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/* |
* Mesa 3-D graphics library |
* |
* 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 |
* THE AUTHORS OR COPYRIGHT HOLDERS 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 "main/glheader.h" |
#include "main/macros.h" |
#include "main/imports.h" |
#include "main/format_pack.h" |
|
#include "s_context.h" |
#include "s_span.h" |
#include "s_stencil.h" |
#include "s_zoom.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(1, sizeof(SWspanarrays)); |
if (!swrast->ZoomedArrays) |
return; |
} |
|
zoomedWidth = x1 - x0; |
assert(zoomedWidth > 0); |
assert(zoomedWidth <= SWRAST_MAX_WIDTH); |
|
/* no pixel arrays! must be horizontal spans. */ |
assert((span->arrayMask & SPAN_XY) == 0); |
assert(span->primitive == GL_BITMAP); |
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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[VARYING_SLOT_COL0]; |
|
COPY_4V(zoomed.attrStart[VARYING_SLOT_POS], span->attrStart[VARYING_SLOT_POS]); |
COPY_4V(zoomed.attrStepX[VARYING_SLOT_POS], span->attrStepX[VARYING_SLOT_POS]); |
COPY_4V(zoomed.attrStepY[VARYING_SLOT_POS], span->attrStepY[VARYING_SLOT_POS]); |
|
zoomed.attrStart[VARYING_SLOT_FOGC][0] = span->attrStart[VARYING_SLOT_FOGC][0]; |
zoomed.attrStepX[VARYING_SLOT_FOGC][0] = span->attrStepX[VARYING_SLOT_FOGC][0]; |
zoomed.attrStepY[VARYING_SLOT_FOGC][0] = span->attrStepY[VARYING_SLOT_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 |= VARYING_BIT_COL0; /* 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 < (GLint) span->end); |
COPY_4V(zoomed.array->attribs[VARYING_SLOT_COL0][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 < (GLint) span->end); |
zoomed.array->attribs[VARYING_SLOT_COL0][i][0] = rgb[j][0]; |
zoomed.array->attribs[VARYING_SLOT_COL0][i][1] = rgb[j][1]; |
zoomed.array->attribs[VARYING_SLOT_COL0][i][2] = rgb[j][2]; |
zoomed.array->attribs[VARYING_SLOT_COL0][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); |
} |
} |
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free(rgbaSave); |
} |
} |
|
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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); |
} |
|
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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; |
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 <= SWRAST_MAX_WIDTH); |
|
zoomedVals = malloc(zoomedWidth * sizeof(GLubyte)); |
if (!zoomedVals) |
return; |
|
/* 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); |
} |
|
free(zoomedVals); |
} |
|
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/** |
* 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; |
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 <= SWRAST_MAX_WIDTH); |
|
zoomedVals = malloc(zoomedWidth * sizeof(GLuint)); |
if (!zoomedVals) |
return; |
|
/* 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); |
} |
|
free(zoomedVals); |
} |