C++ (Cpp) cairo_gl_shader_emit_colorの例

コード例 #1

ファイル: cairo-gl-shaders.c プロジェクト: 499940913/moon

static cairo_status_t
cairo_gl_shader_get_fragment_source (GLuint tex_target,
                                     cairo_gl_shader_in_t in,
                                     cairo_gl_operand_type_t src,
                                     cairo_gl_operand_type_t mask,
                                     cairo_gl_operand_type_t dest,
				     char **out)
{
    cairo_output_stream_t *stream = _cairo_memory_stream_create ();
    unsigned char *source;
    unsigned int length;
    cairo_status_t status;

    cairo_gl_shader_emit_color (stream, tex_target, src, CAIRO_GL_TEX_SOURCE);
    cairo_gl_shader_emit_color (stream, tex_target, mask, CAIRO_GL_TEX_MASK);

    _cairo_output_stream_printf (stream,
        "void main()\n"
        "{\n");
    switch (in) {
    case CAIRO_GL_SHADER_IN_COUNT:
    default:
        ASSERT_NOT_REACHED;
    case CAIRO_GL_SHADER_IN_NORMAL:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source() * get_mask().a;\n");
        break;
    case CAIRO_GL_SHADER_IN_CA_SOURCE:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source() * get_mask();\n");
        break;
    case CAIRO_GL_SHADER_IN_CA_SOURCE_ALPHA:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source().a * get_mask();\n");
        break;
    }

    _cairo_output_stream_write (stream,
                                "}\n\0", 3);

    status = _cairo_memory_stream_destroy (stream, &source, &length);
    if (unlikely (status))
        return status;

    *out = (char *) source;
    return CAIRO_STATUS_SUCCESS;
}

コード例 #2

ファイル: cairo-gl-shaders.c プロジェクト: CODECOMMUNITY/cairo

static cairo_status_t
cairo_gl_shader_get_fragment_source (cairo_gl_context_t *ctx,
                                     cairo_gl_shader_in_t in,
                                     cairo_gl_operand_t *src,
                                     cairo_gl_operand_t *mask,
				     cairo_bool_t use_coverage,
                                     cairo_gl_operand_type_t dest_type,
				     char **out)
{
    cairo_output_stream_t *stream = _cairo_memory_stream_create ();
    unsigned char *source;
    unsigned long length;
    cairo_status_t status;
    const char *coverage_str;

    _cairo_output_stream_printf (stream,
	"#ifdef GL_ES\n"
	"precision mediump float;\n"
	"#endif\n");

    _cairo_gl_shader_emit_wrap (ctx, stream, src, CAIRO_GL_TEX_SOURCE);
    _cairo_gl_shader_emit_wrap (ctx, stream, mask, CAIRO_GL_TEX_MASK);

    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);
	if (_cairo_gl_shader_needs_border_fade (mask))
	    _cairo_gl_shader_emit_border_fade (stream, mask, CAIRO_GL_TEX_MASK);
    }

    cairo_gl_shader_emit_color (stream, ctx, src, CAIRO_GL_TEX_SOURCE);
    cairo_gl_shader_emit_color (stream, ctx, mask, CAIRO_GL_TEX_MASK);

    coverage_str = "";
    if (use_coverage) {
	_cairo_output_stream_printf (stream, "varying float coverage;\n");
	coverage_str = " * coverage";
    }

    _cairo_output_stream_printf (stream,
        "void main()\n"
        "{\n");
    switch (in) {
    case CAIRO_GL_SHADER_IN_COUNT:
    default:
        ASSERT_NOT_REACHED;
    case CAIRO_GL_SHADER_IN_NORMAL:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source() * get_mask().a%s;\n",
	    coverage_str);
        break;
    case CAIRO_GL_SHADER_IN_CA_SOURCE:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source() * get_mask()%s;\n",
	    coverage_str);
        break;
    case CAIRO_GL_SHADER_IN_CA_SOURCE_ALPHA:
        _cairo_output_stream_printf (stream,
            "    gl_FragColor = get_source().a * get_mask()%s;\n",
	    coverage_str);
        break;
    }

    _cairo_output_stream_write (stream,
                                "}\n\0", 3);

    status = _cairo_memory_stream_destroy (stream, &source, &length);
    if (unlikely (status))
        return status;

    *out = (char *) source;
    return CAIRO_STATUS_SUCCESS;
}