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glcolrconvert: fix YUY2 download

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- The shader was outputing the wrong values compared with raw
  videotestsrc.
- deal with the texture edge properly.
- properly sample the 2x1 rectangle for the u and v values
- don't double sample the y value
This commit is contained in:
Matthew Waters 2014-10-07 22:50:22 +11:00
parent 778b1814a8
commit 2fb0b28f74
1 changed files with 24 additions and 17 deletions
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41
gst-libs/gst/gl/gstglcolorconvert.c
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@ -326,25 +326,32 @@ static const gchar frag_RGB_to_YUY2_UYVY[] =
"void main(void) {\n"
" vec4 texel1, texel2;\n"
" vec2 texel3;\n"
" float fx, fy, y1, y2, u, v;\n"
" fx = v_texcoord.x;\n"
" fy = v_texcoord.y;\n"
" float fx, dx, fy, y, u, u1, u2, v, v1, v2;\n"
" float inorder = mod (v_texcoord.x * width, 2.0);\n"
" texel1 = texture2D(tex, vec2(fx, fy)).%c%c%c%c;\n"
" texel2 = texture2D(tex, vec2(fx+1.0 / width, fy)).%c%c%c%c;\n"
" y1 = dot(texel1.rgb, coeff1);\n"
" y2 = dot(texel2.rgb, coeff1);\n"
" u = dot(texel1.rgb, coeff2);\n"
" v = dot(texel1.rgb, coeff3);\n"
" y1 += offset.x;\n"
" y2 += offset.x;\n"
" u += offset.y;\n"
" v += offset.z;\n"
" fx = v_texcoord.x;\n"
" dx = 1.0 / width;\n"
" if (v_texcoord.x >= (1.0 - 0.5 * dx) || (v_texcoord.x > 0.5 * dx && inorder < 1.0)) {\n"
" dx = -dx;\n"
" }\n"
" fy = v_texcoord.y;\n"
" texel1 = texture2D(tex, vec2(fx, fy)).%c%c%c%c;\n"
" texel2 = texture2D(tex, vec2(fx + dx, fy)).%c%c%c%c;\n"
" y = dot(texel1.rgb, coeff1);\n"
" u1 = dot(texel1.rgb, coeff2);\n"
" u2 = dot(texel2.rgb, coeff2);\n"
" v1 = dot(texel1.rgb, coeff3);\n"
" v2 = dot(texel2.rgb, coeff3);\n"
" y += offset.x;\n"
" u1 += offset.y;\n"
" u2 += offset.y;\n"
" v1 += offset.z;\n"
" v2 += offset.z;\n"
" u = (u1 + u2) / 2.0;\n"
" v = (v1 + v2) / 2.0;\n"
" texel3.r = y;\n"
" if (inorder < 1.0) {\n"
" texel3.r = %s;\n"
" texel3.g = %s;\n"
" } else {\n"
" texel3.r = %s;\n"
" texel3.g = %s;\n"
" }\n"
" gl_FragColor = vec4(texel3.r, texel3.g, 0.0, 0.0);\n"
@ -831,14 +838,14 @@ _RGB_to_YUV (GstGLColorConvert * convert)
info->frag_prog = g_strdup_printf (frag_RGB_to_YUY2_UYVY,
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
"y1", "u", "y2", "v");
"u", "v");
info->out_n_textures = 1;
break;
case GST_VIDEO_FORMAT_UYVY:
info->frag_prog = g_strdup_printf (frag_RGB_to_YUY2_UYVY,
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
pixel_order[0], pixel_order[1], pixel_order[2], pixel_order[3],
"u", "y1", "v", "y2");
"u", "v");
info->out_n_textures = 1;
break;
default: