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/* libs/pixelflinger/raster.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 <string.h>
#include "raster.h"
#include "trap.h"
namespace android {
static void ggl_rasterPos2x(void* con, GGLfixed x, GGLfixed y);
static void ggl_rasterPos2i(void* con, GGLint x, GGLint y);
static void ggl_copyPixels(void* con, GGLint xs, GGLint ys,
GGLsizei width, GGLsizei height, GGLenum type);
void ggl_init_raster(context_t* c)
{
GGLContext& procs = *(GGLContext*)c;
GGL_INIT_PROC(procs, copyPixels);
GGL_INIT_PROC(procs, rasterPos2x);
GGL_INIT_PROC(procs, rasterPos2i);
}
void ggl_rasterPos2x(void* con, GGLfixed x, GGLfixed y)
{
GGL_CONTEXT(c, con);
// raster pos should be processed just like glVertex
c->state.raster.x = x;
c->state.raster.y = y;
}
void ggl_rasterPos2i(void* con, GGLint x, GGLint y)
{
ggl_rasterPos2x(con, gglIntToFixed(x), gglIntToFixed(y));
}
void ggl_copyPixels(void* con, GGLint xs, GGLint ys,
GGLsizei width, GGLsizei height, GGLenum type)
{
GGL_CONTEXT(c, con);
// color-buffer
surface_t* cb = &(c->state.buffers.color);
// undefined behaviour if we try to copy from outside the surface
if (uint32_t(xs) > cb->width)
return;
if (uint32_t(ys) > cb->height)
return;
if (uint32_t(xs + width) > cb->width)
return;
if (uint32_t(ys + height) > cb->height)
return;
// copy to current raster position
GGLint xd = gglFixedToIntRound(c->state.raster.x);
GGLint yd = gglFixedToIntRound(c->state.raster.y);
// clip to scissor
if (xd < GGLint(c->state.scissor.left)) {
GGLint offset = GGLint(c->state.scissor.left) - xd;
xd = GGLint(c->state.scissor.left);
xs += offset;
width -= offset;
}
if (yd < GGLint(c->state.scissor.top)) {
GGLint offset = GGLint(c->state.scissor.top) - yd;
yd = GGLint(c->state.scissor.top);
ys += offset;
height -= offset;
}
if ((xd + width) > GGLint(c->state.scissor.right)) {
width = GGLint(c->state.scissor.right) - xd;
}
if ((yd + height) > GGLint(c->state.scissor.bottom)) {
height = GGLint(c->state.scissor.bottom) - yd;
}
if (width<=0 || height<=0) {
return; // nothing to copy
}
if (xs==xd && ys==yd) {
// nothing to do, but be careful, this might not be true when we support
// gglPixelTransfer, gglPixelMap and gglPixelZoom
return;
}
const GGLFormat* fp = &(c->formats[cb->format]);
uint8_t* src = reinterpret_cast<uint8_t*>(cb->data)
+ (xs + (cb->stride * ys)) * fp->size;
uint8_t* dst = reinterpret_cast<uint8_t*>(cb->data)
+ (xd + (cb->stride * yd)) * fp->size;
const size_t bpr = cb->stride * fp->size;
const size_t rowsize = width * fp->size;
size_t yc = height;
if (ys < yd) {
// bottom to top
src += height * bpr;
dst += height * bpr;
do {
dst -= bpr;
src -= bpr;
memcpy(dst, src, rowsize);
} while (--yc);
} else {
if (ys == yd) {
// might be right to left
do {
memmove(dst, src, rowsize);
dst += bpr;
src += bpr;
} while (--yc);
} else {
// top to bottom
do {
memcpy(dst, src, rowsize);
dst += bpr;
src += bpr;
} while (--yc);
}
}
}
}; // namespace android
using namespace android;
GGLint gglBitBlit(GGLContext* con, int tmu, GGLint crop[4], GGLint where[4])
{
GGL_CONTEXT(c, (void*)con);
GGLint x = where[0];
GGLint y = where[1];
GGLint w = where[2];
GGLint h = where[3];
// exclsively enable this tmu
const GGLSurface& cbSurface = c->state.buffers.color.s;
c->procs.activeTexture(c, tmu);
c->procs.disable(c, GGL_W_LERP);
uint32_t tmus = 1UL<<tmu;
if (c->state.enabled_tmu != tmus) {
c->activeTMU->enable = 1;
c->state.enabled_tmu = tmus;
c->state.enables |= GGL_ENABLE_TMUS;
ggl_state_changed(c, GGL_TMU_STATE);
}
const GGLint Wcr = crop[2];
const GGLint Hcr = crop[3];
if ((w == Wcr) && (h == Hcr)) {
c->procs.texGeni(c, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
c->procs.texGeni(c, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
const GGLint Ucr = crop[0];
const GGLint Vcr = crop[1];
const GGLint s0 = Ucr - x;
const GGLint t0 = Vcr - y;
c->procs.texCoord2i(c, s0, t0);
c->procs.recti(c, x, y, x+w, y+h);
} else {
int32_t texcoords[8];
x = gglIntToFixed(x);
y = gglIntToFixed(y);
// we CLAMP here, which works with premultiplied (s,t)
c->procs.texParameteri(c, GGL_TEXTURE_2D, GGL_TEXTURE_WRAP_S, GGL_CLAMP);
c->procs.texParameteri(c, GGL_TEXTURE_2D, GGL_TEXTURE_WRAP_T, GGL_CLAMP);
c->procs.texGeni(c, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_AUTOMATIC);
c->procs.texGeni(c, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_AUTOMATIC);
const GGLint Ucr = crop[0] << 16;
const GGLint Vcr = crop[1] << 16;
const GGLint Wcr = crop[2] << 16;
const GGLint Hcr = crop[3] << 16;
// computes texture coordinates (pre-multiplied)
int32_t dsdx = Wcr / w; // dsdx = ((Wcr/w)/Wt)*Wt
int32_t dtdy = Hcr / h; // dtdy = ((Hcr/h)/Ht)*Ht
int32_t s0 = Ucr - gglMulx(dsdx, x); // s0 = Ucr - x * dsdx
int32_t t0 = Vcr - gglMulx(dtdy, y); // t0 = Vcr - y * dtdy
texcoords[0] = s0;
texcoords[1] = dsdx;
texcoords[2] = 0;
texcoords[3] = t0;
texcoords[4] = 0;
texcoords[5] = dtdy;
texcoords[6] = 0;
texcoords[7] = 0;
c->procs.texCoordGradScale8xv(c, tmu, texcoords);
c->procs.recti(c,
gglFixedToIntRound(x),
gglFixedToIntRound(y),
gglFixedToIntRound(x)+w,
gglFixedToIntRound(y)+h);
}
return 0;
}
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