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Rename the third texure coordinate from 'r' to 'p'

Browse Source 
Using 'r' to name the third component is problematic because that is
commonly used to represent the red component of a vector representing
a color. Under GLSL this is awkward because the texture swizzling for
a vector uses a single letter for each component and the names for
colors, textures and positions are synonymous. GLSL works around this
by naming the components of the texture s, t, p and q. Cogl already
effectively already exposes this naming because it exposes GLSL so it
makes sense to use that naming consistently. Another alternative could
be u, v and w. This is what Blender and Direct3D use. However the w
component conflicts with the w component of a position vertex.
This commit is contained in:
Neil Roberts 2010-07-12 17:01:32 +01:00
parent cefc0e381b
commit 192cfa7a58
13 changed files with 65 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
clutter/cogl/cogl/cogl-atlas-texture.c
View File

@ -234,7 +234,7 @@ static void
_cogl_atlas_texture_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglAtlasTexture *atlas_tex = COGL_ATLAS_TEXTURE (tex);
@ -242,7 +242,7 @@ _cogl_atlas_texture_set_wrap_mode_parameters (CoglTexture *tex,
_cogl_texture_set_wrap_mode_parameters (atlas_tex->sub_texture,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
wrap_mode_p);
}
static void

8
clutter/cogl/cogl/cogl-material-private.h
View File

@ -337,7 +337,7 @@ struct _CoglMaterialLayer
CoglMaterialWrapMode wrap_mode_s;
CoglMaterialWrapMode wrap_mode_t;
CoglMaterialWrapMode wrap_mode_r;
CoglMaterialWrapMode wrap_mode_p;
/* Infrequent differences aren't currently tracked in
* a separate, dynamically allocated structure as they are
@ -756,7 +756,7 @@ typedef struct _CoglMaterialWrapModeOverrides
{
CoglMaterialWrapModeOverride s;
CoglMaterialWrapModeOverride t;
CoglMaterialWrapModeOverride r;
CoglMaterialWrapModeOverride p;
} values[COGL_MATERIAL_MAX_LAYERS];
} CoglMaterialWrapModeOverrides;
@ -817,12 +817,12 @@ _cogl_material_journal_unref (CoglMaterial *material);
/* TODO: These should be made public once we add support for 3D
textures in Cogl */
void
_cogl_material_set_layer_wrap_mode_r (CoglMaterial *material,
_cogl_material_set_layer_wrap_mode_p (CoglMaterial *material,
int layer_index,
CoglMaterialWrapMode mode);
CoglMaterialWrapMode
_cogl_material_layer_get_wrap_mode_r (CoglMaterialLayer *layer);
_cogl_material_layer_get_wrap_mode_p (CoglMaterialLayer *layer);
void
_cogl_material_set_user_program (CoglMaterial *material,

68
clutter/cogl/cogl/cogl-material.c
View File

@ -1544,7 +1544,7 @@ _cogl_material_layer_initialize_state (CoglMaterialLayer *dest,
{
dest->wrap_mode_s = src->wrap_mode_s;
dest->wrap_mode_t = src->wrap_mode_t;
dest->wrap_mode_r = src->wrap_mode_r;
dest->wrap_mode_p = src->wrap_mode_p;
}
if (differences & COGL_MATERIAL_LAYER_STATE_NEEDS_BIG_STATE)
@ -2223,14 +2223,14 @@ _cogl_material_set_layer_wrap_modes (CoglMaterial *material,
CoglMaterialLayer *authority,
CoglMaterialWrapModeInternal wrap_mode_s,
CoglMaterialWrapModeInternal wrap_mode_t,
CoglMaterialWrapModeInternal wrap_mode_r)
CoglMaterialWrapModeInternal wrap_mode_p)
{
CoglMaterialLayer *new;
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
if (authority->wrap_mode_s == wrap_mode_s &&
authority->wrap_mode_t == wrap_mode_t &&
authority->wrap_mode_r == wrap_mode_r)
authority->wrap_mode_p == wrap_mode_p)
return;
new = _cogl_material_layer_pre_change_notify (material, layer, change);
@ -2251,7 +2251,7 @@ _cogl_material_set_layer_wrap_modes (CoglMaterial *material,
if (old_authority->wrap_mode_s == wrap_mode_s &&
old_authority->wrap_mode_t == wrap_mode_t &&
old_authority->wrap_mode_r == wrap_mode_r)
old_authority->wrap_mode_p == wrap_mode_p)
{
layer->differences &= ~change;
@ -2266,7 +2266,7 @@ _cogl_material_set_layer_wrap_modes (CoglMaterial *material,
layer->wrap_mode_s = wrap_mode_s;
layer->wrap_mode_t = wrap_mode_t;
layer->wrap_mode_r = wrap_mode_r;
layer->wrap_mode_p = wrap_mode_p;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
@ -2322,7 +2322,7 @@ cogl_material_set_layer_wrap_mode_s (CoglMaterial *material,
_cogl_material_set_layer_wrap_modes (material, layer, authority,
internal_mode,
authority->wrap_mode_t,
authority->wrap_mode_r);
authority->wrap_mode_p);
}
void
@ -2353,13 +2353,25 @@ cogl_material_set_layer_wrap_mode_t (CoglMaterial *material,
_cogl_material_set_layer_wrap_modes (material, layer, authority,
authority->wrap_mode_s,
internal_mode,
authority->wrap_mode_r);
authority->wrap_mode_p);
}
/* TODO: this should be made public once we add support for 3D
textures in Cogl */
/* The rationale for naming the third texture coordinate 'p' instead
of OpenGL's usual 'r' is that 'r' conflicts with the usual naming
of the 'red' component when treating a vector as a color. Under
GLSL this is awkward because the texture swizzling for a vector
uses a single letter for each component and the names for colors,
textures and positions are synonymous. GLSL works around this by
naming the components of the texture s, t, p and q. Cogl already
effectively already exposes this naming because it exposes GLSL so
it makes sense to use that naming consistently. Another alternative
could be u, v and w. This is what Blender and Direct3D use. However
the w component conflicts with the w component of a position
vertex. */
void
_cogl_material_set_layer_wrap_mode_r (CoglMaterial *material,
_cogl_material_set_layer_wrap_mode_p (CoglMaterial *material,
int layer_index,
CoglMaterialWrapMode mode)
{
@ -2493,18 +2505,18 @@ cogl_material_get_layer_wrap_mode_t (CoglMaterial *material, int layer_index)
}
CoglMaterialWrapMode
_cogl_material_layer_get_wrap_mode_r (CoglMaterialLayer *layer)
_cogl_material_layer_get_wrap_mode_p (CoglMaterialLayer *layer)
{
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, change);
return internal_to_public_wrap_mode (authority->wrap_mode_r);
return internal_to_public_wrap_mode (authority->wrap_mode_p);
}
/* TODO: make this public when we expose 3D textures. */
CoglMaterialWrapMode
_cogl_material_get_layer_wrap_mode_r (CoglMaterial *material, int layer_index)
_cogl_material_get_layer_wrap_mode_p (CoglMaterial *material, int layer_index)
{
CoglMaterialLayer *layer;
@ -2518,14 +2530,14 @@ _cogl_material_get_layer_wrap_mode_r (CoglMaterial *material, int layer_index)
* material. */
layer = _cogl_material_get_layer (material, layer_index);
return _cogl_material_layer_get_wrap_mode_r (layer);
return _cogl_material_layer_get_wrap_mode_p (layer);
}
static void
_cogl_material_layer_get_wrap_modes (CoglMaterialLayer *layer,
CoglMaterialWrapModeInternal *wrap_mode_s,
CoglMaterialWrapModeInternal *wrap_mode_t,
CoglMaterialWrapModeInternal *wrap_mode_r)
CoglMaterialWrapModeInternal *wrap_mode_p)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
@ -2533,7 +2545,7 @@ _cogl_material_layer_get_wrap_modes (CoglMaterialLayer *layer,
*wrap_mode_s = authority->wrap_mode_s;
*wrap_mode_t = authority->wrap_mode_t;
*wrap_mode_r = authority->wrap_mode_r;
*wrap_mode_p = authority->wrap_mode_p;
}
gboolean
@ -2673,7 +2685,7 @@ apply_wrap_mode_overrides_cb (CoglMaterialLayer *layer,
COGL_MATERIAL_LAYER_STATE_WRAP_MODES);
CoglMaterialWrapModeInternal wrap_mode_s;
CoglMaterialWrapModeInternal wrap_mode_t;
CoglMaterialWrapModeInternal wrap_mode_r;
CoglMaterialWrapModeInternal wrap_mode_p;
g_return_val_if_fail (state->i < 32, FALSE);
@ -2683,16 +2695,16 @@ apply_wrap_mode_overrides_cb (CoglMaterialLayer *layer,
wrap_mode_t = state->wrap_mode_overrides->values[state->i].t;
if (wrap_mode_t == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_t = (CoglMaterialWrapModeInternal)authority->wrap_mode_t;
wrap_mode_r = state->wrap_mode_overrides->values[state->i].r;
if (wrap_mode_r == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_r = (CoglMaterialWrapModeInternal)authority->wrap_mode_r;
wrap_mode_p = state->wrap_mode_overrides->values[state->i].p;
if (wrap_mode_p == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_p = (CoglMaterialWrapModeInternal)authority->wrap_mode_p;
_cogl_material_set_layer_wrap_modes (state->material,
layer,
authority,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
wrap_mode_p);
state->i++;
@ -2973,7 +2985,7 @@ _cogl_material_layer_wrap_modes_equal (CoglMaterialLayer *authority0,
{
if (authority0->wrap_mode_s != authority1->wrap_mode_s ||
authority0->wrap_mode_t != authority1->wrap_mode_t ||
authority0->wrap_mode_r != authority1->wrap_mode_r)
authority0->wrap_mode_p != authority1->wrap_mode_p)
return FALSE;
return TRUE;
@ -4515,7 +4527,7 @@ _cogl_material_init_default_layers (void)
layer->wrap_mode_s = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->wrap_mode_t = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->wrap_mode_r = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->wrap_mode_p = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->big_state = big_state;
layer->has_big_state = TRUE;
@ -5828,8 +5840,8 @@ static void
_cogl_material_layer_forward_wrap_modes (CoglMaterialLayer *layer,
CoglHandle texture)
{
CoglMaterialWrapModeInternal wrap_mode_s, wrap_mode_t, wrap_mode_r;
GLenum gl_wrap_mode_s, gl_wrap_mode_t, gl_wrap_mode_r;
CoglMaterialWrapModeInternal wrap_mode_s, wrap_mode_t, wrap_mode_p;
GLenum gl_wrap_mode_s, gl_wrap_mode_t, gl_wrap_mode_p;
if (texture == COGL_INVALID_HANDLE)
return;
@ -5837,7 +5849,7 @@ _cogl_material_layer_forward_wrap_modes (CoglMaterialLayer *layer,
_cogl_material_layer_get_wrap_modes (layer,
&wrap_mode_s,
&wrap_mode_t,
&wrap_mode_r);
&wrap_mode_p);
/* Update the wrap mode on the texture object. The texture backend
should cache the value so that it will be a no-op if the object
@ -5860,15 +5872,15 @@ _cogl_material_layer_forward_wrap_modes (CoglMaterialLayer *layer,
else
gl_wrap_mode_t = wrap_mode_t;
if (wrap_mode_r == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_r = GL_CLAMP_TO_EDGE;
if (wrap_mode_p == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_p = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_r = wrap_mode_r;
gl_wrap_mode_p = wrap_mode_p;
_cogl_texture_set_wrap_mode_parameters (texture,
gl_wrap_mode_s,
gl_wrap_mode_t,
gl_wrap_mode_r);
gl_wrap_mode_p);
}
/* OpenGL associates the min/mag filters and repeat modes with the

4
clutter/cogl/cogl/cogl-sub-texture.c
View File

@ -227,14 +227,14 @@ static void
_cogl_sub_texture_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_set_wrap_mode_parameters (sub_tex->full_texture,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
wrap_mode_p);
}
static void

2
clutter/cogl/cogl/cogl-texture-2d-sliced.c
View File

@ -667,7 +667,7 @@ static void
_cogl_texture_2d_sliced_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);

2
clutter/cogl/cogl/cogl-texture-2d.c
View File

@ -128,7 +128,7 @@ static void
_cogl_texture_2d_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);

2
clutter/cogl/cogl/cogl-texture-3d-private.h
View File

@ -51,7 +51,7 @@ struct _CoglTexture3D
GLenum mag_filter;
GLint wrap_mode_s;
GLint wrap_mode_t;
GLint wrap_mode_r;
GLint wrap_mode_p;
gboolean auto_mipmap;
gboolean mipmaps_dirty;
};

10
clutter/cogl/cogl/cogl-texture-3d.c
View File

@ -137,7 +137,7 @@ static void
_cogl_texture_3d_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
@ -145,18 +145,18 @@ _cogl_texture_3d_set_wrap_mode_parameters (CoglTexture *tex,
to avoid too many GL calls. */
if (tex_3d->wrap_mode_s != wrap_mode_s ||
tex_3d->wrap_mode_t != wrap_mode_t ||
tex_3d->wrap_mode_r != wrap_mode_r)
tex_3d->wrap_mode_p != wrap_mode_p)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, wrap_mode_t) );
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, wrap_mode_r) );
GE( glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, wrap_mode_p) );
tex_3d->wrap_mode_s = wrap_mode_s;
tex_3d->wrap_mode_t = wrap_mode_t;
tex_3d->wrap_mode_r = wrap_mode_r;
tex_3d->wrap_mode_p = wrap_mode_p;
}
}
@ -194,7 +194,7 @@ _cogl_texture_3d_create_base (unsigned int width,
/* Wrap mode not yet set */
tex_3d->wrap_mode_s = GL_FALSE;
tex_3d->wrap_mode_t = GL_FALSE;
tex_3d->wrap_mode_r = GL_FALSE;
tex_3d->wrap_mode_p = GL_FALSE;
tex_3d->format = internal_format;

4
clutter/cogl/cogl/cogl-texture-private.h
View File

@ -124,7 +124,7 @@ struct _CoglTextureVtable
void (* set_wrap_mode_parameters) (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r);
GLenum wrap_mode_p);
CoglPixelFormat (* get_format) (CoglTexture *tex);
GLenum (* get_gl_format) (CoglTexture *tex);
@ -198,7 +198,7 @@ void
_cogl_texture_set_wrap_mode_parameters (CoglHandle handle,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r);
GLenum wrap_mode_p);
void

2
clutter/cogl/cogl/cogl-texture-rectangle.c
View File

@ -151,7 +151,7 @@ static void
_cogl_texture_rectangle_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);

4
clutter/cogl/cogl/cogl-texture.c
View File

@ -267,14 +267,14 @@ void
_cogl_texture_set_wrap_mode_parameters (CoglHandle handle,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTexture *tex = COGL_TEXTURE (handle);
tex->vtable->set_wrap_mode_parameters (tex,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
wrap_mode_p);
}
/* This is like CoglSpanIter except it deals with floats and it

4
clutter/cogl/cogl/cogl-vertex-buffer.c
View File

@ -1682,10 +1682,10 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
COGL_MATERIAL_WRAP_MODE_OVERRIDE_REPEAT;
options.flags |= COGL_MATERIAL_FLUSH_WRAP_MODE_OVERRIDES;
}
if (_cogl_material_layer_get_wrap_mode_r (layer) ==
if (_cogl_material_layer_get_wrap_mode_p (layer) ==
COGL_MATERIAL_WRAP_MODE_AUTOMATIC)
{
options.wrap_mode_overrides.values[i].r =
options.wrap_mode_overrides.values[i].p =
COGL_MATERIAL_WRAP_MODE_OVERRIDE_REPEAT;
options.flags |= COGL_MATERIAL_FLUSH_WRAP_MODE_OVERRIDES;
}

4
clutter/cogl/cogl/winsys/cogl-texture-pixmap-x11.c
View File

@ -1286,7 +1286,7 @@ static void
_cogl_texture_pixmap_x11_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
GLenum wrap_mode_p)
{
CoglTexturePixmapX11 *tex_pixmap = COGL_TEXTURE_PIXMAP_X11 (tex);
CoglHandle child_tex;
@ -1297,7 +1297,7 @@ _cogl_texture_pixmap_x11_set_wrap_mode_parameters (CoglTexture *tex,
_cogl_texture_set_wrap_mode_parameters (child_tex,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
wrap_mode_p);
}
static CoglPixelFormat