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Revert "take the absolute value of the z component when calculating w, else" 

This reverts commit 7d2e9cf3e6.
This commit is contained in:
Anthony Pesch 2017-11-16 17:57:45 -05:00
parent 3f1de03557
commit 7a2d89adfb
1 changed files with 4 additions and 9 deletions
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13
src/render/ta.glsl
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@ -22,12 +22,7 @@ static const char *ta_vp =
" // actual z coordinate provided to the ta, just 1/w. due to this, we set\n"
" // z = w in the vertex shader such that the clip test always passes, and\n"
" // then gl_FragDepth is manually set to w in the fragment shader\n"
" gl_Position.z = 1.0 / attr_xyz.z;\n"
" // take the absolute value of z for w. if w is negative the vertex will\n"
" // always fail the clip test which is defined as:\n"
" // -w <= x,y,z <= w\n"
" gl_Position.w = abs(gl_Position.z);\n"
" gl_Position.zw = 1.0f / attr_xyz.zz;\n"
" // cancel the perspective divide on the xy, they're already in ndc space\n"
" gl_Position.xy *= gl_Position.w;\n"
@ -54,9 +49,8 @@ static const char *ta_fp =
" tex.a = 1.0;\n"
" #endif\n"
" #ifdef ALPHA_TEST\n"
" if (tex.a < u_alpha_ref) {\n"
" if (tex.a < u_alpha_ref)\n"
" discard;\n"
" }\n"
" #endif\n"
" #ifdef SHADE_DECAL\n"
" fragcolor = tex;\n"
@ -81,7 +75,7 @@ static const char *ta_fp =
" #ifdef ALPHA_TEST\n"
" // punch through polys are always drawn with an alpha value of 1.0\n"
" fragcolor.a = 1.0;\n"
" fragcolor.a = 1.0f;\n"
" #endif\n"
" // gl_FragCoord.w is 1/clip.w aka the original 1/w passed to the TA,\n"
@ -101,6 +95,7 @@ static const char *ta_fp =
" // note, 2^17 was chosen as ~100000 was largest value i'd seen passed as\n"
" // the w component at the time this was written\n"
" highp float w = 1.0 / gl_FragCoord.w;\n"
" gl_FragDepth = log2(1.0 + w) / 17.0;\n"