commit 69367082dedb45c95336e19636f460334ec0dc15
author Scott Moreau <oreaus@gmail.com> Tue Apr 17 19:06:19 2012 -0600
committer Kristian Høgsberg <krh@bitplanet.net> Thu Apr 19 12:50:57 2012 -0400
tree 1911a4a6cba0c419816e0db15a5cabc0671ee397
parent ff1db4a4f36be3b97f83cacc448b35a1615fe6c0

Install brightness and saturation variables for surface shader

src/compositor.c

diff --git a/src/compositor.c b/src/compositor.c
index 4c59da6..abf5ce9 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -226,6 +226,8 @@
 	surface->compositor = compositor;
 	surface->image = EGL_NO_IMAGE_KHR;
 	surface->alpha = 255;
+	surface->brightness = 255;
+	surface->saturation = 255;
 	surface->pitch = 1;
 
 	surface->buffer = NULL;
@@ -822,6 +824,8 @@
 	glUniform1i(es->shader->tex_uniform, 0);
 	glUniform4fv(es->shader->color_uniform, 1, es->color);
 	glUniform1f(es->shader->alpha_uniform, es->alpha / 255.0);
+	glUniform1f(es->shader->brightness_uniform, es->brightness / 255.0);
+	glUniform1f(es->shader->saturation_uniform, es->saturation / 255.0);
 	glUniform1f(es->shader->texwidth_uniform,
 		    (GLfloat)es->geometry.width / es->pitch);
 
@@ -2185,6 +2189,8 @@
 	"varying vec2 v_texcoord;\n"
 	"uniform sampler2D tex;\n"
 	"uniform float alpha;\n"
+	"uniform float bright;\n"
+	"uniform float saturation;\n"
 	"uniform float texwidth;\n"
 	"void main()\n"
 	"{\n"
@@ -2192,6 +2198,10 @@
 	"       v_texcoord.y < 0.0 || v_texcoord.y > 1.0)\n"
 	"      discard;\n"
 	"   gl_FragColor = texture2D(tex, v_texcoord)\n;"
+	"   float gray = dot(gl_FragColor.rgb, vec3(0.299, 0.587, 0.114));\n"
+	"   vec3 range = (gl_FragColor.rgb - vec3 (gray, gray, gray)) * saturation;\n"
+	"   gl_FragColor = vec4(vec3(gray + range), gl_FragColor.a);\n"
+	"   gl_FragColor = vec4(vec3(bright, bright, bright) * gl_FragColor.rgb, gl_FragColor.a);\n"
 	"   gl_FragColor = alpha * gl_FragColor;\n"
 	"}\n";
 
@@ -2253,6 +2263,8 @@
 	shader->proj_uniform = glGetUniformLocation(shader->program, "proj");
 	shader->tex_uniform = glGetUniformLocation(shader->program, "tex");
 	shader->alpha_uniform = glGetUniformLocation(shader->program, "alpha");
+	shader->brightness_uniform = glGetUniformLocation(shader->program, "bright");
+	shader->saturation_uniform = glGetUniformLocation(shader->program, "saturation");
 	shader->color_uniform = glGetUniformLocation(shader->program, "color");
 	shader->texwidth_uniform = glGetUniformLocation(shader->program,
 							"texwidth");