gtk/gdk/resources/glsl/gles2-texture.fs.glsl

precision mediump float;

uniform sampler2D map;
uniform int flipColors;

varying highp vec2 vUv;

void main() {
  vec4 color = texture2D(map, vUv);

  /* Flip R and B around to match the Cairo convention, if required */
  if (flipColors == 1)
    gl_FragColor = vec4(color.z, color.y, color.x, color.w);
  else
    gl_FragColor = color;
}
gdk: Add GLES shaders We cannot use GL shaders with GLES. 2016-04-22 12:52:49 +00:00			`precision mediump float;`

			`uniform sampler2D map;`
gl: Use a uniform to flip R and B colors on GLES This allows us to decide when the R and B color channels should be flipped with a much better granularity. For instance, when using GLX_EXT_texture_from_pixmap to create a GL texture from a surface we don't need to swap the R and B channels, as the internal representation of the texture data will already have the appropriate colors. We also don't need to flip color channels when blitting from a texture. 2016-04-25 12:38:22 +00:00			`uniform int flipColors;`
gdk: Add GLES shaders We cannot use GL shaders with GLES. 2016-04-22 12:52:49 +00:00
			`varying highp vec2 vUv;`

			`void main() {`
gl: Tweak the swizzle for GLES texture fragments Cairo surfaces are in BGRA format, but we upload them as RGBA buffers on GLES; this means that the R and B channels are flipped in the texture data. Instead of doing a costly channel flip before putting them on the GPU, we can flip the values inside the GLSL shader we use specifically for GLES. 2016-04-23 12:52:03 +00:00			`vec4 color = texture2D(map, vUv);`

gl: Use a uniform to flip R and B colors on GLES This allows us to decide when the R and B color channels should be flipped with a much better granularity. For instance, when using GLX_EXT_texture_from_pixmap to create a GL texture from a surface we don't need to swap the R and B channels, as the internal representation of the texture data will already have the appropriate colors. We also don't need to flip color channels when blitting from a texture. 2016-04-25 12:38:22 +00:00			`/* Flip R and B around to match the Cairo convention, if required */`
			`if (flipColors == 1)`
			`gl_FragColor = vec4(color.z, color.y, color.x, color.w);`
			`else`
			`gl_FragColor = color;`
gdk: Add GLES shaders We cannot use GL shaders with GLES. 2016-04-22 12:52:49 +00:00			`}`