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Use builtin clamp() rather than min() + max()
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@ -93,7 +93,7 @@ vec4 vec4_premul(vec4 rgba) {
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* 7) Draw the images that are supposed to be above text again in the graphics shader
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*
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* 2b) Transparent bg with images
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* First everything is rendered into a framebuffer, and then the framebauffer is blended onto
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* First everything is rendered into a framebuffer, and then the framebuffer is blended onto
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* the screen. The framebuffer is needed because it allows access to the background color pixels
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* to blend with the image pixels. The steps are basically the same as for 2a.
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*
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@ -116,17 +116,17 @@ float srgb2linear(float x) {
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return pow(x, 2.2);
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}
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float clamp(float x) {
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float clamp_to_unit_float(float x) {
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// Clamp value to suitable output range
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return max(min(x, 1.0f), 0.0f);
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return clamp(x, 0.0f, 1.0f);
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}
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vec4 foreground_contrast(vec4 over, vec3 under) {
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float underL = dot(under, Y);
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float overL = dot(over.rgb, Y);
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// Apply additional gamma-adjustment scaled by the luminance difference, the darker the foreground the more adjustment we apply.
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// A multiplicative contrast is also available to increase sasturation.
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over.a = clamp(mix(over.a, pow(over.a, text_gamma_adjustment), (1 - overL + underL) * text_gamma_scaling) * text_contrast);
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// A multiplicative contrast is also available to increase saturation.
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over.a = clamp_to_unit_float(mix(over.a, pow(over.a, text_gamma_adjustment), (1 - overL + underL) * text_gamma_scaling) * text_contrast);
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return over;
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}
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@ -138,7 +138,7 @@ vec4 foreground_contrast_incorrect(vec4 over, vec3 under) {
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//
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// linear2srgb(over * overA2 + under * (1 - overA2)) = linear2srgb(over) * over.a + linear2srgb(under) * (1 - over.a)
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// ^ gamma correct blending with new alpha ^ gamma incorrect blending with old alpha
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over.a = clamp((srgb2linear(linear2srgb(overL) * over.a + linear2srgb(underL) * (1.0f - over.a)) - underL) / (overL - underL));
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over.a = clamp_to_unit_float((srgb2linear(linear2srgb(overL) * over.a + linear2srgb(underL) * (1.0f - over.a)) - underL) / (overL - underL));
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return over;
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}
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