CGL_ENABLE_TEXTURE_2D))
{
glEnable (GL_TEXTURE_2D);
__enable_flags |= CGL_ENABLE_TEXTURE_2D;
}
}
else if (__enable_flags & CGL_ENABLE_TEXTURE_2D)
{
glDisable (GL_TEXTURE_2D);
__enable_flags &= ~CGL_ENABLE_TEXTURE_2D;
}
#ifdef GL_TEXTURE_RECTANGLE_ARB
if (flags & CGL_ENABLE_TEXTURE_RECT)
{
if (!(__enable_flags & CGL_ENABLE_TEXTURE_RECT))
{
glEnable (GL_TEXTURE_RECTANGLE_ARB);
__enable_flags |= CGL_ENABLE_TEXTURE_RECT;
}
}
else if (__enable_flags & CGL_ENABLE_TEXTURE_RECT)
{
glDisable (GL_TEXTURE_RECTANGLE_ARB);
__enable_flags &= ~CGL_ENABLE_TEXTURE_RECT;
}
#endif
if (flags & CGL_ENABLE_ALPHA_TEST)
{
if (!(__enable_flags & CGL_ENABLE_ALPHA_TEST))
{
glEnable (GL_ALPHA_TEST);
__enable_flags |= CGL_ENABLE_ALPHA_TEST;
}
}
else if (__enable_flags & CGL_ENABLE_ALPHA_TEST)
{
glDisable (GL_ALPHA_TEST);
__enable_flags &= ~CGL_ENABLE_ALPHA_TEST;
}
}
void
cogl_color (const ClutterColor *color)
{
glColor4ub (color->red, color->green, color->blue, color->alpha);
}
void
cogl_clip_set (const ClutterGeometry *clip)
{
GE( glEnable (GL_STENCIL_TEST) );
GE( glClearStencil (0.0f) );
GE( glClear (GL_STENCIL_BUFFER_BIT) );
GE( glStencilFunc (GL_NEVER, 0x1, 0x1) );
GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) );
GE( glColor3f (1.0f, 1.0f, 1.0f) );
GE( glRecti (clip->x,
clip->y,
clip->x + clip->width,
clip->y + clip->height) );
GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
; GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
}
void
cogl_clip_unset (void)
{
GE( glDisable (GL_STENCIL_TEST) );
}
gboolean
cogl_texture_can_size (COGLenum target,
COGLenum pixel_format,
COGLenum pixel_type,
int width,
int height)
{
#ifdef GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB
if (target == CGL_TEXTURE_RECTANGLE_ARB)
{
GLint max_size = 0;
GE( glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB, &max_size) );
return (max_size && width <= max_size && height <= max_size);
}
else /* Assumes CGL_TEXTURE_2D */
#endif
{
GLint new_width = 0;
GE( glTexImage2D (GL_PROXY_TEXTURE_2D, 0, GL_RGBA,
width, height, 0 /* border */,
pixel_format, pixel_type, NULL) );
GE( glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
}
void
cogl_texture_quad (gint x1,
gint x2,
gint y1,
gint y2,
ClutterFixed tx1,
ClutterFixed ty1,
ClutterFixed tx2,
ClutterFixed ty2)
{
gdouble txf1, tyf1, txf2, tyf2;
txf1 = CLUTTER_FIXED_TO_DOUBLE (tx1);
tyf1 = CLUTTER_FIXED_TO_DOUBLE (ty1);
txf2 = CLUTTER_FIXED_TO_DOUBLE (tx2);
tyf2 = CLUTTER_FIXED_TO_DOUBLE (ty2);
glBegin (GL_QUADS);
glTexCoord2f (txf2, tyf2); glVertex2i (x2, y2);
glTexCoord2f (txf1, tyf2); glVertex2i (x1, y2);
glTexCoord2f (txf1, tyf1); glVertex2i (x1, y1);
glTexCoord2f (txf2, tyf1); glVertex2i (x2, y1);
glEnd ();
}
void
cogl_textures_create (guint num, COGLuint *textures)
{
GE( glGenTextures (num, textures) );
}
void
cogl_textures_destroy (guint num, const COGLuint *textures)
{
GE( glDeleteTextures (num, textures) );
}
void
cogl_texture_bind (COGLenum target, COGLuint texture)
{
GE( glBindTexture (target, texture) );
}
void
cogl_texture_set_alignment (COGLenum target,
guint alignment,
guint row_length)
{
GE( glPixelStorei (GL_UNPACK_ROW_LENGTH, row_length) );
GE( glPixelStorei (GL_UNPACK_ALIGNMENT, alignment) );
}
void
cogl_texture_set_filters (COGLenum target,
COGLenum min_filter,
COGLenum max_filter)
{
GE( glTexParameteri(target, GL_TEXTURE_MAG_FILTER, max_filter) );
GE( glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filter) );
}
void
cogl_texture_set_wrap (COGLenum target,
COGLenum wrap_s,
COGLenum wrap_t)
{
GE( glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap_s) );
GE( glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap_s) );
}
void
cogl_texture_image_2d (COGLenum target,
COGLint internal_format,
gint width,
gint height,
COGLenum format,
COGLenum type,
const guchar* pixels)
{
GE( glTexImage2D (target,
0, /* No mipmap support as yet */
internal_format,
width,
height,
0, /* 0 pixel border */
format,
type,
pixels) );
}
void
cogl_texture_sub_image_2d (COGLenum target,
gint xoff,
gint yoff,
gint width,
gint height,
COGLenum format,
COGLenum type,
const guchar* pixels)
{
GE( glTexSubImage2D (target,
0,
xoff,
yoff,
width,
height,
format,
type,
pixels));
}
void
cogl_rectangle (gint x, gint y, guint width, guint height)
{
GE( glRecti (x, y, x + width, y + height) );
}
/* FIXME: Should use ClutterReal or Fixed */
void
cogl_trapezoid (gint y1,
gint x11,
gint x21,
gint y2,
gint x12,
gint x22)
{
GE( glBegin (GL_QUADS) );
GE( glVertex2i (x11, y1) );
GE( glVertex2i (x21, y1) );
GE( glVertex2i (x22, y2) );
GE( glVertex2i (x12, y2) );
GE( glEnd () );
}
void
cogl_alpha_func (COGLenum func,
ClutterFixed ref)
{
GE( glAlphaFunc (func, CLUTTER_FIXED_TO_FLOAT(ref)) );
}
void
cogl_perspective (ClutterFixed fovy,
ClutterFixed aspect,
ClutterFixed zNear,
ClutterFixed zFar)
{
ClutterFixed xmax, ymax;
ClutterFixed x, y, c, d;
ClutterFixed fovy_rad_half = CLUTTER_FIXED_MUL (fovy, CFX_PI) / 360;
GLfloat m[16];
memset (&m[0], 0, sizeof (m));
/*
* Based on the original algorithm in perspective():
*
* 1) xmin = -xmax => xmax + xmin == 0 && xmax - xmin == 2 * xmax
* same true for y, hence: a == 0 && b == 0;
*
* 2) When working with small numbers, we are loosing significant
* precision, hence we use clutter_qmulx() here, not the fast macro.
*/
ymax = clutter_qmulx (zNear, CLUTTER_FIXED_DIV (clutter_sinx (fovy_rad_half),
clutter_cosx (fovy_rad_half)));
xmax = clutter_qmulx (ymax, aspect);
x = CLUTTER_FIXED_DIV (zNear, xmax);
y = CLUTTER_FIXED_DIV (zNear, ymax);
c = CLUTTER_FIXED_DIV (-(zFar + zNear), ( zFar - zNear));
d = CLUTTER_FIXED_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear));
#define M(row,col) m[col*4+row]
M(0,0) = CLUTTER_FIXED_TO_FLOAT (x);
M(1,1) = CLUTTER_FIXED_TO_FLOAT (y);
M(2,2) = CLUTTER_FIXED_TO_FLOAT (c);
M(2,3) = CLUTTER_FIXED_TO_FLOAT (d);
M(3,2) = -1.0F;
GE( glMultMatrixf (m) );
#undef M
}
void
cogl_setup_viewport (guint width,
guint height,
ClutterFixed fovy,
ClutterFixed aspect,
ClutterFixed z_near,
ClutterFixed z_far)
{
GLfloat z_camera;
GE( glViewport (0, 0, width, height) );
GE( glMatrixMode (GL_PROJECTION) );
GE( glLoadIdentity () );
cogl_perspective (fovy, aspect, z_near, z_far);
GE( glMatrixMode (GL_MODELVIEW) );
GE( glLoadIdentity () );
/*
* camera distance from screen, 0.5 * tan (FOV)
*
* We have been having some problems with this; the theoretically correct
* value of 0.866025404f for the default 60 deg fovy angle happens to be
* touch to small in reality, which on full-screen stage with an actor of
* the same size results in about 1px on the left and top edges of the
* actor being offscreen. Perhaps more significantly, it also causes
* hinting artifacts when rendering text.
*
* So for the default 60 deg angle we worked out that the value of 0.869
* is giving correct stretch and no noticeable artifacts on text. Seems
* good on all drivers too.
*/
#define DEFAULT_Z_CAMERA 0.869f
z_camera = DEFAULT_Z_CAMERA;
if (fovy != CFX_60)
{
ClutterFixed fovy_rad = CFX_MUL (fovy, CFX_PI) / 180;
z_camera =
CLUTTER_FIXED_TO_FLOAT (CFX_DIV (clutter_sinx (fovy_rad),
clutter_cosx (fovy_rad)) >> 1);
}
GE( glTranslatef (-0.5f, -0.5f, -z_camera) );
GE( glScalef ( 1.0f / width,
-1.0f / height,
1.0f / width) );
GE( glTranslatef (0.0f, -1.0 * height, 0.0f) );
}
ClutterFeatureFlags
cogl_get_features ()
{
ClutterFeatureFlags flags = 0;
const gchar *gl_extensions;
flags = CLUTTER_FEATURE_TEXTURE_READ_PIXELS;
gl_extensions = (const gchar*) glGetString (GL_EXTENSIONS);
#if defined(GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB) && defined(GL_TEXTURE_RECTANGLE_ARB)
if (cogl_check_extension ("GL_ARB_texture_rectangle", gl_extensions) ||
cogl_check_extension ("GL_EXT_texture_rectangle", gl_extensions))
{
flags |= CLUTTER_FEATURE_TEXTURE_RECTANGLE;
}
#endif
#ifdef GL_YCBCR_MESA
if (cogl_check_extension ("GL_MESA_ycbcr_texture", gl_extensions))
{
flags |= CLUTTER_FEATURE_TEXTURE_YUV;
}
#endif
return flags;
}
void
cogl_get_modelview_matrix (ClutterFixed m[16])
{
GLdouble md[16];
glGetDoublev(GL_MODELVIEW_MATRIX, &md[0]);
#define M(m,row,col) m[col*4+row]
M(m,0,0) = CLUTTER_FLOAT_TO_FIXED (M(md,0,0));
M(m,0,1) = CLUTTER_FLOAT_TO_FIXED (M(md,0,1));
M(m,0,2) = CLUTTER_FLOAT_TO_FIXED (M(md,0,2));
M(m,0,3) = CLUTTER_FLOAT_TO_FIXED (M(md,0,3));
M(m,1,0) = CLUTTER_FLOAT_TO_FIXED (M(md,1,0));
M(m,1,1) = CLUTTER_FLOAT_TO_FIXED (M(md,1,1));
M(m,1,2) = CLUTTER_FLOAT_TO_FIXED (M(md,1,2));
M(m,1,3) = CLUTTER_FLOAT_TO_FIXED (M(md,1,3));
M(m,2,0) = CLUTTER_FLOAT_TO_FIXED (M(md,2,0));
M(m,2,1) = CLUTTER_FLOAT_TO_FIXED (M(md,2,1));
M(m,2,2) = CLUTTER_FLOAT_TO_FIXED (M(md,2,2));
M(m,2,3) = CLUTTER_FLOAT_TO_FIXED (M(md,2,3));
M(m,3,0) = CLUTTER_FLOAT_TO_FIXED (M(md,3,0));
M(m,3,1) = CLUTTER_FLOAT_TO_FIXED (M(md,3,1));
M(m,3,2) = CLUTTER_FLOAT_TO_FIXED (M(md,3,2));
M(m,3,3) = CLUTTER_FLOAT_TO_FIXED (M(md,3,3));
#undef M
}
void
cogl_get_projection_matrix (ClutterFixed m[16])
{
GLdouble md[16];
glGetDoublev(GL_PROJECTION_MATRIX, &md[0]);
#define M(m,row,col) m[col*4+row]
M(m,0,0) = CLUTTER_FLOAT_TO_FIXED (M(md,0,0));
M(m,0,1) = CLUTTER_FLOAT_TO_FIXED (M(md,0,1));
M(m,0,2) = CLUTTER_FLOAT_TO_FIXED (M(md,0,2));
M(m,0,3) = CLUTTER_FLOAT_TO_FIXED (M(md,0,3));
M(m,1,0) = CLUTTER_FLOAT_TO_FIXED (M(md,1,0));
M(m,1,1) = CLUTTER_FLOAT_TO_FIXED (M(md,1,1));
M(m,1,2) = CLUTTER_FLOAT_TO_FIXED (M(md,1,2));
M(m,1,3) = CLUTTER_FLOAT_TO_FIXED (M(md,1,3));
M(m,2,0) = CLUTTER_FLOAT_TO_FIXED (M(md,2,0));
M(m,2,1) = CLUTTER_FLOAT_TO_FIXED (M(md,2,1));
M(m,2,2) = CLUTTER_FLOAT_TO_FIXED (M(md,2,2));
M(m,2,3) = CLUTTER_FLOAT_TO_FIXED (M(md,2,3));
M(m,3,0) = CLUTTER_FLOAT_TO_FIXED (M(md,3,0));
M(m,3,1) = CLUTTER_FLOAT_TO_FIXED (M(md,3,1));
M(m,3,2) = CLUTTER_FLOAT_TO_FIXED (M(md,3,2));
M(m,3,3) = CLUTTER_FLOAT_TO_FIXED (M(md,3,3));
#undef M
}
void
cogl_get_viewport (ClutterFixed v[4])
{
GLdouble vd[4];
glGetDoublev(GL_VIEWPORT, &vd[0]);
v[0] = CLUTTER_FLOAT_TO_FIXED (vd[0]);
v[1] = CLUTTER_FLOAT_TO_FIXED (vd[1]);
v[2] = CLUTTER_FLOAT_TO_FIXED (vd[2]);
v[3] = CLUTTER_FLOAT_TO_FIXED (vd[3]);
}
void
cogl_get_bitmasks (gint *red, gint *green, gint *blue, gint *alpha)
{
GLint value;
if (red)
{
GE( glGetIntegerv(GL_RED_BITS, &value) );
*red = value;
}
if (green)
{
GE( glGetIntegerv(GL_GREEN_BITS, &value) );
*green = value;
}
if (blue)
{
GE( glGetIntegerv(GL_BLUE_BITS, &value) );
*blue = value;
}
if (alpha)
{
GE( glGetIntegerv(GL_ALPHA_BITS, &value ) );
*alpha = value;
}
}
void
cogl_fog_set (const ClutterColor *fog_color,
ClutterFixed density,
ClutterFixed start,
ClutterFixed stop)
{
GLfloat fogColor[4];
fogColor[0] = ((float) fog_color->red / 0xff * 1.0);
fogColor[1] = ((float) fog_color->green / 0xff * 1.0);
fogColor[2] = ((float) fog_color->blue / 0xff * 1.0);
fogColor[3] = ((float) fog_color->alpha / 0xff * 1.0);
glEnable (GL_FOG);
glFogfv (GL_FOG_COLOR, fogColor);
glFogi (GL_FOG_MODE, GL_LINEAR);
glHint (GL_FOG_HINT, GL_NICEST);
glFogf (GL_FOG_DENSITY, CLUTTER_FIXED_TO_FLOAT (density));
glFogf (GL_FOG_START, CLUTTER_FIXED_TO_FLOAT (start));
glFogf (GL_FOG_END, CLUTTER_FIXED_TO_FLOAT (stop));
}
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