wlroots/render/gles2/shaders/tex_rgba.frag

#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif

varying vec2 v_texcoord;
uniform sampler2D tex;
uniform float alpha;

void main() {
	gl_FragColor = texture2D(tex, v_texcoord) * alpha;
}
render/gles2: default to highp if available The spec [1] says that the maximum value for a mediump float is at least 2¹⁴ in section 4.5.2. However, when using a 4k resolution texture coordinates will exceed this value. This causes issues on drivers which implement mediump as a 16-bit [2]. Switch to highp. There's a twist: on GLES2, support for highp is optional. So we need to guard it with cute GL_FRAGMENT_PRECISION_HIGH ifdefs. [1]: https://registry.khronos.org/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf [2]: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21082 2023-02-02 21:43:31 +00:00			`#ifdef GL_FRAGMENT_PRECISION_HIGH`
			`precision highp float;`
			`#else`
render/gles2: move shaders to individual files Instead of having a C file with strings for each shader, move each shader into its own file. Use a small POSIX shell script to convert the files into C strings (can't wait for C23 #embed...). The benefits from this are: - Improved readability and syntax highlighting. - Line numbers in shader compiler errors are easier to make sense of. - Consistency with the Vulkan renderer. - Shaders will become more complicated as we add color management features. 2022-10-26 10:03:50 +00:00			`precision mediump float;`
render/gles2: default to highp if available The spec [1] says that the maximum value for a mediump float is at least 2¹⁴ in section 4.5.2. However, when using a 4k resolution texture coordinates will exceed this value. This causes issues on drivers which implement mediump as a 16-bit [2]. Switch to highp. There's a twist: on GLES2, support for highp is optional. So we need to guard it with cute GL_FRAGMENT_PRECISION_HIGH ifdefs. [1]: https://registry.khronos.org/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf [2]: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21082 2023-02-02 21:43:31 +00:00			`#endif`

render/gles2: move shaders to individual files Instead of having a C file with strings for each shader, move each shader into its own file. Use a small POSIX shell script to convert the files into C strings (can't wait for C23 #embed...). The benefits from this are: - Improved readability and syntax highlighting. - Line numbers in shader compiler errors are easier to make sense of. - Consistency with the Vulkan renderer. - Shaders will become more complicated as we add color management features. 2022-10-26 10:03:50 +00:00			`varying vec2 v_texcoord;`
			`uniform sampler2D tex;`
			`uniform float alpha;`

			`void main() {`
			`gl_FragColor = texture2D(tex, v_texcoord) * alpha;`
			`}`