[nostalgia] Start on new TileSheetEditor

src/nostalgia/core/studio/tilesheetpixelgrid.hpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2016 - 2021 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#include <imgui.h>
+
+#include <nostalgia/common/point.hpp>
+#include <nostalgia/core/gfx.hpp>
+#include <nostalgia/glutils/glutils.hpp>
+#include <nostalgia/studio/studio.hpp>
+
+namespace nostalgia::core {
+
+class TileSheetGrid {
+
+	private:
+		static constexpr auto VertexVboRows = 1;
+		static constexpr auto VertexVboRowLength = 4;
+		static constexpr auto VertexVboLength = VertexVboRows * VertexVboRowLength;
+		static constexpr auto VertexEboLength = 1;
+
+		static constexpr auto VShad = R"(
+		{}
+		in vec2 vPt1;
+		in vec2 vPt2;
+		out VS_OUT {
+			vec2 pt1;
+			vec2 pt2;
+		} vs_out;
+		void main() {
+			vs_out.pt1 = vPt1;
+			vs_out.pt2 = vPt2;
+			gl_Position = vec4(vPt1, 0.0, 1.0);
+		})";
+
+		static constexpr auto FShad = R"(
+		{}
+		in vec3 fColor;
+		out vec4 outColor;
+		void main() {
+			outColor = vec4(0.4431, 0.4901, 0.4941, 1.0);
+		})";
+
+		static constexpr auto GShad = R"glsl(
+		{}
+		in VS_OUT {
+			vec2 pt1;
+			vec2 pt2;
+		} gs_in[];
+		layout(line_strip, max_vertices = 2) out;
+		void main() {
+			//gl_Position = vec4(gs_in[0].pt1, 0, 0);
+			//EmitVertex();
+			//gl_Position = vec4(gs_in[0].pt2, 0, 0);
+			//EmitVertex();
+			//EndPrimitive();
+		})glsl";
+
+		glutils::GLProgram m_shader;
+		glutils::BufferSet m_bufferSet;
+
+	public:
+		ox::Error buildShader() noexcept;
+
+		void draw(bool update) noexcept;
+
+		void initBufferSet(const NostalgiaGraphic &img) noexcept;
+
+	private:
+		static void setBufferObject(unsigned vertexRow, common::Point pt1, common::Point pt2, float *vbo, GLuint *ebo) noexcept;
+
+		void setBufferObjects(const NostalgiaGraphic &img, glutils::BufferSet *bg) noexcept;
+
+		static class ImVec2 pixelSize() noexcept;
+
+};
+
+}