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readpixels handles any format/type/packing/transfer ops now

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This commit is contained in:
Brian
2007-08-10 15:29:41 -06:00
parent bc4aa83794
commit 04ee3cecdf
1 changed files with 56 additions and 10 deletions
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66
src/mesa/state_tracker/st_cb_readpixels.c
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@@ -35,6 +35,7 @@
#include "main/imports.h"
#include "main/context.h"
#include "main/image.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
@@ -45,30 +46,75 @@
#include "st_public.h"
/**
* Do glReadPixels by getting rows from the framebuffer surface with
* get_tile(). Convert to requested format/type with Mesa image routines.
* Image transfer ops are done in software too.
*/
static void
st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
const struct gl_pixelstore_attrib *pack,
GLvoid *dest)
{
struct pipe_context *pipe = ctx->st->pipe;
GLfloat temp[MAX_WIDTH][4];
const GLbitfield transferOps = ctx->_ImageTransferState;
GLint i, yInv, dfStride;
GLfloat *df;
struct st_renderbuffer *strb;
struct gl_pixelstore_attrib clippedPacking = *pack;
/* XXX convolution not done yet */
assert((transferOps & IMAGE_CONVOLUTION_BIT) == 0);
/* Do all needed clipping here, so that we can forget about it later */
if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
/* The ReadPixels region is totally outside the window bounds */
return;
}
/* XXX check pack->BufferObj !!! */
strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
if (!strb)
return;
pipe->region_map(pipe, strb->surface->region);
if (format == GL_RGBA && type == GL_FLOAT) {
struct st_renderbuffer *strb
= st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
if (!strb)
return;
pipe->region_map(pipe, strb->surface->region);
strb->surface->get_tile(strb->surface, x, y, width, height, dest);
pipe->region_unmap(pipe, strb->surface->region);
/* write tile(row) directly into user's buffer */
df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, 0, 0);
dfStride = width * 4;
}
else {
assert(0);
/* write tile(row) into temp row buffer */
df = (GLfloat *) temp;
dfStride = 0;
}
/* Do a row at a time to flip image data vertically */
yInv = strb->Base.Height - 1 - y;
for (i = 0; i < height; i++) {
strb->surface->get_tile(strb->surface, x, yInv, width, 1, df);
yInv--;
df += dfStride;
if (!dfStride) {
/* convert GLfloat to user's format/type */
GLvoid *dst = _mesa_image_address2d(&clippedPacking, dest, width,
height, format, type, i, 0);
_mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
&clippedPacking, transferOps);
}
}
pipe->region_unmap(pipe, strb->surface->region);
}
void st_init_readpixels_functions(struct dd_function_table *functions)
{
functions->ReadPixels = st_readpixels;