wlroots/render/gles2/shaders/quad.frag

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

varying vec2 v_texcoord;
uniform vec4 color;
uniform mat4 color_matrix;

void main() {
	gl_FragColor = color_matrix * color;
}
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 22:43:31 +01:00			`#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 12:03:50 +02:00			`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 22:43:31 +01:00			`#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 12:03:50 +02:00			`varying vec2 v_texcoord;`
render/gles2: move color uniform from quad.vert to quad.frag We have no use for a v_color varying. We can use the uniform directly from the fragment shader without getting the vertex shader involved. 2022-10-27 15:58:34 +02:00			`uniform vec4 color;`
render: gles2: Add colour conversion matrix to shaders This allows mapping to YCbCr without modifying the shader itself. Signed-off-by: Andri Yngvason <andri@yngvason.is> 2026-04-16 13:30:21 +00:00			`uniform mat4 color_matrix;`
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 12:03:50 +02:00
			`void main() {`
render: gles2: Add colour conversion matrix to shaders This allows mapping to YCbCr without modifying the shader itself. Signed-off-by: Andri Yngvason <andri@yngvason.is> 2026-04-16 13:30:21 +00:00			`gl_FragColor = color_matrix * color;`
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 12:03:50 +02:00			`}`