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code refactoring, new next_mipmap_level_size() function

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This commit is contained in:
Brian 2008-02-11 09:43:30 -07:00
parent e4026167d7
commit c22d9152e3
1 changed files with 50 additions and 25 deletions
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75
src/mesa/main/mipmap.c
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@ -894,6 +894,51 @@ _mesa_generate_mipmap_level(GLenum target,
}
/**
* compute next (level+1) image size
* \return GL_FALSE if no smaller size can be generated (eg. src is 1x1x1 size)
*/
static GLboolean
next_mipmap_level_size(GLenum target, GLint border,
GLint srcWidth, GLint srcHeight, GLint srcDepth,
GLint *dstWidth, GLint *dstHeight, GLint *dstDepth)
{
if (srcWidth - 2 * border > 1) {
*dstWidth = (srcWidth - 2 * border) / 2 + 2 * border;
}
else {
*dstWidth = srcWidth; /* can't go smaller */
}
if ((srcHeight - 2 * border > 1) &&
(target != GL_TEXTURE_1D_ARRAY_EXT)) {
*dstHeight = (srcHeight - 2 * border) / 2 + 2 * border;
}
else {
*dstHeight = srcHeight; /* can't go smaller */
}
if ((srcDepth - 2 * border > 1) &&
(target != GL_TEXTURE_2D_ARRAY_EXT)) {
*dstDepth = (srcDepth - 2 * border) / 2 + 2 * border;
}
else {
*dstDepth = srcDepth; /* can't go smaller */
}
if (*dstWidth == srcWidth &&
*dstHeight == srcHeight &&
*dstDepth == srcDepth) {
return GL_FALSE;
}
else {
return GL_TRUE;
}
}
/**
* For GL_SGIX_generate_mipmap:
* Generate a complete set of mipmaps from texObj's base-level image.
@ -982,6 +1027,7 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
GLint srcWidth, srcHeight, srcDepth;
GLint dstWidth, dstHeight, dstDepth;
GLint border, bytesPerTexel;
GLboolean nextLevel;
/* get src image parameters */
srcImage = _mesa_select_tex_image(ctx, texObj, target, level);
@ -991,31 +1037,10 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
srcDepth = srcImage->Depth;
border = srcImage->Border;
/* compute next (level+1) image size */
if (srcWidth - 2 * border > 1) {
dstWidth = (srcWidth - 2 * border) / 2 + 2 * border;
}
else {
dstWidth = srcWidth; /* can't go smaller */
}
if ((srcHeight - 2 * border > 1) &&
(texObj->Target != GL_TEXTURE_1D_ARRAY_EXT)) {
dstHeight = (srcHeight - 2 * border) / 2 + 2 * border;
}
else {
dstHeight = srcHeight; /* can't go smaller */
}
if ((srcDepth - 2 * border > 1) &&
(texObj->Target != GL_TEXTURE_2D_ARRAY_EXT)) {
dstDepth = (srcDepth - 2 * border) / 2 + 2 * border;
}
else {
dstDepth = srcDepth; /* can't go smaller */
}
if (dstWidth == srcWidth &&
dstHeight == srcHeight &&
dstDepth == srcDepth) {
nextLevel = next_mipmap_level_size(target, border,
srcWidth, srcHeight, srcDepth,
&dstWidth, &dstHeight, &dstDepth);
if (!nextLevel) {
/* all done */
if (srcImage->IsCompressed) {
_mesa_free((void *) srcData);