diff --git a/includes/graphics.h b/includes/graphics.h
index b9d39bb2d..f86158a59 100644
--- a/includes/graphics.h
+++ b/includes/graphics.h
@@ -224,21 +224,24 @@ void ogl_blit(int x, int y, int w, int h, pixel *src, int pitch, int scale);
 #ifdef INCLUDE_SHADERS
 #ifndef SHADERS_H
 #define SHADERS_H
-const char * fireFragment = "uniform sampler2D fireAlpha;\
+const char * fireFragment = "#version 120\n\
+uniform sampler2D fireAlpha;\
 void main () {\
     vec4 texColor = texture2D(fireAlpha, gl_PointCoord);\
     gl_FragColor = vec4(gl_Color.rgb, texColor.a*gl_Color.a);\
 }";
-const char * fireVertex = "void main(void)\
+const char * fireVertex = "#version 120\n\
+void main(void)\
 {\
    gl_Position = ftransform();;\
    gl_FrontColor = gl_Color;\
 }";
-const char * lensFragment = "uniform sampler2D pTex;\
+const char * lensFragment = "#version 120\n\
+uniform sampler2D pTex;\
 uniform sampler2D tfX;\
 uniform sampler2D tfY;\
-uniform float xres = 612.0;\
-uniform float yres = 384.0;\
+uniform float xres;\
+uniform float yres;\
 void main () {\
 	vec4 transformX = texture2D(tfX, vec2(gl_TexCoord[0].s, -gl_TexCoord[0].t));\
 	vec4 transformY = -texture2D(tfY, vec2(gl_TexCoord[0].s, -gl_TexCoord[0].t));\
@@ -252,13 +255,15 @@ void main () {\
     );\
     gl_FragColor = texColor;\
 }";
-const char * lensVertex = "void main(void)\
+const char * lensVertex = "#version 120\n\
+void main(void)\
 {\
 	gl_TexCoord[0]  = gl_MultiTexCoord0;\
 	gl_Position = ftransform();;\
 	gl_FrontColor = gl_Color;\
 }";
-const char * airVFragment = "uniform sampler2D airX;\
+const char * airVFragment = "#version 120\n\
+uniform sampler2D airX;\
 uniform sampler2D airY;\
 uniform sampler2D airP;\
 void main () {\
@@ -267,26 +272,30 @@ void main () {\
 	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
 	gl_FragColor = vec4(abs(texX.r)/2.0, texP.b/2.0, abs(texY.g)/2.0, 1.0);\
 }";
-const char * airVVertex = "void main(void)\
+const char * airVVertex = "#version 120\n\
+void main(void)\
 {\
 	gl_TexCoord[0]  = gl_MultiTexCoord0;\
 	gl_Position = ftransform();;\
 	gl_FrontColor = gl_Color;\
 }";
-const char * airPFragment = "uniform sampler2D airX;\
+const char * airPFragment = "#version 120\n\
+uniform sampler2D airX;\
 uniform sampler2D airY;\
 uniform sampler2D airP;\
 void main () {\
 	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
     gl_FragColor = vec4(max(texP.b/2.0, 0), 0, abs(min(texP.b/2.0, 0)), 1.0);\
 }";
-const char * airPVertex = "void main(void)\
+const char * airPVertex = "#version 120\n\
+void main(void)\
 {\
 	gl_TexCoord[0]  = gl_MultiTexCoord0;\
 	gl_Position = ftransform();;\
 	gl_FrontColor = gl_Color;\
 }";
-const char * airCFragment = "uniform sampler2D airX;\
+const char * airCFragment = "#version 120\n\
+uniform sampler2D airX;\
 uniform sampler2D airY;\
 uniform sampler2D airP;\
 void main () {\
@@ -295,7 +304,8 @@ void main () {\
 	vec4 texP = texture2D(airP, gl_TexCoord[0].st);\
     gl_FragColor = vec4(max(texP.b/2.0, 0), 0, abs(min(texP.b/2.0, 0)), 1.0) + vec4(abs(texX.r)/8.0, abs(texX.r)/8.0, abs(texX.r)/8.0, 1.0) + vec4(abs(texY.g)/8.0, abs(texY.g)/8.0, abs(texY.g)/8.0, 1.0);\
 }";
-const char * airCVertex = "void main(void)\
+const char * airCVertex = "#version 120\n\
+void main(void)\
 {\
 	gl_TexCoord[0]  = gl_MultiTexCoord0;\
 	gl_Position = ftransform();;\
diff --git a/src/graphics.c b/src/graphics.c
index 8f5fe8c62..2409b98de 100644
--- a/src/graphics.c
+++ b/src/graphics.c
@@ -2515,6 +2515,7 @@ void render_parts(pixel *vid)
 		glEnable( GL_TEXTURE_2D );
 		if(cmode==CM_FANCY)
 		{
+			float xres = XRES, yres = YRES;
 			glUseProgram(lensProg);
 			glActiveTexture(GL_TEXTURE0);			
 			glBindTexture(GL_TEXTURE_2D, partsFboTex);
@@ -2528,8 +2529,8 @@ void render_parts(pixel *vid)
 			glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, XRES, YRES, GL_GREEN, GL_FLOAT, gravyf);
 			glUniform1i(glGetUniformLocation(lensProg, "tfY"), 2);
 			glActiveTexture(GL_TEXTURE0);
-			//glUniform1f(glGetUniformLocation(lensProg, "xres"), (float)XRES);
-			//glUniform1f(glGetUniformLocation(lensProg, "yres"), (float)YRES);
+			glUniform1fv(glGetUniformLocation(lensProg, "xres"), 1, &xres);
+			glUniform1fv(glGetUniformLocation(lensProg, "yres"), 1, &yres);
 		}
 		else
 		{