texformat_tmp.h

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * Mesa 3-D graphics library
 * Version:  6.5.1
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


/**
 * \file texformat_tmp.h
 * Texel fetch functions template.
 * 
 * This template file is used by texformat.c to generate texel fetch functions
 * for 1-D, 2-D and 3-D texture images. 
 *
 * It should be expanded by defining \p DIM as the number texture dimensions
 * (1, 2 or 3).  According to the value of \p DIM a series of macros is defined
 * for the texel lookup in the gl_texture_image::Data.
 * 
 * \sa texformat.c and FetchTexel.
 * 
 * \author Gareth Hughes
 * \author Brian Paul
 */


#if DIM == 1

#define TEXEL_ADDR( type, image, i, j, k, size ) \
	((void) (j), (void) (k), ((type *)(image)->Data + (i) * (size)))

#define FETCH(x) fetch_texel_1d_##x

#elif DIM == 2

#define TEXEL_ADDR( type, image, i, j, k, size )			\
	((void) (k),							\
	 ((type *)(image)->Data + ((image)->RowStride * (j) + (i)) * (size)))

#define FETCH(x) fetch_texel_2d_##x

#elif DIM == 3

#define TEXEL_ADDR( type, image, i, j, k, size )			\
	((type *)(image)->Data + ((image)->ImageOffsets[k]		\
             + (image)->RowStride * (j) + (i)) * (size))

#define FETCH(x) fetch_texel_3d_##x

#else
#error	illegal number of texture dimensions
#endif


/* MESA_FORMAT_RGBA **********************************************************/

/* Fetch texel from 1D, 2D or 3D RGBA texture, returning 4 GLchans */
static void FETCH(rgba)( const struct gl_texture_image *texImage,
			 GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 4);
   COPY_CHAN4( texel, src );
}

/* Fetch texel from 1D, 2D or 3D RGBA texture, returning 4 GLfloats */
static void FETCH(f_rgba)( const struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 4);
   texel[RCOMP] = CHAN_TO_FLOAT(src[0]);
   texel[GCOMP] = CHAN_TO_FLOAT(src[1]);
   texel[BCOMP] = CHAN_TO_FLOAT(src[2]);
   texel[ACOMP] = CHAN_TO_FLOAT(src[3]);
}

#if DIM == 3
/* Store a GLchan RGBA texel */
static void store_texel_rgba(struct gl_texture_image *texImage,
                             GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 4);
   dst[0] = rgba[RCOMP];
   dst[1] = rgba[GCOMP];
   dst[2] = rgba[BCOMP];
   dst[3] = rgba[ACOMP];
}
#endif

/* MESA_FORMAT_RGB ***********************************************************/

/* Fetch texel from 1D, 2D or 3D RGB texture, returning 4 GLchans */
static void FETCH(rgb)( const struct gl_texture_image *texImage,
			GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 3);
   texel[RCOMP] = src[0];
   texel[GCOMP] = src[1];
   texel[BCOMP] = src[2];
   texel[ACOMP] = CHAN_MAX;
}

/* Fetch texel from 1D, 2D or 3D RGB texture, returning 4 GLfloats */
static void FETCH(f_rgb)( const struct gl_texture_image *texImage,
                          GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 3);
   texel[RCOMP] = CHAN_TO_FLOAT(src[0]);
   texel[GCOMP] = CHAN_TO_FLOAT(src[1]);
   texel[BCOMP] = CHAN_TO_FLOAT(src[2]);
   texel[ACOMP] = 1.0F;
}

#if DIM == 3
static void store_texel_rgb(struct gl_texture_image *texImage,
                            GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 3);
   dst[0] = rgba[RCOMP];
   dst[1] = rgba[GCOMP];
   dst[2] = rgba[BCOMP];
}
#endif

/* MESA_FORMAT_ALPHA *********************************************************/

/* Fetch texel from 1D, 2D or 3D ALPHA texture, returning 4 GLchans */
static void FETCH(alpha)( const struct gl_texture_image *texImage,
			  GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] = 0;
   texel[ACOMP] = src[0];
}

#if DIM == 3
static void store_texel_alpha(struct gl_texture_image *texImage,
                              GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   dst[0] = rgba[ACOMP];
}
#endif

/* MESA_FORMAT_LUMINANCE *****************************************************/

/* Fetch texel from 1D, 2D or 3D LUMIN texture, returning 4 GLchans */
static void FETCH(luminance)( const struct gl_texture_image *texImage,
			      GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] = src[0];
   texel[ACOMP] = CHAN_MAX;
}

#if DIM == 3
static void store_texel_luminance(struct gl_texture_image *texImage,
                                  GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   dst[0] = rgba[RCOMP];
}
#endif

/* MESA_FORMAT_LUMINANCE_ALPHA ***********************************************/

/* Fetch texel from 1D, 2D or 3D L_A texture, returning 4 GLchans */
static void FETCH(luminance_alpha)( const struct gl_texture_image *texImage,
				    GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 2);
   texel[RCOMP] = src[0];
   texel[GCOMP] = src[0];
   texel[BCOMP] = src[0];
   texel[ACOMP] = src[1];
}

#if DIM == 3
static void store_texel_luminance_alpha(struct gl_texture_image *texImage,
                                  GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 2);
   dst[0] = rgba[RCOMP];
   dst[1] = rgba[ACOMP];
}
#endif

/* MESA_FORMAT_INTENSITY *****************************************************/

/* Fetch texel from 1D, 2D or 3D INT. texture, returning 4 GLchans */
static void FETCH(intensity)( const struct gl_texture_image *texImage,
			      GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLchan *src = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   texel[RCOMP] = src[0];
   texel[GCOMP] = src[0];
   texel[BCOMP] = src[0];
   texel[ACOMP] = src[0];
}

#if DIM == 3
static void store_texel_intensity(struct gl_texture_image *texImage,
                                  GLint i, GLint j, GLint k, const void *texel)
{
   const GLchan *rgba = (const GLchan *) texel;
   GLchan *dst = TEXEL_ADDR(GLchan, texImage, i, j, k, 1);
   dst[0] = rgba[RCOMP];
}
#endif


/* MESA_FORMAT_Z32 ***********************************************************/

/* Fetch depth texel from 1D, 2D or 3D 32-bit depth texture,
 * returning 1 GLfloat.
 * Note: no GLchan version of this function.
 */
static void FETCH(f_z32)( const struct gl_texture_image *texImage,
                          GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLuint *src = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
   texel[0] = src[0] * (1.0F / 0xffffffff);
}

#if DIM == 3
static void store_texel_z32(struct gl_texture_image *texImage,
                            GLint i, GLint j, GLint k, const void *texel)
{
   const GLuint *depth = (const GLuint *) texel;
   GLuint *dst = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
   dst[0] = *depth;
}
#endif


/* MESA_FORMAT_Z16 ***********************************************************/

/* Fetch depth texel from 1D, 2D or 3D 16-bit depth texture,
 * returning 1 GLfloat.
 * Note: no GLchan version of this function.
 */
static void FETCH(f_z16)(const struct gl_texture_image *texImage,
                         GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLushort *src = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   texel[0] = src[0] * (1.0F / 65535.0F);
}

#if DIM == 3
static void store_texel_z16(struct gl_texture_image *texImage,
                            GLint i, GLint j, GLint k, const void *texel)
{
   const GLushort *depth = (const GLushort *) texel;
   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   dst[0] = *depth;
}
#endif


/* MESA_FORMAT_RGBA_F32 ******************************************************/

/* Fetch texel from 1D, 2D or 3D RGBA_FLOAT32 texture, returning 4 GLfloats.
 */
static void FETCH(f_rgba_f32)( const struct gl_texture_image *texImage,
                               GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLfloat *src = TEXEL_ADDR(GLfloat, texImage, i, j, k, 4);
   texel[RCOMP] = src[0];
   texel[GCOMP] = src[1];
   texel[BCOMP] = src[2];
   texel[ACOMP] = src[3];
}

#if DIM == 3
static void store_texel_rgba_f32(struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, const void *texel)
{
   const GLfloat *depth = (const GLfloat *) texel;
   GLfloat *dst = TEXEL_ADDR(GLfloat, texImage, i, j, k, 1);
   dst[0] = depth[RCOMP];
   dst[1] = depth[GCOMP];
   dst[2] = depth[BCOMP];
   dst[3] = depth[ACOMP];
}
#endif


/* MESA_FORMAT_RGBA_F16 ******************************************************/

/* Fetch texel from 1D, 2D or 3D RGBA_FLOAT16 texture,
 * returning 4 GLfloats.
 */
static void FETCH(f_rgba_f16)( const struct gl_texture_image *texImage,
                               GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLhalfARB *src = TEXEL_ADDR(GLhalfARB, texImage, i, j, k, 4);
   texel[RCOMP] = _mesa_half_to_float(src[0]);
   texel[GCOMP] = _mesa_half_to_float(src[1]);
   texel[BCOMP] = _mesa_half_to_float(src[2]);
   texel[ACOMP] = _mesa_half_to_float(src[3]);
}

#if DIM == 3
static void store_texel_rgba_f16(struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, const void *texel)
{
   const GLfloat *depth = (const GLfloat *) texel;
   GLhalfARB *dst = TEXEL_ADDR(GLhalfARB, texImage, i, j, k, 1);
   dst[0] = _mesa_float_to_half(*depth);
}
#endif

/* MESA_FORMAT_RGB_F32 *******************************************************/

/* Fetch texel from 1D, 2D or 3D RGB_FLOAT32 texture,
 * returning 4 GLfloats.
 */
static void FETCH(f_rgb_f32)( const struct gl_texture_image *texImage,
                              GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLfloat *src = TEXEL_ADDR(GLfloat, texImage, i, j, k, 3);
   texel[RCOMP] = src[0];
   texel[GCOMP] = src[1];
   texel[BCOMP] = src[2];
   texel[ACOMP] = 1.0F;