diff options
| -rw-r--r-- | src/mesa/main/mipmap.c | 75 |
1 files changed, 50 insertions, 25 deletions
diff --git a/src/mesa/main/mipmap.c b/src/mesa/main/mipmap.c index ed7795aef93..721a227bb53 100644 --- a/src/mesa/main/mipmap.c +++ b/src/mesa/main/mipmap.c @@ -895,6 +895,51 @@ _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. * Stop at texObj's MaxLevel or when we get to the 1x1 texture. @@ -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); |