Differential D6850 Diff 21804 intern/opencolorio/gpu_shader_display_transform.glsl

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intern/opencolorio/gpu_shader_display_transform.glsl

Show First 20 Lines • Show All 109 Lines • ▼ Show 20 Lines	vec4 curvemapping_evaluate_premulRGBF(vec4 col)
vec4 result;		vec4 result;
result.r = curvemap_evaluateF(0, col.r);		result.r = curvemap_evaluateF(0, col.r);
result.g = curvemap_evaluateF(1, col.g);		result.g = curvemap_evaluateF(1, col.g);
result.b = curvemap_evaluateF(2, col.b);		result.b = curvemap_evaluateF(2, col.b);
result.a = col.a;		result.a = col.a;
return result;		return result;
}		}

		/* Using a triangle distribution which gives a more final uniform noise.
		* See Banding in Games:A Noisy Rant(revision 5) Mikkel Gjøl, Playdead (slide 27) */
		/* GPUs are rounding before writting to framebuffer so we center the distribution around 0.0. */
		/* Return triangle noise in [-1..1[ range */
float dither_random_value(vec2 co)		float dither_random_value(vec2 co)
{		{
return fract(sin(dot(co.xy, vec2(12.9898, 78.233))) * 43758.5453) * 0.005 * dither;		/* Original code from https://www.shadertoy.com/view/4t2SDh */
		/* Uniform noise in [0..1[ range */
		float nrnd0 = fract(sin(dot(co.xy, vec2(12.9898, 78.233))) * 43758.5453);
		/* Convert uniform distribution into triangle-shaped distribution. */
		float orig = nrnd0 * 2.0 - 1.0;
		nrnd0 = orig * inversesqrt(abs(orig));
		nrnd0 = max(-1.0, nrnd0); /* Removes nan's */
		return nrnd0 - sign(orig);
}		}

vec2 round_to_pixel(sampler2D tex, vec2 uv)		vec2 round_to_pixel(sampler2D tex, vec2 uv)
{		{
vec2 size = textureSize(tex, 0);		vec2 size = textureSize(tex, 0);
return vec2(ivec2(uv * size)) / size;		return vec2(ivec2(uv * size)) / size;
}		}

vec4 apply_dither(vec4 col, vec2 uv)		vec4 apply_dither(vec4 col, vec2 uv)
{		{
col.rgb += dither_random_value(uv);		col.rgb += dither_random_value(uv) * 0.0033 * dither;
return col;		return col;
}		}

vec4 OCIO_ProcessColor(vec4 col, vec4 col_overlay, vec2 noise_uv)		vec4 OCIO_ProcessColor(vec4 col, vec4 col_overlay, vec2 noise_uv)
{		{
if (curve_mapping) {		if (curve_mapping) {
col = curvemapping_evaluate_premulRGBF(col);		col = curvemapping_evaluate_premulRGBF(col);
}		}

if (predivide) {		if (predivide) {
if (col.a > 0.0 && col.a < 1.0) {		if (col.a > 0.0 && col.a < 1.0) {
col.rgb *= 1.0 / col.a;		col.rgb *= 1.0 / col.a;
}		}
}		}

/* NOTE: This is true we only do de-premul here and NO premul		/* NOTE: This is true we only do de-premul here and NO premul
* and the reason is simple -- opengl is always configured		* and the reason is simple -- opengl is always configured
* for straight alpha at this moment		* for straight alpha at this moment
*/		*/

col = OCIO_to_display_linear_with_look(col, lut3d_texture);		col = OCIO_to_display_linear_with_look(col, lut3d_texture);

if (dither > 0.0) {
col = apply_dither(col, noise_uv);
}

if (overlay) {		if (overlay) {
col *= 1.0 - col_overlay.a;		col *= 1.0 - col_overlay.a;
col += col_overlay; /* Assumed unassociated alpha. */		col += col_overlay; /* Assumed unassociated alpha. */
}		}

col = OCIO_to_display_encoded(col, lut3d_display_texture);		col = OCIO_to_display_encoded(col, lut3d_display_texture);

		if (dither > 0.0) {
		col = apply_dither(col, noise_uv);
		}

return col;		return col;
}		}

/* ------------------------------------------------------------------------ */		/* ------------------------------------------------------------------------ */

in vec2 texCoord_interp;		in vec2 texCoord_interp;
out vec4 fragColor;		out vec4 fragColor;

void main()		void main()
{		{
vec4 col = texture(image_texture, texCoord_interp.st);		vec4 col = texture(image_texture, texCoord_interp.st);
vec4 col_overlay = texture(overlay_texture, texCoord_interp.st);		vec4 col_overlay = texture(overlay_texture, texCoord_interp.st);
vec2 noise_uv = round_to_pixel(image_texture, texCoord_interp.st);		vec2 noise_uv = round_to_pixel(image_texture, texCoord_interp.st);

fragColor = OCIO_ProcessColor(col, col_overlay, noise_uv);		fragColor = OCIO_ProcessColor(col, col_overlay, noise_uv);
}		}
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