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start implementing glCopyPixels (stencil works)

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This commit is contained in:
Brian
2007-10-18 12:31:35 -06:00
parent 8f3fb395ff
commit bdc574c5bd
1 changed files with 79 additions and 0 deletions
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src/mesa/state_tracker/st_cb_drawpixels.c
+79
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@@ -40,6 +40,8 @@
#include "st_draw.h"
#include "st_program.h"
#include "st_cb_drawpixels.h"
#include "st_cb_readpixels.h"
#include "st_cb_fbo.h"
#include "st_cb_texture.h"
#include "st_draw.h"
#include "st_format.h"
@@ -1058,6 +1060,78 @@ st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
}
static void
copy_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLsizei width, GLsizei height,
GLint dstx, GLint dsty)
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = st->pipe;
struct st_renderbuffer *rbRead = st_renderbuffer(ctx->ReadBuffer->_StencilBuffer);
struct st_renderbuffer *rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);
struct pipe_surface *psRead = rbRead->surface;
struct pipe_surface *psDraw = rbDraw->surface;
ubyte *readMap, *drawMap;
ubyte *buffer;
int i;
buffer = malloc(width * height * sizeof(ubyte));
if (!buffer) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");
return;
}
/* map the stencil buffers */
readMap = pipe->region_map(pipe, psRead->region);
drawMap = pipe->region_map(pipe, psDraw->region);
/* this will do stencil pixel transfer ops */
st_read_stencil_pixels(ctx, srcx, srcy, width, height, GL_UNSIGNED_BYTE,
&ctx->DefaultPacking, buffer);
/* draw */
/* XXX PixelZoom not handled yet */
for (i = 0; i < height; i++) {
ubyte *dst;
const ubyte *src;
int y;
y = dsty + i;
if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
y = ctx->DrawBuffer->Height - y - 1;
}
dst = drawMap + (y * psDraw->region->pitch + dstx) * psDraw->region->cpp;
src = buffer + i * width;
switch (psDraw->format) {
case PIPE_FORMAT_S8_Z24:
{
uint *dst4 = (uint *) dst;
int j;
for (j = 0; j < width; j++) {
*dst4 = (*dst4 & 0xffffff) | (src[j] << 24);
dst4++;
}
}
break;
case PIPE_FORMAT_U_S8:
memcpy(dst, src, width);
break;
default:
assert(0);
}
}
free(buffer);
/* unmap the stencil buffers */
pipe->region_unmap(pipe, psRead->region);
pipe->region_unmap(pipe, psDraw->region);
}
static void
st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLsizei width, GLsizei height,
@@ -1067,6 +1141,11 @@ st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
st_validate_state(st);
if (type == GL_STENCIL) {
copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);
return;
}
/* allocate a texture of size width x height */
/* blit/copy framebuffer region into texture */