Change precision mediump to highp for rendering issue.

some device can't support mediump, so it makes rendering issue.
To avoid it, we change precision mediump to highp

Change-Id: Ie3b0856b69828dcd4eba4871b6189935928d76a2

diff --git a/src/cairo-gl-shaders.c b/src/cairo-gl-shaders.c
index b5796f7..f50d648 100644 (file)
--- a/src/cairo-gl-shaders.c
+++ b/src/cairo-gl-shaders.c
@@ -220,7 +220,7 @@ _cairo_gl_context_init_shaders (cairo_gl_context_t *ctx)
 {
     static const char *fill_fs_source =
        "#ifdef GL_ES\n"
-       "precision mediump float;\n"
+       "precision highp float;\n"
        "#endif\n"
        "uniform vec4 color;\n"
        "void main()\n"
@@ -231,7 +231,7 @@ _cairo_gl_context_init_shaders (cairo_gl_context_t *ctx)
     static const char *glsl330_fill_fs_source =
        "#version 330\n"
        "#ifdef GL_ES\n"
-       "precision mediump float;\n"
+       "precision highp float;\n"
        "#endif\n"
        "uniform vec4 color;\n"
        "out vec4 fsColorOut;\n"
@@ -505,7 +505,7 @@ cairo_gl_shader_get_vertex_source (cairo_gl_var_type_t src,
     if (needs_glsl330 == CAIRO_GLSL_VERSION_330)
        _cairo_output_stream_printf (stream, "#version 330\n");
 
-    _cairo_output_stream_printf (stream, "#ifdef GL_ES\nprecision mediump float;\n#endif\n");
+    _cairo_output_stream_printf (stream, "#ifdef GL_ES\nprecision highp float;\n#endif\n");
 
     cairo_gl_shader_emit_variable (stream, src, CAIRO_GL_TEX_SOURCE, src_use_atlas);
     cairo_gl_shader_emit_variable (stream, mask, CAIRO_GL_TEX_MASK, mask_use_atlas);
@@ -1574,7 +1574,7 @@ cairo_gl_shader_get_fragment_source (cairo_gl_context_t *ctx,
 
     _cairo_output_stream_printf (stream,
        "#ifdef GL_ES\n"
-       "precision mediump float;\n"
+       "precision highp float;\n"
        "#endif\n");
 
     _cairo_gl_shader_emit_wrap (ctx, stream, src, CAIRO_GL_TEX_SOURCE);