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LibGL: Implement "clamp" wrap mode

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This commit is contained in:
Stephan Unverwerth 2021-08-11 21:18:01 +02:00 committed by Andreas Kling
parent 12785849aa
commit 8902efa52d
Notes: sideshowbarker 2024-07-18 07:05:02 +09:00 
Author: https://github.com/sunverwerth
Commit: https://github.com/SerenityOS/serenity/commit/8902efa52d8
Pull-request: https://github.com/SerenityOS/serenity/pull/9350
2 changed files with 23 additions and 1 deletions
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5
Userland/Libraries/LibGL/GL/gl.h
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@ -199,7 +199,10 @@ extern "C" {
#define GL_NEAREST 0x2600
#define GL_LINEAR 0x2601
#define GL_NEAREST_MIPMAP_LINEAR 0x2602
#define GL_REPEAT 0x2603
#define GL_CLAMP 0x2900
#define GL_REPEAT 0x2901
#define GL_CLAMP_TO_BORDER 0x812D
#define GL_CLAMP_TO_EDGE 0x812F
// OpenGL State & GLGet
#define GL_MODELVIEW_MATRIX 0x0BA6

19
Userland/Libraries/LibGL/Tex/Sampler2D.cpp
View File

@ -16,6 +16,11 @@ static constexpr float wrap_repeat(float value)
return value - floorf(value);
}
static constexpr float wrap_clamp(float value)
{
return clamp(value, 0.0f, 1.0f);
}
FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
{
// FIXME: Calculate the correct mipmap level here, need to receive uv derivatives for that
@ -31,6 +36,13 @@ FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
x = wrap_repeat(x);
break;
// FIXME: These clamp modes actually have slightly different behaviour
case GL_CLAMP:
case GL_CLAMP_TO_BORDER:
case GL_CLAMP_TO_EDGE:
x = wrap_clamp(x);
break;
default:
VERIFY_NOT_REACHED();
}
@ -40,6 +52,13 @@ FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
y = wrap_repeat(y);
break;
// FIXME: These clamp modes actually have slightly different behaviour
case GL_CLAMP:
case GL_CLAMP_TO_BORDER:
case GL_CLAMP_TO_EDGE:
y = wrap_clamp(y);
break;
default:
VERIFY_NOT_REACHED();
}