Testing mod workaround

fuzzie360 · fuzzie360 · commit c90801335ed4 · 2016-03-01T18:07:57.000+08:00
diff --git a/src/backend/mode_gpu.js b/src/backend/mode_gpu.js
@@ -289,6 +289,12 @@
 					opt.hardcodeConstants ? 'vec2 uTexSize = vec2('+texSize[0]+','+texSize[1]+');' : 'uniform vec2 uTexSize;',
 					'varying vec2 vTexCoord;',
 					'',
+					'float actuallyMod(float x, float y) {',
+					'	float f = mod(x, y);',
+					'	if (abs(f-y) < 0.001) return 0.0;',
+					'	return f;',
+					'}',
+					'',
 					opt.offsetRangeHack ? '#define OFFSET_HACK' : '',
 					'#ifndef OFFSET_HACK',
 					'/* Begin: http://stackoverflow.com/questions/7059962/how-do-i-convert-a-vec4-rgba-value-to-a-float */',
@@ -301,9 +307,9 @@
 					'	exponent = floor(log2(F) + 127.0) + floor(log2(mantissa));',
 					'	highp vec4 rgba;',
 					'	rgba.a = 128.0 * sign + floor(exponent*exp2(-1.0));',
-					'	rgba.b = 128.0 * mod(exponent,2.0) + mod(floor(mantissa*128.0),128.0);',
-					'	rgba.g = floor(mod(floor(mantissa*exp2(23.0 -8.0)),exp2(8.0)));',
-					'	rgba.r = floor(exp2(23.0)*mod(mantissa,exp2(-15.0)));',
+					'	rgba.b = 128.0 * actuallyMod(exponent,2.0) + actuallyMod(floor(mantissa*128.0),128.0);',
+					'	rgba.g = floor(actuallyMod(floor(mantissa*exp2(23.0 -8.0)),exp2(8.0)));',
+					'	rgba.r = floor(exp2(23.0)*actuallyMod(mantissa,exp2(-15.0)));',
 					(endianness == 'LE' ? '' : '	rgba.rgba = rgba.abgr;'),
 					'	return rgba / 255.0;',
 					'}',
@@ -312,8 +318,8 @@
 					(endianness == 'LE' ? '' : '	rgba.rgba = rgba.abgr;'),
 					'	rgba *= 255.0;',
 					'	highp float sign = 1.0 - step(128.0,rgba.a)*2.0;',
-					'	highp float exponent = 2.0 * mod(rgba.a,128.0) + step(128.0,rgba.b) - 127.0; ',
-					'	highp float mantissa = mod(rgba.b,128.0)*65536.0 + rgba.g*256.0 +rgba.r + float(0x800000);',
+					'	highp float exponent = 2.0 * actuallyMod(rgba.a,128.0) + step(128.0,rgba.b) - 127.0; ',
+					'	highp float mantissa = actuallyMod(rgba.b,128.0)*65536.0 + rgba.g*256.0 +rgba.r + float(0x800000);',
 					'	highp float result =  sign * exp2(exponent) * (mantissa * exp2(-23.0 )); ',
 					'	return result;',
 					'}',
@@ -354,7 +360,7 @@
 					'	float z = floor(idx / (texDim.x * texDim.y));',
 					'	idx -= z * texDim.x * texDim.y;',
 					'	float y = floor(idx / texDim.x);',
-					'	float x = mod(idx, texDim.x);',
+					'	float x = actuallyMod(idx, texDim.x);',
 					'	return vec3(x, y, z);',
 					'}',
 					'',
@@ -363,10 +369,8 @@
 					(opt.wraparound ? '	xyz = mod(xyz, texDim);' : ''),
 					'	float index = (xyz.z * texDim.x * texDim.y) + (xyz.y * texDim.x) + xyz.x;',
 					'	float t = floor(index / texSize.x);',
-					'	float s = mod(index, texSize.x);',
+					'	float s = actuallyMod(index, texSize.x);',
 					(opt.safeTextureReadHack ? 's += 1.0; t += 1.0;' : ''),
-					'	s = (s < 0.5) ? 0.0 : s + 0.5;',
-					'	t = (t < 0.5) ? 0.0 : t + 0.5;',
 					(opt.safeTextureReadHack ? 'return decode32(texture2D(tex, vec2(s / (texSize.x + 2.0), t / (texSize.y + 2.0))));' : ''),
 					'	return decode32(texture2D(tex, vec2(s / texSize.x, t / texSize.y)));',
 					'}',
