diff --git a/wadsrc/static/shaders/glsl/burn.fp b/wadsrc/static/shaders/glsl/burn.fp
index 8ccb553f8..d14748212 100644
--- a/wadsrc/static/shaders/glsl/burn.fp
+++ b/wadsrc/static/shaders/glsl/burn.fp
@@ -1,12 +1,14 @@
 uniform sampler2D tex;
 uniform sampler2D texture2;
+in vec4 vTexCoord;
+in vec4 vColor;
 
 void main()
 {
-	vec4 frag = gl_Color;
+	vec4 frag = vColor;
 
-	vec4 t1 = texture2D(texture2, gl_TexCoord[0].xy);
-	vec4 t2 = texture2D(tex, vec2(gl_TexCoord[0].x, 1.0-gl_TexCoord[0].y));
+	vec4 t1 = texture2D(texture2, vTexCoord.xy);
+	vec4 t2 = texture2D(tex, vec2(vTexCoord.x, 1.0-vTexCoord.y));
 	
 	gl_FragColor = frag * vec4(t1.r, t1.g, t1.b, t2.a);
 }
diff --git a/wadsrc/static/shaders/glsl/func_brightmap.fp b/wadsrc/static/shaders/glsl/func_brightmap.fp
index b8b2a9f20..bea336eb6 100644
--- a/wadsrc/static/shaders/glsl/func_brightmap.fp
+++ b/wadsrc/static/shaders/glsl/func_brightmap.fp
@@ -2,11 +2,11 @@ uniform sampler2D texture2;
 
 vec4 ProcessTexel()
 {
-	return getTexel(gl_TexCoord[0].st);
+	return getTexel(vTexCoord.st);
 }
 
 vec4 ProcessLight(vec4 color)
 {
-	vec4 brightpix = desaturate(texture2D(texture2, gl_TexCoord[0].st));
+	vec4 brightpix = desaturate(texture2D(texture2, vTexCoord.st));
 	return vec4(min (color.rgb + brightpix.rgb, 1.0), color.a);
 }
diff --git a/wadsrc/static/shaders/glsl/func_normal.fp b/wadsrc/static/shaders/glsl/func_normal.fp
index d3b0d182c..184c14851 100644
--- a/wadsrc/static/shaders/glsl/func_normal.fp
+++ b/wadsrc/static/shaders/glsl/func_normal.fp
@@ -1,6 +1,6 @@
 
 vec4 ProcessTexel()
 {
-	return getTexel(gl_TexCoord[0].st);
+	return getTexel(vTexCoord.st);
 }
 
diff --git a/wadsrc/static/shaders/glsl/func_warp1.fp b/wadsrc/static/shaders/glsl/func_warp1.fp
index 2dbf8a420..891eaa936 100644
--- a/wadsrc/static/shaders/glsl/func_warp1.fp
+++ b/wadsrc/static/shaders/glsl/func_warp1.fp
@@ -2,7 +2,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 
 	const float pi = 3.14159265358979323846;
 	vec2 offset = vec2(0,0);
diff --git a/wadsrc/static/shaders/glsl/func_warp2.fp b/wadsrc/static/shaders/glsl/func_warp2.fp
index 78044f970..7cc5e7ebb 100644
--- a/wadsrc/static/shaders/glsl/func_warp2.fp
+++ b/wadsrc/static/shaders/glsl/func_warp2.fp
@@ -2,7 +2,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 
 	const float pi = 3.14159265358979323846;
 	vec2 offset = vec2(0.0,0.0);
diff --git a/wadsrc/static/shaders/glsl/func_wavex.fp b/wadsrc/static/shaders/glsl/func_wavex.fp
index 5172239c7..e4230ae87 100644
--- a/wadsrc/static/shaders/glsl/func_wavex.fp
+++ b/wadsrc/static/shaders/glsl/func_wavex.fp
@@ -2,7 +2,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 
 	const float pi = 3.14159265358979323846;
 
diff --git a/wadsrc/static/shaders/glsl/fuzz_jagged.fp b/wadsrc/static/shaders/glsl/fuzz_jagged.fp
index 103f34689..c088c7b30 100644
--- a/wadsrc/static/shaders/glsl/fuzz_jagged.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_jagged.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 
 	vec2 texSplat;
 	const float pi = 3.14159265358979323846;
diff --git a/wadsrc/static/shaders/glsl/fuzz_noise.fp b/wadsrc/static/shaders/glsl/fuzz_noise.fp
index 02985a122..9f5da5f25 100644
--- a/wadsrc/static/shaders/glsl/fuzz_noise.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_noise.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	texCoord.x = float( int(texCoord.x * 128.0) ) / 128.0;
diff --git a/wadsrc/static/shaders/glsl/fuzz_smooth.fp b/wadsrc/static/shaders/glsl/fuzz_smooth.fp
index 597debb53..4261d5415 100644
--- a/wadsrc/static/shaders/glsl/fuzz_smooth.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_smooth.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	float texX = texCoord.x / 3.0 + 0.66;
diff --git a/wadsrc/static/shaders/glsl/fuzz_smoothnoise.fp b/wadsrc/static/shaders/glsl/fuzz_smoothnoise.fp
index 196cca33a..bfe04ec16 100644
--- a/wadsrc/static/shaders/glsl/fuzz_smoothnoise.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_smoothnoise.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	float texX = sin(mod(texCoord.x * 100.0 + timer*5.0, 3.489)) + texCoord.x / 4.0;
diff --git a/wadsrc/static/shaders/glsl/fuzz_smoothtranslucent.fp b/wadsrc/static/shaders/glsl/fuzz_smoothtranslucent.fp
index bfd60de57..75bee0330 100644
--- a/wadsrc/static/shaders/glsl/fuzz_smoothtranslucent.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_smoothtranslucent.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	float texX = sin(texCoord.x * 100.0 + timer*5.0);
diff --git a/wadsrc/static/shaders/glsl/fuzz_standard.fp b/wadsrc/static/shaders/glsl/fuzz_standard.fp
index a1bd0ebaf..fd87eaa46 100644
--- a/wadsrc/static/shaders/glsl/fuzz_standard.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_standard.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	texCoord.x = float( int(texCoord.x * 128.0) ) / 128.0;
diff --git a/wadsrc/static/shaders/glsl/fuzz_swirly.fp b/wadsrc/static/shaders/glsl/fuzz_swirly.fp
index de91e47d6..86a66ac8e 100644
--- a/wadsrc/static/shaders/glsl/fuzz_swirly.fp
+++ b/wadsrc/static/shaders/glsl/fuzz_swirly.fp
@@ -3,7 +3,7 @@ uniform float timer;
 
 vec4 ProcessTexel()
 {
-	vec2 texCoord = gl_TexCoord[0].st;
+	vec2 texCoord = vTexCoord.st;
 	vec4 basicColor = getTexel(texCoord);
 
 	float texX = sin(texCoord.x * 100.0 + timer*5.0);
diff --git a/wadsrc/static/shaders/glsl/main.fp b/wadsrc/static/shaders/glsl/main.fp
index 30a815b3c..6bb96aa9a 100644
--- a/wadsrc/static/shaders/glsl/main.fp
+++ b/wadsrc/static/shaders/glsl/main.fp
@@ -1,6 +1,8 @@
 in vec4 pixelpos;
 in vec2 glowdist;
 
+in vec4 vTexCoord;
+in vec4 vColor;
 
 #ifdef SHADER_STORAGE_LIGHTS
 	layout(std430, binding = 3) buffer ParameterBuffer
@@ -120,7 +122,7 @@ float R_DoomLightingEquation(float light, float dist)
 
 vec4 getLightColor(float fogdist, float fogfactor)
 {
-	vec4 color = gl_Color;
+	vec4 color = vColor;
 	
 	if (uLightLevel >= 0.0)
 	{
@@ -193,7 +195,7 @@ vec4 getLightColor(float fogdist, float fogfactor)
 	color.rgb = clamp(color.rgb + desaturate(dynlight).rgb, 0.0, 1.4);
 	
 	// prevent any unintentional messing around with the alpha.
-	return vec4(color.rgb, gl_Color.a);
+	return vec4(color.rgb, vColor.a);
 }
 
 //===========================================================================
@@ -291,14 +293,14 @@ void main()
 		{
 			float gray = (frag.r * 0.3 + frag.g * 0.56 + frag.b * 0.14);	
 			vec4 cm = uFixedColormapStart + gray * uFixedColormapRange;
-			frag = vec4(clamp(cm.rgb, 0.0, 1.0), frag.a*gl_Color.a);
+			frag = vec4(clamp(cm.rgb, 0.0, 1.0), frag.a*vColor.a);
 			break;
 		}
 		
 		case 2:
 		{
 			frag = frag * uFixedColormapStart;
-			frag.a *= gl_Color.a;
+			frag.a *= vColor.a;
 			break;
 		}
 
@@ -320,7 +322,7 @@ void main()
 			}
 			fogfactor = exp2 (uFogDensity * fogdist);
 			
-			frag = vec4(uFogColor.rgb, (1.0 - fogfactor) * frag.a * 0.75 * gl_Color.a);
+			frag = vec4(uFogColor.rgb, (1.0 - fogfactor) * frag.a * 0.75 * vColor.a);
 			break;
 		}
 	}
diff --git a/wadsrc/static/shaders/glsl/main.vp b/wadsrc/static/shaders/glsl/main.vp
index 7a434ccbe..e1349857e 100644
--- a/wadsrc/static/shaders/glsl/main.vp
+++ b/wadsrc/static/shaders/glsl/main.vp
@@ -5,6 +5,9 @@ out vec4 pixelpos;
 out vec2 glowdist;
 #endif
 
+out vec4 vTexCoord;
+out vec4 vColor;
+
 #ifdef UNIFORM_VB
 uniform float fakeVB[100];
 #endif
@@ -40,7 +43,7 @@ void main()
 
 	vec4 eyeCoordPos = ViewMatrix * worldcoord;
 
-	gl_FrontColor = gl_Color;
+	vColor = gl_Color;
 
 	#ifndef SIMPLE
 		pixelpos.xyz = worldcoord.xyz;
@@ -56,9 +59,9 @@ void main()
 		vec3 r = reflect(u, n.xyz);
 		float m = 2.0 * sqrt( r.x*r.x + r.y*r.y + (r.z+1.0)*(r.z+1.0) );
 		vec2 sst = vec2(r.x/m + 0.5,  r.y/m + 0.5);
-		gl_TexCoord[0].xy = sst;
+		vTexCoord.xy = sst;
 	#else
-		gl_TexCoord[0] = TextureMatrix * tc;
+		vTexCoord = TextureMatrix * tc;
 	#endif
 	
 	gl_Position = ProjectionMatrix * eyeCoordPos;