-/**
- * one-time init for generate mipmap
- * XXX Note: there may be other times we need no-op/simple state like this.
- * In that case, some code refactoring would be good.
- */
-void
-st_init_generate_mipmap(struct st_context *st)
-{
- st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
-}
-
-
-void
-st_destroy_generate_mipmap(struct st_context *st)
-{
- util_destroy_gen_mipmap(st->gen_mipmap);
- st->gen_mipmap = NULL;
-}
-
-
-/**
- * Generate mipmap levels using hardware rendering.
- * \return TRUE if successful, FALSE if not possible
- */
-static boolean
-st_render_mipmap(struct st_context *st,
- GLenum target,
- struct st_texture_object *stObj,
- uint baseLevel, uint lastLevel)
-{
- struct pipe_context *pipe = st->pipe;
- struct pipe_screen *screen = pipe->screen;
- struct pipe_sampler_view *psv = st_get_texture_sampler_view(stObj, pipe);
- const uint face = _mesa_tex_target_to_face(target);
-
- assert(psv->texture == stObj->pt);
- assert(target != GL_TEXTURE_3D); /* not done yet */
-
- /* check if we can render in the texture's format */
- if (!screen->is_format_supported(screen, psv->format, psv->texture->target, 0,
- PIPE_BIND_RENDER_TARGET, 0)) {
- return FALSE;
- }
-
- util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
- PIPE_TEX_FILTER_LINEAR);
-
- return TRUE;
-}
-
-
-/**
- * Helper function to decompress an image. The result is a 32-bpp RGBA
- * image with stride==width.
- */
-static void
-decompress_image(enum pipe_format format,
- const uint8_t *src, uint8_t *dst,
- unsigned width, unsigned height)
-{
- const struct util_format_description *desc = util_format_description(format);
- const uint bw = util_format_get_blockwidth(format);
- const uint bh = util_format_get_blockheight(format);
- const uint dst_stride = 4 * MAX2(width, bw);
- const uint src_stride = util_format_get_stride(format, width);
-
- desc->unpack_rgba_8unorm(dst, dst_stride, src, src_stride, width, height);
-
- if (width < bw || height < bh) {
- /* We're decompressing an image smaller than the compression
- * block size. We don't want garbage pixel values in the region
- * outside (width x height) so replicate pixels from the (width
- * x height) region to fill out the (bw x bh) block size.
- */
- uint x, y;
- for (y = 0; y < bh; y++) {
- for (x = 0; x < bw; x++) {
- if (x >= width || y >= height) {
- uint p = (y * bw + x) * 4;
- dst[p + 0] = dst[0];
- dst[p + 1] = dst[1];
- dst[p + 2] = dst[2];
- dst[p + 3] = dst[3];
- }
- }
- }
- }
-}
-
-
-/**
- * Helper function to compress an image. The source is a 32-bpp RGBA image
- * with stride==width.
- */
-static void
-compress_image(enum pipe_format format,
- const uint8_t *src, uint8_t *dst,
- unsigned width, unsigned height)
-{
- const struct util_format_description *desc = util_format_description(format);
- const uint dst_stride = util_format_get_stride(format, width);
- const uint src_stride = 4 * width;
-
- desc->pack_rgba_8unorm(dst, dst_stride, src, src_stride, width, height);
-}
-
-
-/**
- * Software fallback for generate mipmap levels.
- */
-static void
-fallback_generate_mipmap(struct gl_context *ctx, GLenum target,
- struct gl_texture_object *texObj)
-{
- struct pipe_context *pipe = st_context(ctx)->pipe;
- struct pipe_resource *pt = st_get_texobj_resource(texObj);
- const uint baseLevel = texObj->BaseLevel;
- const uint lastLevel = pt->last_level;
- const uint face = _mesa_tex_target_to_face(target), zslice = 0;
- uint dstLevel;
- GLenum datatype;
- GLuint comps;
- GLboolean compressed;
-
- if (ST_DEBUG & DEBUG_FALLBACK)
- debug_printf("%s: fallback processing\n", __FUNCTION__);
-
- assert(target != GL_TEXTURE_3D); /* not done yet */
-
- compressed =
- _mesa_is_format_compressed(texObj->Image[face][baseLevel]->TexFormat);
-
- if (compressed) {
- datatype = GL_UNSIGNED_BYTE;
- comps = 4;
- }
- else {
- _mesa_format_to_type_and_comps(texObj->Image[face][baseLevel]->TexFormat,
- &datatype, &comps);
- assert(comps > 0 && "bad texture format in fallback_generate_mipmap()");
- }
-
- for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
- const uint srcLevel = dstLevel - 1;
- const uint srcWidth = u_minify(pt->width0, srcLevel);
- const uint srcHeight = u_minify(pt->height0, srcLevel);
- const uint srcDepth = u_minify(pt->depth0, srcLevel);
- const uint dstWidth = u_minify(pt->width0, dstLevel);
- const uint dstHeight = u_minify(pt->height0, dstLevel);
- const uint dstDepth = u_minify(pt->depth0, dstLevel);
- struct pipe_transfer *srcTrans, *dstTrans;
- const ubyte *srcData;
- ubyte *dstData;
- int srcStride, dstStride;
-
- srcTrans = pipe_get_transfer(st_context(ctx)->pipe, pt, face,
- srcLevel, zslice,
- PIPE_TRANSFER_READ, 0, 0,
- srcWidth, srcHeight);
-
-
- dstTrans = pipe_get_transfer(st_context(ctx)->pipe, pt, face,
- dstLevel, zslice,
- PIPE_TRANSFER_WRITE, 0, 0,
- dstWidth, dstHeight);
-
- srcData = (ubyte *) pipe_transfer_map(pipe, srcTrans);
- dstData = (ubyte *) pipe_transfer_map(pipe, dstTrans);
-
- srcStride = srcTrans->stride / util_format_get_blocksize(srcTrans->resource->format);
- dstStride = dstTrans->stride / util_format_get_blocksize(dstTrans->resource->format);
-
- if (compressed) {
- const enum pipe_format format = pt->format;
- const uint bw = util_format_get_blockwidth(format);
- const uint bh = util_format_get_blockheight(format);
- const uint srcWidth2 = align(srcWidth, bw);
- const uint srcHeight2 = align(srcHeight, bh);
- const uint dstWidth2 = align(dstWidth, bw);
- const uint dstHeight2 = align(dstHeight, bh);
- uint8_t *srcTemp, *dstTemp;
-
- assert(comps == 4);
-
- srcTemp = malloc(srcWidth2 * srcHeight2 * comps + 000);
- dstTemp = malloc(dstWidth2 * dstHeight2 * comps + 000);
-
- /* decompress the src image: srcData -> srcTemp */
- decompress_image(format, srcData, srcTemp, srcWidth, srcHeight);
-
- _mesa_generate_mipmap_level(target, datatype, comps,
- 0 /*border*/,
- srcWidth2, srcHeight2, srcDepth,
- srcTemp,
- srcWidth2, /* stride in texels */
- dstWidth2, dstHeight2, dstDepth,
- dstTemp,
- dstWidth2); /* stride in texels */
-
- /* compress the new image: dstTemp -> dstData */
- compress_image(format, dstTemp, dstData, dstWidth, dstHeight);
-
- free(srcTemp);
- free(dstTemp);
- }
- else {
- _mesa_generate_mipmap_level(target, datatype, comps,
- 0 /*border*/,
- srcWidth, srcHeight, srcDepth,
- srcData,
- srcStride, /* stride in texels */
- dstWidth, dstHeight, dstDepth,
- dstData,
- dstStride); /* stride in texels */
- }
-
- pipe_transfer_unmap(pipe, srcTrans);
- pipe_transfer_unmap(pipe, dstTrans);
-
- pipe->transfer_destroy(pipe, srcTrans);
- pipe->transfer_destroy(pipe, dstTrans);
- }
-}
-
-