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/* libs/opengles/mipmap.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include "context.h"
#include "state.h"
#include "texture.h"
#include "TextureObjectManager.h"
namespace android {
// ----------------------------------------------------------------------------
status_t buildAPyramid(ogles_context_t* c, EGLTextureObject* tex)
{
int level = 0;
const GGLSurface* base = &tex->surface;
const GGLFormat& pixelFormat(c->rasterizer.formats[base->format]);
int w = base->width;
int h = base->height;
if ((w&h) == 1)
return NO_ERROR;
w = (w>>1) ? : 1;
h = (h>>1) ? : 1;
while(true) {
++level;
const int bpr = w * pixelFormat.size;
if (tex->reallocate(level, w, h, w,
base->format, base->compressedFormat, bpr) != NO_ERROR) {
return NO_MEMORY;
}
int stride = w;
int bs = base->stride;
GGLSurface& cur = tex->editMip(level);
if (base->format == GGL_PIXEL_FORMAT_RGB_565)
{
uint16_t const * src = (uint16_t const *)base->data;
uint16_t* dst = (uint16_t*)cur.data;
const uint32_t mask = 0x07E0F81F;
for (int y=0 ; y<h ; y++) {
size_t offset = (y*2) * bs;
for (int x=0 ; x<w ; x++) {
uint32_t p00 = src[offset];
uint32_t p10 = src[offset+1];
uint32_t p01 = src[offset+bs];
uint32_t p11 = src[offset+bs+1];
p00 = (p00 | (p00 << 16)) & mask;
p01 = (p01 | (p01 << 16)) & mask;
p10 = (p10 | (p10 << 16)) & mask;
p11 = (p11 | (p11 << 16)) & mask;
uint32_t grb = ((p00 + p10 + p01 + p11) >> 2) & mask;
uint32_t rgb = (grb & 0xFFFF) | (grb >> 16);
dst[x + y*stride] = rgb;
offset += 2;
}
}
}
else if (base->format == GGL_PIXEL_FORMAT_RGBA_5551)
{
uint16_t const * src = (uint16_t const *)base->data;
uint16_t* dst = (uint16_t*)cur.data;
for (int y=0 ; y<h ; y++) {
size_t offset = (y*2) * bs;
for (int x=0 ; x<w ; x++) {
uint32_t p00 = src[offset];
uint32_t p10 = src[offset+1];
uint32_t p01 = src[offset+bs];
uint32_t p11 = src[offset+bs+1];
uint32_t r = ((p00>>11)+(p10>>11)+(p01>>11)+(p11>>11)+2)>>2;
uint32_t g = (((p00>>6)+(p10>>6)+(p01>>6)+(p11>>6)+2)>>2)&0x3F;
uint32_t b = ((p00&0x3E)+(p10&0x3E)+(p01&0x3E)+(p11&0x3E)+4)>>3;
uint32_t a = ((p00&1)+(p10&1)+(p01&1)+(p11&1)+2)>>2;
dst[x + y*stride] = (r<<11)|(g<<6)|(b<<1)|a;
offset += 2;
}
}
}
else if (base->format == GGL_PIXEL_FORMAT_RGBA_8888)
{
uint32_t const * src = (uint32_t const *)base->data;
uint32_t* dst = (uint32_t*)cur.data;
for (int y=0 ; y<h ; y++) {
size_t offset = (y*2) * bs;
for (int x=0 ; x<w ; x++) {
uint32_t p00 = src[offset];
uint32_t p10 = src[offset+1];
uint32_t p01 = src[offset+bs];
uint32_t p11 = src[offset+bs+1];
uint32_t rb00 = p00 & 0x00FF00FF;
uint32_t rb01 = p01 & 0x00FF00FF;
uint32_t rb10 = p10 & 0x00FF00FF;
uint32_t rb11 = p11 & 0x00FF00FF;
uint32_t ga00 = (p00 >> 8) & 0x00FF00FF;
uint32_t ga01 = (p01 >> 8) & 0x00FF00FF;
uint32_t ga10 = (p10 >> 8) & 0x00FF00FF;
uint32_t ga11 = (p11 >> 8) & 0x00FF00FF;
uint32_t rb = (rb00 + rb01 + rb10 + rb11)>>2;
uint32_t ga = (ga00 + ga01 + ga10 + ga11)>>2;
uint32_t rgba = (rb & 0x00FF00FF) | ((ga & 0x00FF00FF)<<8);
dst[x + y*stride] = rgba;
offset += 2;
}
}
}
else if ((base->format == GGL_PIXEL_FORMAT_RGB_888) ||
(base->format == GGL_PIXEL_FORMAT_LA_88) ||
(base->format == GGL_PIXEL_FORMAT_A_8) ||
(base->format == GGL_PIXEL_FORMAT_L_8))
{
int skip;
switch (base->format) {
case GGL_PIXEL_FORMAT_RGB_888: skip = 3; break;
case GGL_PIXEL_FORMAT_LA_88: skip = 2; break;
default: skip = 1; break;
}
uint8_t const * src = (uint8_t const *)base->data;
uint8_t* dst = (uint8_t*)cur.data;
bs *= skip;
stride *= skip;
for (int y=0 ; y<h ; y++) {
size_t offset = (y*2) * bs;
for (int x=0 ; x<w ; x++) {
for (int c=0 ; c<skip ; c++) {
uint32_t p00 = src[c+offset];
uint32_t p10 = src[c+offset+skip];
uint32_t p01 = src[c+offset+bs];
uint32_t p11 = src[c+offset+bs+skip];
dst[x + y*stride + c] = (p00 + p10 + p01 + p11) >> 2;
}
offset += 2*skip;
}
}
}
else if (base->format == GGL_PIXEL_FORMAT_RGBA_4444)
{
uint16_t const * src = (uint16_t const *)base->data;
uint16_t* dst = (uint16_t*)cur.data;
for (int y=0 ; y<h ; y++) {
size_t offset = (y*2) * bs;
for (int x=0 ; x<w ; x++) {
uint32_t p00 = src[offset];
uint32_t p10 = src[offset+1];
uint32_t p01 = src[offset+bs];
uint32_t p11 = src[offset+bs+1];
p00 = ((p00 << 12) & 0x0F0F0000) | (p00 & 0x0F0F);
p10 = ((p10 << 12) & 0x0F0F0000) | (p10 & 0x0F0F);
p01 = ((p01 << 12) & 0x0F0F0000) | (p01 & 0x0F0F);
p11 = ((p11 << 12) & 0x0F0F0000) | (p11 & 0x0F0F);
uint32_t rbga = (p00 + p10 + p01 + p11) >> 2;
uint32_t rgba = (rbga & 0x0F0F) | ((rbga>>12) & 0xF0F0);
dst[x + y*stride] = rgba;
offset += 2;
}
}
} else {
LOGE("Unsupported format (%d)", base->format);
return BAD_TYPE;
}
// exit condition: we just processed the 1x1 LODs
if ((w&h) == 1)
break;
base = &cur;
w = (w>>1) ? : 1;
h = (h>>1) ? : 1;
}
return NO_ERROR;
}
}; // namespace android
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