radeon: add hw accelerated glReadPixel support (not enabled yet)

src/mesa/drivers/dri/r200/Makefile

@@ -21,6 +21,7 @@ RADEON_COMMON_SOURCES = \
 	radeon_fbo.c \
 	radeon_lock.c \
 	radeon_mipmap_tree.c \
+	radeon_pixel_read.c \
 	radeon_queryobj.c \
 	radeon_span.c \
 	radeon_texture.c \

src/mesa/drivers/dri/r200/radeon_pixel_read.c

@@ -0,0 +1 @@
+../radeon/radeon_pixel_read.c

src/mesa/drivers/dri/r300/Makefile

@@ -31,8 +31,9 @@ RADEON_COMMON_SOURCES = \
 	radeon_fbo.c \
 	radeon_lock.c \
 	radeon_mipmap_tree.c \
-	radeon_span.c \
+	radeon_pixel_read.c \
 	radeon_queryobj.c \
+	radeon_span.c \
 	radeon_texture.c \
 	radeon_tex_copy.c \
 	radeon_tex_getimage.c \

src/mesa/drivers/dri/r300/radeon_pixel_read.c

@@ -0,0 +1 @@
+../radeon/radeon_pixel_read.c

src/mesa/drivers/dri/r600/Makefile

@@ -31,9 +31,10 @@ RADEON_COMMON_SOURCES = \
 	radeon_fbo.c \
 	radeon_lock.c \
 	radeon_mipmap_tree.c \
+	radeon_pixel_read.c \
+	radeon_queryobj.c \
 	radeon_span.c \
 	radeon_texture.c \
-	radeon_queryobj.c \
 	radeon_tex_copy.c \
 	radeon_tex_getimage.c \
 	radeon_tile.c

src/mesa/drivers/dri/r600/radeon_pixel_read.c

@@ -0,0 +1 @@
+../radeon/radeon_pixel_read.c

src/mesa/drivers/dri/radeon/Makefile

@@ -22,6 +22,7 @@ RADEON_COMMON_SOURCES = \
 	radeon_fbo.c \
 	radeon_lock.c \
 	radeon_mipmap_tree.c \
+	radeon_pixel_read.c \
 	radeon_queryobj.c \
 	radeon_span.c \
 	radeon_texture.c \

src/mesa/drivers/dri/radeon/radeon_common.h

@@ -44,6 +44,12 @@ radeon_renderbuffer_set_bo(struct radeon_renderbuffer *rb,
 struct radeon_renderbuffer *
 radeon_create_renderbuffer(gl_format format, __DRIdrawable *driDrawPriv);
 
+void
+radeonReadPixels(GLcontext * ctx,
+				GLint x, GLint y, GLsizei width, GLsizei height,
+				GLenum format, GLenum type,
+				const struct gl_pixelstore_attrib *pack, GLvoid * pixels);
+
 void radeon_check_front_buffer_rendering(GLcontext *ctx);
 static inline struct radeon_renderbuffer *radeon_renderbuffer(struct gl_renderbuffer *rb)
 {

src/mesa/drivers/dri/radeon/radeon_pixel_read.c

@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2010 Maciej Cencora <m.cencora@gmail.com>
+ *
+ * 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 (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 NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) 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.
+ *
+ */
+
+#include "stdint.h"
+#include "main/bufferobj.h"
+#include "main/enums.h"
+#include "main/image.h"
+#include "main/state.h"
+#include "swrast/swrast.h"
+
+#include "radeon_common_context.h"
+#include "radeon_debug.h"
+#include "radeon_mipmap_tree.h"
+
+static gl_format gl_format_and_type_to_mesa_format(GLenum format, GLenum type)
+{
+    switch (format)
+    {
+        case GL_RGB:
+            switch (type) {
+                case GL_UNSIGNED_SHORT_5_6_5:
+                    return MESA_FORMAT_RGB565;
+                case GL_UNSIGNED_SHORT_5_6_5_REV:
+                    return MESA_FORMAT_RGB565_REV;
+            }
+            break;
+        case GL_RGBA:
+            switch (type) {
+                case GL_UNSIGNED_BYTE:
+                    return MESA_FORMAT_RGBA8888_REV;
+                case GL_FLOAT:
+                    return MESA_FORMAT_RGBA_FLOAT32;
+                case GL_UNSIGNED_SHORT_4_4_4_4:
+                    return MESA_FORMAT_ARGB4444;
+                case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+                    return MESA_FORMAT_ARGB4444;
+                case GL_UNSIGNED_SHORT_5_5_5_1:
+                    return MESA_FORMAT_RGBA5551;
+                case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+                    return MESA_FORMAT_ARGB1555_REV;
+                case GL_UNSIGNED_INT_8_8_8_8:
+                    return MESA_FORMAT_ARGB8888;
+                case GL_UNSIGNED_INT_8_8_8_8_REV:
+                    return MESA_FORMAT_ARGB8888_REV;
+            }
+            break;
+    }
+
+    return MESA_FORMAT_NONE;
+}
+
+static GLboolean
+do_blit_readpixels(GLcontext * ctx,
+                   GLint x, GLint y, GLsizei width, GLsizei height,
+                   GLenum format, GLenum type,
+                   const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
+{
+    radeonContextPtr radeon = RADEON_CONTEXT(ctx);
+    const struct radeon_renderbuffer *rrb = radeon_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
+    const gl_format dst_format = gl_format_and_type_to_mesa_format(format, type);
+    unsigned dst_rowstride, dst_imagesize, aligned_rowstride, flip_y;
+    struct radeon_bo *dst_buffer;
+    GLint dst_x = 0, dst_y = 0;
+
+    /* It's not worth if number of pixels to copy is really small */
+    if (width * height < 100) {
+        return GL_FALSE;
+    }
+
+    if (dst_format == MESA_FORMAT_NONE ||
+        !radeon->vtbl.check_blit(dst_format) || !radeon->vtbl.blit) {
+        return GL_FALSE;
+    }
+
+    if (ctx->_ImageTransferState) {
+        return GL_FALSE;
+    }
+
+    if (pack->SwapBytes || pack->LsbFirst) {
+        return GL_FALSE;
+    }
+
+    if (pack->RowLength > 0) {
+        dst_rowstride = pack->RowLength;
+    } else {
+        dst_rowstride = width;
+    }
+
+    if (!_mesa_clip_copytexsubimage(ctx, &dst_x, &dst_y, &x, &y, &width, &height)) {
+        return GL_TRUE;
+    }
+    assert(x >= 0 && y >= 0);
+
+    aligned_rowstride = get_texture_image_row_stride(radeon, dst_format, dst_rowstride, 0);
+    dst_imagesize = get_texture_image_size(dst_format,
+                                           aligned_rowstride,
+                                           height, 1, 0);
+    dst_buffer = radeon_bo_open(radeon->radeonScreen->bom, 0, dst_imagesize, 1024, RADEON_GEM_DOMAIN_GTT, 0);
+
+    /* Disable source Y flipping for FBOs */
+    flip_y = (ctx->ReadBuffer->Name == 0);
+    if (pack->Invert) {
+        y = rrb->base.Height - height - y;
+        flip_y = !flip_y;
+    }
+
+    if (radeon->vtbl.blit(ctx,
+                          rrb->bo,
+                          rrb->draw_offset,
+                          rrb->base.Format,
+                          rrb->pitch / rrb->cpp,
+                          rrb->base.Width,
+                          rrb->base.Height,
+                          x,
+                          y,
+                          dst_buffer,
+                          0, /* dst_offset */
+                          dst_format,
+                          aligned_rowstride / _mesa_get_format_bytes(dst_format),
+                          width,
+                          height,
+                          0, /* dst_x */
+                          0, /* dst_y */
+                          width,
+                          height,
+                          flip_y))
+    {
+        radeon_bo_map(dst_buffer, 0);
+        dst_rowstride *= _mesa_get_format_bytes(dst_format);
+        copy_rows(pixels, dst_rowstride, dst_buffer->ptr,
+                  aligned_rowstride, height, dst_rowstride);
+        radeon_bo_unmap(dst_buffer);
+        radeon_bo_unref(dst_buffer);
+        return GL_TRUE;
+    } else {
+        radeon_bo_unref(dst_buffer);
+        return GL_FALSE;
+    }
+}
+
+void
+radeonReadPixels(GLcontext * ctx,
+                 GLint x, GLint y, GLsizei width, GLsizei height,
+                 GLenum format, GLenum type,
+                 const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
+{
+    if (do_blit_readpixels(ctx, x, y, width, height, format, type, pack, pixels))
+        return;
+
+    /* Update Mesa state before calling down into _swrast_ReadPixels, as
+     * the spans code requires the computed buffer states to be up to date,
+     * but _swrast_ReadPixels only updates Mesa state after setting up
+     * the spans code.
+     */
+
+    radeon_print(RADEON_FALLBACKS, RADEON_NORMAL,
+                 "Falling back to sw for ReadPixels (format %s, type %s)\n",
+                 _mesa_lookup_enum_by_nr(format), _mesa_lookup_enum_by_nr(type));
+
+    if (ctx->NewState)
+        _mesa_update_state(ctx);
+
+    _swrast_ReadPixels(ctx, x, y, width, height, format, type, pack, pixels);
+}