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gl: Define the float precision in the fragment shader for GLES2

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According to the GLSL ES standard, the precision of variables in the fragment
shader should be explicitly defined (although mesa's compiler is not that
strict).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Alexandros Frantzis 2011-03-09 18:17:42 +02:00 • committed by Chris Wilson
parent 1595f20bb7
commit 2001d20747
1 changed files with 8 additions and 0 deletions
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8
src/cairo-gl-shaders.c
View file

@ -385,6 +385,9 @@ cairo_status_t
_cairo_gl_context_init_shaders (cairo_gl_context_t *ctx)
{
static const char *fill_fs_source =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform vec4 color;\n"
"void main()\n"
"{\n"
@ -847,6 +850,11 @@ cairo_gl_shader_get_fragment_source (cairo_gl_context_t *ctx,
unsigned long length;
cairo_status_t status;
_cairo_output_stream_printf (stream,
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n");
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES) {
if (_cairo_gl_shader_needs_border_fade (src))
_cairo_gl_shader_emit_border_fade (stream, src, CAIRO_GL_TEX_SOURCE);