24 lines
996 B
GLSL
24 lines
996 B
GLSL
// Copyright 2023 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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//? #version 430 core
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layout(location = 0) in vec2 vert_position;
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layout(location = 1) in vec2 vert_tex_coord;
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layout(location = 0) out vec2 frag_tex_coord;
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// This is a truncated 3x3 matrix for 2D transformations:
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// The upper-left 2x2 submatrix performs scaling/rotation/mirroring.
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// The third column performs translation.
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// The third row could be used for projection, which we don't need in 2D. It hence is assumed to
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// implicitly be [0, 0, 1]
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uniform mat3x2 modelview_matrix;
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void main() {
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// Multiply input position by the rotscale part of the matrix and then manually translate by
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// the last column. This is equivalent to using a full 3x3 matrix and expanding the vector
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// to `vec3(vert_position.xy, 1.0)`
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gl_Position = vec4(mat2(modelview_matrix) * vert_position + modelview_matrix[2], 0.0, 1.0);
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frag_tex_coord = vert_tex_coord;
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}
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