From 445caf6184cafbce361670ea6028ff76317976bc Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 2 Oct 2022 15:29:41 +0200
Subject: a

---
 shaders/tile-shader.cpp | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
 shaders/tile-shader.hpp | 41 +++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 shaders/tile-shader.cpp
 create mode 100644 shaders/tile-shader.hpp

(limited to 'shaders')

diff --git a/shaders/tile-shader.cpp b/shaders/tile-shader.cpp
new file mode 100644
index 00000000..835f94a0
--- /dev/null
+++ b/shaders/tile-shader.cpp
@@ -0,0 +1,54 @@
+#include "shaders/tile-shader.hpp"
+#include "loader.hpp"
+#include <algorithm>
+#include <Corrade/Containers/Reference.h>
+#include <Corrade/Utility/Resource.h>
+#include <Magnum/GL/Context.h>
+#include <Magnum/GL/Shader.h>
+#include <Magnum/GL/Version.h>
+
+namespace Magnum::Examples {
+
+tile_shader::tile_shader()
+{
+    MAGNUM_ASSERT_GL_VERSION_SUPPORTED(GL::Version::GL460);
+
+    GL::Shader vert{GL::Version::GL460, GL::Shader::Type::Vertex};
+    GL::Shader frag{GL::Version::GL460, GL::Shader::Type::Fragment};
+
+    vert.addSource(loader.shader("shaders/tile-shader.vert"));
+    frag.addSource(loader.shader("shaders/tile-shader.frag"));
+
+#ifdef __clang__
+#   pragma clang diagnostic push
+#   pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#endif
+    CORRADE_INTERNAL_ASSERT_OUTPUT(GL::Shader::compile({vert, frag}));
+#ifdef __clang__
+#   pragma clang diagnostic pop
+#endif
+    attachShaders({vert, frag});
+
+    CORRADE_INTERNAL_ASSERT_OUTPUT(link());
+
+    set_scale({640, 480});
+    set_camera_offset({0, 0});
+}
+
+tile_shader& tile_shader::set_scale(const Vector2& scale)
+{
+    scale_ = scale;
+    setUniform(ScaleUniform, scale);
+    return *this;
+}
+
+tile_shader& tile_shader::set_camera_offset(Vector2 camera_offset)
+{
+    CORRADE_INTERNAL_ASSERT(std::fabs(camera_offset[0]) <= std::scalbn(1.f, std::numeric_limits<float>::digits));
+    CORRADE_INTERNAL_ASSERT(std::fabs(camera_offset[1]) <= std::scalbn(1.f, std::numeric_limits<float>::digits));
+    camera_offset_ = camera_offset;
+    setUniform(OffsetUniform, camera_offset);
+    return *this;
+}
+
+} // namespace Magnum::Examples
diff --git a/shaders/tile-shader.hpp b/shaders/tile-shader.hpp
new file mode 100644
index 00000000..a1975daf
--- /dev/null
+++ b/shaders/tile-shader.hpp
@@ -0,0 +1,41 @@
+#pragma once
+#include "tile-atlas.hpp"
+#include <vector>
+#include <utility>
+#include <Magnum/GL/AbstractShaderProgram.h>
+#include <Magnum/GL/Texture.h>
+#include <Magnum/Math/Color.h>
+#include <Magnum/Math/Vector2.h>
+#include <Magnum/Math/Matrix4.h>
+
+struct tile_atlas;
+
+namespace Magnum::Examples {
+
+struct tile_shader : GL::AbstractShaderProgram
+{
+    typedef GL::Attribute<0, Vector3> Position;
+    typedef GL::Attribute<1, Vector2> TextureCoordinates;
+
+    explicit tile_shader();
+
+    Vector2 scale() const { return scale_; }
+    tile_shader& set_scale(const Vector2& scale);
+    Vector2 camera_offset() const { return camera_offset_; }
+    tile_shader& set_camera_offset(Vector2 camera_offset);
+
+    static inline Vector2 project(Vector3 pt);
+
+private:
+    Vector2 scale_, camera_offset_;
+
+    enum { ScaleUniform = 0, OffsetUniform = 1, };
+};
+
+Vector2 tile_shader::project(Vector3 pt)
+{
+    float x = pt[1], y = pt[0], z = pt[2];
+    return { x-y, (x+y+z*2)*.75f };
+}
+
+} // namespace Magnum::Examples
-- 
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