Establish correct range of output.

Outputs/OpenGL/ScanTarget.cpp

@@ -677,7 +677,7 @@ void ScanTarget::update(const int output_width, const int output_height) {
 
 			if(is_composite(existing_modals_->display_type)) {
 				separation_buffer_.bind_framebuffer();
-				composition_shader_.bind();
+				separation_shader_.bind();
 				test_gl([&]{ glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(num_dirty_zones)); });
 			}
 
@@ -812,7 +812,7 @@ void ScanTarget::draw(int output_width, int output_height) {
 		// Copy the accumulation texture to the target.
 		test_gl([&]{ glBindFramebuffer(GL_FRAMEBUFFER, target_framebuffer_); });
 		test_gl([&]{ glViewport(0, 0, (GLsizei)output_width, (GLsizei)output_height); });
-		copy_shader_.perform(SeparationTextureUnit);	// CompositionTextureUnit
+		copy_shader_.perform(SeparationTextureUnit);	// 
 	}
 
 	is_drawing_to_accumulation_buffer_.clear(std::memory_order_release);

Outputs/OpenGL/Shaders/SeparationShader.cpp

@@ -66,9 +66,7 @@ void main(void) {
 	coordinates[30] = vec2(centreX + 15.0, sampleY) / bufferSize;
 
 	gl_Position = vec4(
-//		(vec2(centreX, sampleY) / bufferSize - vec2(0.5)) * vec2(2.0),
-		lateral,
-		longitudinal,
+		(vec2(centreX, sampleY) / bufferSize - vec2(0.5)) * vec2(2.0),
 		0.0,
 		1.0
 	);
@@ -122,7 +120,7 @@ void main(void) {
 		filterCoefficients[30] * texture(source, coordinates[30]).x;
 
 	outputColour = vec4(
-		1.0, 1.0, 0.0, 1.0);
+		coordinates[15], 0.0, 1.0);
 //		channels.x,
 //		channels.y * centre.yz,
 //		1.0
@@ -174,7 +172,7 @@ OpenGL::Shader OpenGL::separation_shader(
 	//
 	// Set uniforms.
 	//
-	shader.set_uniform("samplesPerLine", samples_per_line);
+	shader.set_uniform("samplesPerLine", float(samples_per_line));
 	shader.set_uniform("bufferSize", float(buffer_width), float(buffer_height));
 	shader.set_uniform("source", GLint(source_texture_unit - GL_TEXTURE0));