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reactos/dll/opengl/mesa/swrast/s_zoom.c

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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <precomp.h>
/**
* Compute the bounds of the region resulting from zooming a pixel span.
* The resulting region will be entirely inside the window/scissor bounds
* so no additional clipping is needed.
* \param imageX, imageY position of the mage being drawn (gl WindowPos)
* \param spanX, spanY position of span being drawing
* \param width number of pixels in span
* \param x0, x1 returned X bounds of zoomed region [x0, x1)
* \param y0, y1 returned Y bounds of zoomed region [y0, y1)
* \return GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped
*/
static GLboolean
compute_zoomed_bounds(struct gl_context *ctx, GLint imageX, GLint imageY,
GLint spanX, GLint spanY, GLint width,
GLint *x0, GLint *x1, GLint *y0, GLint *y1)
{
const struct gl_framebuffer *fb = ctx->DrawBuffer;
GLint c0, c1, r0, r1;
ASSERT(spanX >= imageX);
ASSERT(spanY >= imageY);
/*
* Compute destination columns: [c0, c1)
*/
c0 = imageX + (GLint) ((spanX - imageX) * ctx->Pixel.ZoomX);
c1 = imageX + (GLint) ((spanX + width - imageX) * ctx->Pixel.ZoomX);
if (c1 < c0) {
/* swap */
GLint tmp = c1;
c1 = c0;
c0 = tmp;
}
c0 = CLAMP(c0, fb->_Xmin, fb->_Xmax);
c1 = CLAMP(c1, fb->_Xmin, fb->_Xmax);
if (c0 == c1) {
return GL_FALSE; /* no width */
}
/*
* Compute destination rows: [r0, r1)
*/
r0 = imageY + (GLint) ((spanY - imageY) * ctx->Pixel.ZoomY);
r1 = imageY + (GLint) ((spanY + 1 - imageY) * ctx->Pixel.ZoomY);
if (r1 < r0) {
/* swap */
GLint tmp = r1;
r1 = r0;
r0 = tmp;
}
r0 = CLAMP(r0, fb->_Ymin, fb->_Ymax);
r1 = CLAMP(r1, fb->_Ymin, fb->_Ymax);
if (r0 == r1) {
return GL_FALSE; /* no height */
}
*x0 = c0;
*x1 = c1;
*y0 = r0;
*y1 = r1;
return GL_TRUE;
}
/**
* Convert a zoomed x image coordinate back to an unzoomed x coord.
* 'zx' is screen position of a pixel in the zoomed image, who's left edge
* is at 'imageX'.
* return corresponding x coord in the original, unzoomed image.
* This can use this for unzooming X or Y values.
*/
static inline GLint
unzoom_x(GLfloat zoomX, GLint imageX, GLint zx)
{
/*
zx = imageX + (x - imageX) * zoomX;
zx - imageX = (x - imageX) * zoomX;
(zx - imageX) / zoomX = x - imageX;
*/
GLint x;
if (zoomX < 0.0)
zx++;
x = imageX + (GLint) ((zx - imageX) / zoomX);
return x;
}
/**
* Helper function called from _swrast_write_zoomed_rgba/rgb/
* index/depth_span().
*/
static void
zoom_span( struct gl_context *ctx, GLint imgX, GLint imgY, const SWspan *span,
const GLvoid *src, GLenum format )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
SWspan zoomed;
GLint x0, x1, y0, y1;
GLint zoomedWidth;
if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end,
&x0, &x1, &y0, &y1)) {
return; /* totally clipped */
}
if (!swrast->ZoomedArrays) {
/* allocate on demand */
swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));
if (!swrast->ZoomedArrays)
return;
}
zoomedWidth = x1 - x0;
ASSERT(zoomedWidth > 0);
ASSERT(zoomedWidth <= MAX_WIDTH);
/* no pixel arrays! must be horizontal spans. */
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(span->primitive == GL_BITMAP);
INIT_SPAN(zoomed, GL_BITMAP);
zoomed.x = x0;
zoomed.end = zoomedWidth;
zoomed.array = swrast->ZoomedArrays;
zoomed.array->ChanType = span->array->ChanType;
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;
else
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL];
COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);
COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);
COPY_4V(zoomed.attrStepY[FRAG_ATTRIB_WPOS], span->attrStepY[FRAG_ATTRIB_WPOS]);
zoomed.attrStart[FRAG_ATTRIB_FOGC][0] = span->attrStart[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepX[FRAG_ATTRIB_FOGC][0] = span->attrStepX[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepY[FRAG_ATTRIB_FOGC][0] = span->attrStepY[FRAG_ATTRIB_FOGC][0];
if (format == GL_RGBA || format == GL_RGB) {
/* copy Z info */
zoomed.z = span->z;
zoomed.zStep = span->zStep;
/* we'll generate an array of colorss */
zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
zoomed.arrayMask |= SPAN_RGBA;
zoomed.arrayAttribs |= FRAG_BIT_COL; /* we'll produce these values */
ASSERT(span->arrayMask & SPAN_RGBA);
}
else if (format == GL_DEPTH_COMPONENT) {
/* Copy color info */
zoomed.red = span->red;
zoomed.green = span->green;
zoomed.blue = span->blue;
zoomed.alpha = span->alpha;
zoomed.redStep = span->redStep;
zoomed.greenStep = span->greenStep;
zoomed.blueStep = span->blueStep;
zoomed.alphaStep = span->alphaStep;
/* we'll generate an array of depth values */
zoomed.interpMask = span->interpMask & ~SPAN_Z;
zoomed.arrayMask |= SPAN_Z;
ASSERT(span->arrayMask & SPAN_Z);
}
else {
_mesa_problem(ctx, "Bad format in zoom_span");
return;
}
/* zoom the span horizontally */
if (format == GL_RGBA) {
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
const GLushort (*rgba)[4] = (const GLushort (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
COPY_4V(zoomed.array->rgba16[i], rgba[j]);
}
}
else {
const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < span->end);
COPY_4V(zoomed.array->attribs[FRAG_ATTRIB_COL][i], rgba[j]);
}
}
}
else if (format == GL_RGB) {
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->rgba8[i][0] = rgb[j][0];
zoomed.array->rgba8[i][1] = rgb[j][1];
zoomed.array->rgba8[i][2] = rgb[j][2];
zoomed.array->rgba8[i][3] = 0xff;
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
const GLushort (*rgb)[3] = (const GLushort (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->rgba16[i][0] = rgb[j][0];
zoomed.array->rgba16[i][1] = rgb[j][1];
zoomed.array->rgba16[i][2] = rgb[j][2];
zoomed.array->rgba16[i][3] = 0xffff;
}
}
else {
const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < span->end);
zoomed.array->attribs[FRAG_ATTRIB_COL][i][0] = rgb[j][0];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][1] = rgb[j][1];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][2] = rgb[j][2];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][3] = 1.0F;
}
}
}
else if (format == GL_DEPTH_COMPONENT) {
const GLuint *zValues = (const GLuint *) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->z[i] = zValues[j];
}
/* Now, fall into the RGB path below */
format = GL_RGBA;
}
/* write the span in rows [r0, r1) */
if (format == GL_RGBA || format == GL_RGB) {
/* Writing the span may modify the colors, so make a backup now if we're
* going to call _swrast_write_zoomed_span() more than once.
* Also, clipping may change the span end value, so store it as well.
*/
const GLint end = zoomed.end; /* save */
void *rgbaSave;
const GLint pixelSize =
(zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :
((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)
: 4 * sizeof(GLfloat));
rgbaSave = malloc(zoomed.end * pixelSize);
if (!rgbaSave) {
return;
}
if (y1 - y0 > 1) {
memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize);
}
for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) {
_swrast_write_rgba_span(ctx, &zoomed);
zoomed.end = end; /* restore */
if (y1 - y0 > 1) {
/* restore the colors */
memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize);
}
}
free(rgbaSave);
}
}
void
_swrast_write_zoomed_rgba_span(struct gl_context *ctx, GLint imgX, GLint imgY,
const SWspan *span, const GLvoid *rgba)
{
zoom_span(ctx, imgX, imgY, span, rgba, GL_RGBA);
}
void
_swrast_write_zoomed_rgb_span(struct gl_context *ctx, GLint imgX, GLint imgY,
const SWspan *span, const GLvoid *rgb)
{
zoom_span(ctx, imgX, imgY, span, rgb, GL_RGB);
}
void
_swrast_write_zoomed_depth_span(struct gl_context *ctx, GLint imgX, GLint imgY,
const SWspan *span)
{
zoom_span(ctx, imgX, imgY, span,
(const GLvoid *) span->array->z, GL_DEPTH_COMPONENT);
}
/**
* Zoom/write stencil values.
* No per-fragment operations are applied.
*/
void
_swrast_write_zoomed_stencil_span(struct gl_context *ctx, GLint imgX, GLint imgY,
GLint width, GLint spanX, GLint spanY,
const GLubyte stencil[])
{
GLubyte zoomedVals[MAX_WIDTH];
GLint x0, x1, y0, y1, y;
GLint i, zoomedWidth;
if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
&x0, &x1, &y0, &y1)) {
return; /* totally clipped */
}
zoomedWidth = x1 - x0;
ASSERT(zoomedWidth > 0);
ASSERT(zoomedWidth <= MAX_WIDTH);
/* zoom the span horizontally */
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
ASSERT(j >= 0);
ASSERT(j < width);
zoomedVals[i] = stencil[j];
}
/* write the zoomed spans */
for (y = y0; y < y1; y++) {
_swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals);
}
}
/**
* Zoom/write 32-bit Z values.
* No per-fragment operations are applied.
*/
void
_swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY,
GLint width, GLint spanX, GLint spanY,
const GLuint *zVals)
{
struct gl_renderbuffer *rb =
ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
GLuint zoomedVals[MAX_WIDTH];
GLint x0, x1, y0, y1, y;
GLint i, zoomedWidth;
if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
&x0, &x1, &y0, &y1)) {
return; /* totally clipped */
}
zoomedWidth = x1 - x0;
ASSERT(zoomedWidth > 0);
ASSERT(zoomedWidth <= MAX_WIDTH);
/* zoom the span horizontally */
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
ASSERT(j >= 0);
ASSERT(j < width);
zoomedVals[i] = zVals[j];
}
/* write the zoomed spans */
for (y = y0; y < y1; y++) {
GLubyte *dst = _swrast_pixel_address(rb, x0, y);
_mesa_pack_uint_z_row(rb->Format, zoomedWidth, zoomedVals, dst);
}
}
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