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* clutter/cogl/gles/cogl-texture.c:
(cogl_texture_download_from_gl:) Implemented a workaround for missing alpha framebuffer channel. There are still some issues with detecting whether alpha is present in the framebuffer. See comments in code. Test-cogl-tex-getset now successfully retrieves a RGBA texture image data.
This commit is contained in:
Ivan Leben
parent
3d9f83019d
commit
2008a03a6b
@ -1,3 +1,12 @@
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2008-05-20 Ivan Leben <ivan@o-hand.com>
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* clutter/cogl/gles/cogl-texture.c:
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(cogl_texture_download_from_gl:) Implemented a workaround
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for missing alpha framebuffer channel. There are still
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some issues with detecting whether alpha is present in the
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framebuffer. See comments in code. Test-cogl-tex-getset now
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successfully retrieves a RGBA texture image data.
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2008-05-19 Ivan Leben <ivan@o-hand.com>
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* clutter/cogl/gles/cogl-texture.c:
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@ -238,6 +238,125 @@ _cogl_texture_upload_to_gl (CoglTexture *tex)
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return TRUE;
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}
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static void
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_cogl_texture_draw_and_read (CoglTexture *tex,
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CoglBitmap *target_bmp,
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ClutterColor *back_color,
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GLint *viewport)
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{
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gint bpp;
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ClutterFixed rx1, ry1;
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ClutterFixed rx2, ry2;
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ClutterFixed tx1, ty1;
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ClutterFixed tx2, ty2;
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int bw, bh;
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CoglBitmap rect_bmp;
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CoglHandle handle;
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handle = _cogl_texture_handle_from_pointer (tex);
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bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
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/* If whole image fits into the viewport and target buffer
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has got no special rowstride, we can do it in one pass */
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if (tex->bitmap.width < viewport[2] - viewport[0] &&
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tex->bitmap.height < viewport[3] - viewport[1] &&
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tex->bitmap.rowstride == bpp * tex->bitmap.width)
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{
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/* Clear buffer with transparent black, draw with white
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for direct copy to framebuffer */
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cogl_paint_init (back_color);
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/* Draw the texture image */
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cogl_texture_rectangle (handle,
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0, 0,
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CLUTTER_INT_TO_FIXED (tex->bitmap.width),
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CLUTTER_INT_TO_FIXED (tex->bitmap.height),
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0, 0, CFX_ONE, CFX_ONE);
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/* Read into target bitmap */
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GE( glPixelStorei (GL_PACK_ALIGNMENT, 1) );
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GE( glReadPixels (viewport[0], viewport[1],
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tex->bitmap.width,
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tex->bitmap.height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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target_bmp->data) );
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}
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else
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{
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ry1 = 0; ry2 = 0;
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ty1 = 0; ty2 = 0;
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#define CFIX CLUTTER_INT_TO_FIXED
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/* Walk Y axis until whole bitmap height consumed */
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for (bh = tex->bitmap.height; bh > 0; bh -= viewport[3])
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{
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/* Rectangle Y coords */
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ry1 = ry2;
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ry2 += (bh < viewport[3]) ? bh : viewport[3];
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/* Normalized texture Y coords */
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ty1 = ty2;
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ty2 = CFX_QDIV (CFIX (ry2), CFIX (tex->bitmap.height));
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rx1 = 0; rx2 = 0;
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tx1 = 0; tx2 = 0;
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/* Walk X axis until whole bitmap width consumed */
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for (bw = tex->bitmap.width; bw > 0; bw-=viewport[2])
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{
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/* Rectangle X coords */
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rx1 = rx2;
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rx2 += (bw < viewport[2]) ? bw : viewport[2];
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/* Normalized texture X coords */
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tx1 = tx2;
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tx2 = CFX_QDIV (CFIX (rx2), CFIX (tex->bitmap.width));
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/* Clear buffer with transparent black, draw with white
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for direct copy to framebuffer */
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cogl_paint_init (back_color);
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/* Draw a portion of texture */
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cogl_texture_rectangle (handle,
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0, 0,
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CFIX (rx2 - rx1),
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CFIX (ry2 - ry1),
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tx1, ty1,
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tx2, ty2);
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/* Read into a temporary bitmap */
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rect_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
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rect_bmp.width = rx2 - rx1;
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rect_bmp.height = ry2 - ry1;
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rect_bmp.rowstride = bpp * rect_bmp.width;
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rect_bmp.data = (guchar*) g_malloc (rect_bmp.rowstride *
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rect_bmp.height);
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GE( glPixelStorei (GL_PACK_ALIGNMENT, 1) );
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GE( glReadPixels (viewport[0], viewport[1],
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rect_bmp.width,
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rect_bmp.height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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rect_bmp.data) );
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/* Copy to target bitmap */
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_cogl_bitmap_copy_subregion (&rect_bmp,
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target_bmp,
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0,0,
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rx1,ry1,
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rect_bmp.width,
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rect_bmp.height);
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/* Free temp bitmap */
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g_free (rect_bmp.data);
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}
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}
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#undef CFIX
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}
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}
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static gboolean
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_cogl_texture_download_from_gl (CoglTexture *tex,
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CoglBitmap *target_bmp,
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@ -246,21 +365,13 @@ _cogl_texture_download_from_gl (CoglTexture *tex,
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{
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gint bpp;
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GLint viewport[4];
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CoglHandle handle;
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ClutterColor cback = {0x0, 0x0, 0x0, 0x0};
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ClutterColor cwhite = {0xFF, 0xFF, 0xFF, 0xFF};
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CoglBitmap rect_bmp;
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ClutterFixed rx1, ry1;
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ClutterFixed rx2, ry2;
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ClutterFixed tx1, ty1;
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ClutterFixed tx2, ty2;
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int bw, bh;
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CoglBitmap alpha_bmp;
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COGLenum old_src_factor;
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COGLenum old_dst_factor;
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_COGL_GET_CONTEXT (ctx, FALSE);
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handle = _cogl_texture_handle_from_pointer (tex);
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bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
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/* Viewport needs to have some size and be inside the window for this */
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@ -290,113 +401,70 @@ _cogl_texture_download_from_gl (CoglTexture *tex,
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/* Draw to all channels */
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cogl_draw_buffer (COGL_WINDOW_BUFFER | COGL_MASK_BUFFER, 0);
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/* Store old blending factors and setup direct copy operation */
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/* Store old blending factors */
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old_src_factor = ctx->blend_src_factor;
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old_dst_factor = ctx->blend_dst_factor;
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/* Direct copy operation */
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cogl_color (&cwhite);
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cogl_blend_func (CGL_ONE, CGL_ZERO);
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_cogl_texture_draw_and_read (tex, target_bmp,
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&cwhite, viewport);
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/* If whole image fits into the viewport and target buffer
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has got no special rowstride, we can do it in one pass */
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if (tex->bitmap.width < viewport[2] - viewport[0] &&
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tex->bitmap.height < viewport[3] - viewport[1] &&
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tex->bitmap.rowstride == bpp * tex->bitmap.width)
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/* Check whether texture has alpha and framebuffer not */
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/* FIXME: For some reason even if ALPHA_BITS is 8, the framebuffer
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still doesn't seem to have an alpha buffer. This might be just
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a PowerVR issue.
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GLint r_bits, g_bits, b_bits, a_bits;
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GE( glGetIntegerv (GL_ALPHA_BITS, &a_bits) );
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GE( glGetIntegerv (GL_RED_BITS, &r_bits) );
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GE( glGetIntegerv (GL_GREEN_BITS, &g_bits) );
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GE( glGetIntegerv (GL_BLUE_BITS, &b_bits) );
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printf ("R bits: %d\n", r_bits);
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printf ("G bits: %d\n", g_bits);
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printf ("B bits: %d\n", b_bits);
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printf ("A bits: %d\n", a_bits);
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if ((tex->bitmap.format & COGL_A_BIT) && a_bits == 0) */
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{
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/* Clear buffer with transparent black, draw with white
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for direct copy to framebuffer */
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cogl_paint_init (&cback);
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cogl_color (&cwhite);
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guchar *srcdata;
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guchar *dstdata;
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guchar *srcpixel;
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guchar *dstpixel;
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gint x,y;
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/* Draw the texture image */
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cogl_texture_rectangle (handle,
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0, 0,
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CLUTTER_INT_TO_FIXED (tex->bitmap.width),
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CLUTTER_INT_TO_FIXED (tex->bitmap.height),
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0, 0, CFX_ONE, CFX_ONE);
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/* Create temp bitmap for alpha values */
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alpha_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
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alpha_bmp.width = target_bmp->width;
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alpha_bmp.height = target_bmp->height;
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alpha_bmp.rowstride = bpp * alpha_bmp.width;
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alpha_bmp.data = (guchar*) g_malloc (alpha_bmp.rowstride *
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alpha_bmp.height);
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/* Read into target bitmap */
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GE( glPixelStorei (GL_PACK_ALIGNMENT, 1) );
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GE( glReadPixels (viewport[0], viewport[1],
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tex->bitmap.width,
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tex->bitmap.height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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target_bmp->data) );
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}
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else
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{
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ry1 = 0; ry2 = 0;
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ty1 = 0; ty2 = 0;
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/* Draw alpha values into RGB channels */
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cogl_blend_func (CGL_ZERO, CGL_SRC_ALPHA);
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_cogl_texture_draw_and_read (tex, &alpha_bmp,
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&cwhite, viewport);
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#define CFIX CLUTTER_INT_TO_FIXED
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/* Copy temp R to target A */
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srcdata = alpha_bmp.data;
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dstdata = target_bmp->data;
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/* Walk Y axis until whole bitmap height consumed */
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for (bh = tex->bitmap.height; bh > 0; bh -= viewport[3])
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{
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/* Rectangle Y coords */
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ry1 = ry2;
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ry2 += (bh < viewport[3]) ? bh : viewport[3];
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/* Normalized texture Y coords */
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ty1 = ty2;
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ty2 = CFX_QDIV (CFIX (ry2), CFIX (tex->bitmap.height));
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rx1 = 0; rx2 = 0;
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tx1 = 0; tx2 = 0;
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/* Walk X axis until whole bitmap width consumed */
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for (bw = tex->bitmap.width; bw > 0; bw-=viewport[2])
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{
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/* Rectangle X coords */
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rx1 = rx2;
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rx2 += (bw < viewport[2]) ? bw : viewport[2];
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/* Normalized texture X coords */
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tx1 = tx2;
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tx2 = CFX_QDIV (CFIX (rx2), CFIX (tex->bitmap.width));
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/* Clear buffer with transparent black, draw with white
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for direct copy to framebuffer */
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cogl_paint_init (&cback);
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cogl_color (&cwhite);
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/* Draw a portion of texture */
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cogl_texture_rectangle (handle,
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0, 0,
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CFIX (rx2 - rx1),
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CFIX (ry2 - ry1),
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tx1, ty1,
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tx2, ty2);
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/* Read into a temporary bitmap */
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rect_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
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rect_bmp.width = rx2 - rx1;
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rect_bmp.height = ry2 - ry1;
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rect_bmp.rowstride = bpp * rect_bmp.width;
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rect_bmp.data = (guchar*) g_malloc (rect_bmp.rowstride *
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rect_bmp.height);
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GE( glPixelStorei (GL_PACK_ALIGNMENT, 1) );
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GE( glReadPixels (viewport[0], viewport[1],
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rect_bmp.width,
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rect_bmp.height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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rect_bmp.data) );
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/* Copy to target bitmap */
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_cogl_bitmap_copy_subregion (&rect_bmp,
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target_bmp,
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0,0,
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rx1,ry1,
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rect_bmp.width,
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rect_bmp.height);
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/* Free temp bitmap */
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g_free (rect_bmp.data);
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}
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}
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for (y=0; y<target_bmp->height; ++y)
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{
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for (x=0; x<target_bmp->width; ++x)
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{
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srcpixel = srcdata + x*bpp;
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dstpixel = dstdata + x*bpp;
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dstpixel[3] = srcpixel[0];
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}
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srcdata += alpha_bmp.rowstride;
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dstdata += target_bmp->rowstride;
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}
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#undef CFIX
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g_free (alpha_bmp.data);
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}
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/* Restore old state */
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glMatrixMode (GL_PROJECTION);
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glPopMatrix ();
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glMatrixMode (GL_MODELVIEW);
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