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Diffstat (limited to 'src/mesa/state_tracker/st_cb_readpixels.c')
-rw-r--r--src/mesa/state_tracker/st_cb_readpixels.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
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+++ b/src/mesa/state_tracker/st_cb_readpixels.c
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+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+
+/**
+ * glReadPixels interface to pipe
+ *
+ * \author Brian Paul
+ */
+
+
+#include "main/imports.h"
+#include "main/bufferobj.h"
+#include "main/context.h"
+#include "main/image.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_inlines.h"
+#include "util/u_tile.h"
+#include "st_context.h"
+#include "st_cb_bitmap.h"
+#include "st_cb_readpixels.h"
+#include "st_cb_fbo.h"
+#include "st_format.h"
+#include "st_public.h"
+
+
+/**
+ * Special case for reading stencil buffer.
+ * For color/depth we use get_tile(). For stencil, map the stencil buffer.
+ */
+void
+st_read_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height, GLenum type,
+ const struct gl_pixelstore_attrib *packing,
+ GLvoid *pixels)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct pipe_screen *screen = ctx->st->pipe->screen;
+ struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
+ struct pipe_surface *ps;
+ ubyte *stmap;
+ GLint j;
+
+ /* Create a CPU-READ surface/view into the renderbuffer's texture */
+ ps = screen->get_tex_surface(screen, strb->texture, 0, 0, 0,
+ PIPE_BUFFER_USAGE_CPU_READ);
+
+ /* map the stencil buffer */
+ stmap = screen->surface_map(screen, ps, PIPE_BUFFER_USAGE_CPU_READ);
+
+ /* width should never be > MAX_WIDTH since we did clipping earlier */
+ ASSERT(width <= MAX_WIDTH);
+
+ /* process image row by row */
+ for (j = 0; j < height; j++, y++) {
+ GLvoid *dest;
+ GLstencil values[MAX_WIDTH];
+ GLint srcY;
+
+ if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+ srcY = ctx->DrawBuffer->Height - y - 1;
+ }
+ else {
+ srcY = y;
+ }
+
+ /* get stencil values */
+ switch (ps->format) {
+ case PIPE_FORMAT_S8_UNORM:
+ {
+ const ubyte *src = stmap + srcY * ps->stride + x;
+ memcpy(values, src, width);
+ }
+ break;
+ case PIPE_FORMAT_S8Z24_UNORM:
+ {
+ const uint *src = (uint *) (stmap + srcY * ps->stride + x*4);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ values[k] = src[k] >> 24;
+ }
+ }
+ break;
+ case PIPE_FORMAT_Z24S8_UNORM:
+ {
+ const uint *src = (uint *) (stmap + srcY * ps->stride + x*4);
+ GLint k;
+ for (k = 0; k < width; k++) {
+ values[k] = src[k] & 0xff;
+ }
+ }
+ break;
+ default:
+ assert(0);
+ }
+
+ /* store */
+ dest = _mesa_image_address2d(packing, pixels, width, height,
+ GL_STENCIL_INDEX, type, j, 0);
+
+ _mesa_pack_stencil_span(ctx, width, type, dest, values, packing);
+ }
+
+
+ /* unmap the stencil buffer */
+ screen->surface_unmap(screen, ps);
+ pipe_surface_reference(&ps, NULL);
+}
+
+
+/**
+ * Return renderbuffer to use for reading color pixels for glRead/CopyPixel
+ * commands.
+ * Special care is needed for the front buffer.
+ */
+struct st_renderbuffer *
+st_get_color_read_renderbuffer(GLcontext *ctx)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct st_renderbuffer *strb =
+ st_renderbuffer(fb->_ColorReadBuffer);
+ struct st_renderbuffer *front =
+ st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
+
+ if (strb == front
+ && ctx->st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) {
+ /* reading from front color buffer, which is a logical copy of the
+ * back color buffer.
+ */
+ struct st_renderbuffer *back =
+ st_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
+ strb = back;
+ }
+
+ return strb;
+}
+
+
+/**
+ * Try to do glReadPixels in a fast manner for common cases.
+ * \return GL_TRUE for success, GL_FALSE for failure
+ */
+static GLboolean
+st_fast_readpixels(GLcontext *ctx, struct st_renderbuffer *strb,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *pack,
+ GLvoid *dest)
+{
+ enum combination {
+ A8R8G8B8_UNORM_TO_RGBA_UBYTE,
+ A8R8G8B8_UNORM_TO_RGB_UBYTE,
+ A8R8G8B8_UNORM_TO_BGRA_UINT
+ } combo;
+
+ if (ctx->_ImageTransferState)
+ return GL_FALSE;
+
+ if (strb->format == PIPE_FORMAT_A8R8G8B8_UNORM &&
+ format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
+ combo = A8R8G8B8_UNORM_TO_RGBA_UBYTE;
+ }
+ else if (strb->format == PIPE_FORMAT_A8R8G8B8_UNORM &&
+ format == GL_RGB && type == GL_UNSIGNED_BYTE) {
+ combo = A8R8G8B8_UNORM_TO_RGB_UBYTE;
+ }
+ else if (strb->format == PIPE_FORMAT_A8R8G8B8_UNORM &&
+ format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {
+ combo = A8R8G8B8_UNORM_TO_BGRA_UINT;
+ }
+ else {
+ return GL_FALSE;
+ }
+
+ /*printf("st_fast_readpixels combo %d\n", (GLint) combo);*/
+
+ {
+ struct pipe_context *pipe = ctx->st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ struct pipe_surface *surf;
+ const GLubyte *map;
+ GLubyte *dst;
+ GLint row, col, dy, dstStride;
+
+ surf = screen->get_tex_surface(screen, strb->texture, 0, 0, 0,
+ PIPE_BUFFER_USAGE_CPU_READ);
+ if (!surf) {
+ return GL_FALSE;
+ }
+
+ map = screen->surface_map(screen, surf, PIPE_BUFFER_USAGE_CPU_READ);
+ if (!map) {
+ pipe_surface_reference(&surf, NULL);
+ return GL_FALSE;
+ }
+
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ y = surf->height - y - 1;
+ dy = -1;
+ }
+ else {
+ dy = 1;
+ }
+
+ dst = _mesa_image_address2d(pack, dest, width, height,
+ format, type, 0, 0);
+ dstStride = _mesa_image_row_stride(pack, width, format, type);
+
+ switch (combo) {
+ case A8R8G8B8_UNORM_TO_RGBA_UBYTE:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * surf->stride + x * 4;
+ for (col = 0; col < width; col++) {
+ GLuint pixel = ((GLuint *) src)[col];
+ dst[col*4+0] = (pixel >> 16) & 0xff;
+ dst[col*4+1] = (pixel >> 8) & 0xff;
+ dst[col*4+2] = (pixel >> 0) & 0xff;
+ dst[col*4+3] = (pixel >> 24) & 0xff;
+ }
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ case A8R8G8B8_UNORM_TO_RGB_UBYTE:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * surf->stride + x * 4;
+ for (col = 0; col < width; col++) {
+ GLuint pixel = ((GLuint *) src)[col];
+ dst[col*3+0] = (pixel >> 16) & 0xff;
+ dst[col*3+1] = (pixel >> 8) & 0xff;
+ dst[col*3+2] = (pixel >> 0) & 0xff;
+ }
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ case A8R8G8B8_UNORM_TO_BGRA_UINT:
+ for (row = 0; row < height; row++) {
+ const GLubyte *src = map + y * surf->stride + x * 4;
+ memcpy(dst, src, 4 * width);
+ dst += dstStride;
+ y += dy;
+ }
+ break;
+ default:
+ ; /* nothing */
+ }
+
+ screen->surface_unmap(screen, surf);
+ pipe_surface_reference(&surf, NULL);
+ }
+
+ return GL_TRUE;
+}
+
+
+/**
+ * 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 *pack,
+ GLvoid *dest)
+{
+ struct pipe_context *pipe = ctx->st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ GLfloat temp[MAX_WIDTH][4];
+ const GLbitfield transferOps = ctx->_ImageTransferState;
+ GLsizei i, j;
+ GLint yStep, dfStride;
+ GLfloat *df;
+ struct st_renderbuffer *strb;
+ struct gl_pixelstore_attrib clippedPacking = *pack;
+ struct pipe_surface *surf;
+
+ assert(ctx->ReadBuffer->Width > 0);
+
+ /* 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 surface is totally outside the window bounds */
+ return;
+ }
+
+ dest = _mesa_map_readpix_pbo(ctx, &clippedPacking, dest);
+ if (!dest)
+ return;
+
+ /* make sure rendering has completed */
+ st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
+
+ if (format == GL_STENCIL_INDEX) {
+ st_read_stencil_pixels(ctx, x, y, width, height, type, pack, dest);
+ return;
+ }
+ else if (format == GL_DEPTH_COMPONENT) {
+ strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
+ }
+ else {
+ /* Read color buffer */
+ strb = st_get_color_read_renderbuffer(ctx);
+ }
+
+ if (!strb)
+ return;
+
+ /* try a fast-path readpixels before anything else */
+ if (st_fast_readpixels(ctx, strb, x, y, width, height,
+ format, type, pack, dest)) {
+ /* success! */
+ _mesa_unmap_readpix_pbo(ctx, &clippedPacking);
+ return;
+ }
+
+ if (format == GL_RGBA && type == GL_FLOAT) {
+ /* 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 {
+ /* write tile(row) into temp row buffer */
+ df = (GLfloat *) temp;
+ dfStride = 0;
+ }
+
+ /* determine bottom-to-top vs. top-to-bottom order */
+ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
+ y = strb->Base.Height - 1 - y;
+ yStep = -1;
+ }
+ else {
+ yStep = 1;
+ }
+
+ /* Create a CPU-READ surface/view into the renderbuffer's texture */
+ surf = screen->get_tex_surface(screen, strb->texture, 0, 0, 0,
+ PIPE_BUFFER_USAGE_CPU_READ);
+
+ /*
+ * Copy pixels from pipe_surface to user memory
+ */
+ {
+ /* dest of first pixel in client memory */
+ GLubyte *dst = _mesa_image_address2d(&clippedPacking, dest, width,
+ height, format, type, 0, 0);
+ /* dest row stride */
+ const GLint dstStride = _mesa_image_row_stride(&clippedPacking, width,
+ format, type);
+
+ if (surf->format == PIPE_FORMAT_S8Z24_UNORM ||
+ surf->format == PIPE_FORMAT_X8Z24_UNORM) {
+ if (format == GL_DEPTH_COMPONENT) {
+ for (i = 0; i < height; i++) {
+ GLuint ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / ((1 << 24) - 1);
+ pipe_get_tile_raw(surf, x, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * (ztemp[j] & 0xffffff));
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else {
+ /* untested, but simple: */
+ assert(format == GL_DEPTH_STENCIL_EXT);
+ for (i = 0; i < height; i++) {
+ pipe_get_tile_raw(surf, x, y, width, 1, dst, 0);
+ y += yStep;
+ dst += dstStride;
+ }
+ }
+ }
+ else if (surf->format == PIPE_FORMAT_Z16_UNORM) {
+ for (i = 0; i < height; i++) {
+ GLushort ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / 0xffff;
+ pipe_get_tile_raw(surf, x, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * ztemp[j]);
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else if (surf->format == PIPE_FORMAT_Z32_UNORM) {
+ for (i = 0; i < height; i++) {
+ GLuint ztemp[MAX_WIDTH];
+ GLfloat zfloat[MAX_WIDTH];
+ const double scale = 1.0 / 0xffffffff;
+ pipe_get_tile_raw(surf, x, y, width, 1, ztemp, 0);
+ y += yStep;
+ for (j = 0; j < width; j++) {
+ zfloat[j] = (float) (scale * ztemp[j]);
+ }
+ _mesa_pack_depth_span(ctx, width, dst, type,
+ zfloat, &clippedPacking);
+ dst += dstStride;
+ }
+ }
+ else {
+ /* RGBA format */
+ /* Do a row at a time to flip image data vertically */
+ for (i = 0; i < height; i++) {
+ pipe_get_tile_rgba(surf, x, y, width, 1, df);
+ y += yStep;
+ df += dfStride;
+ if (!dfStride) {
+ _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
+ &clippedPacking, transferOps);
+ dst += dstStride;
+ }
+ }
+ }
+ }
+
+ pipe_surface_reference(&surf, NULL);
+
+ _mesa_unmap_readpix_pbo(ctx, &clippedPacking);
+}
+
+
+void st_init_readpixels_functions(struct dd_function_table *functions)
+{
+ functions->ReadPixels = st_readpixels;
+}
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