gl-renderer: rename color uniform to unicolor

A more unique name is easier to grep for. Using 'color' as a local
variable might be useful in the future.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/renderer-gl/fragment.glsl

@@ -78,7 +78,7 @@ varying vec2 v_texcoord;
 uniform sampler2D tex1;
 uniform sampler2D tex2;
 uniform float alpha;
-uniform vec4 color;
+uniform vec4 unicolor;
 
 void
 main()
@@ -118,7 +118,7 @@ main()
 		gl_FragColor = yuva2rgba(y, u, v, alpha);
 
 	} else if (c_variant == SHADER_VARIANT_SOLID) {
-		gl_FragColor = alpha * color;
+		gl_FragColor = alpha * unicolor;
 
 	} else {
 		/* Never reached, bad variant value. */

libweston/renderer-gl/gl-shaders.c

@@ -235,7 +235,8 @@ gl_shader_create(struct gl_renderer *gr,
 	shader->tex_uniforms[1] = glGetUniformLocation(shader->program, "tex1");
 	shader->tex_uniforms[2] = glGetUniformLocation(shader->program, "tex2");
 	shader->alpha_uniform = glGetUniformLocation(shader->program, "alpha");
-	shader->color_uniform = glGetUniformLocation(shader->program, "color");
+	shader->color_uniform = glGetUniformLocation(shader->program,
+						     "unicolor");
 
 	free(conf);