38 lines
1.1 KiB
GLSL
38 lines
1.1 KiB
GLSL
// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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// https://code.qt.io/cgit/qt/qtbase.git/tree/examples/opengl/cube/vshader.glsl
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// Dylan Schooner - 2025
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// Modification: Implemented final Z-NDC re-inversion to compensate
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// for rigid OpenGL 2.0 context forcing glClearDepth(1.0).
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// This flips the high-precision Reverse Z output to the standard [0, W] range.
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#ifdef GL_ES
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// Set default precision to medium
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precision mediump int;
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precision mediump float;
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#endif
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uniform mat4 mvp_matrix;
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uniform mat4 model_matrix;
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attribute vec4 a_position;
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attribute vec2 a_texcoord;
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varying vec2 v_texcoord;
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void main()
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{
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// Calculate vertex position in screen space
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gl_Position = mvp_matrix * model_matrix * a_position;
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// Invert the z component of our Reverse Z matrix back to standard NDC
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float near_z = gl_Position.z;
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float w_c = gl_Position.w;
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gl_Position.z = w_c - near_z;
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// Pass texture coordinate to fragment shader
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// Value will be automatically interpolated to fragments inside polygon faces
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v_texcoord = a_texcoord;
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}
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