From 6c268e0f98722c3253366b639a3a0abe37c8835d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 12 Dec 2021 16:12:01 +0000
Subject: Introduce the UI shader

---
 gfx/gl/uiShader.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 gfx/gl/uiShader.cpp

(limited to 'gfx/gl/uiShader.cpp')

diff --git a/gfx/gl/uiShader.cpp b/gfx/gl/uiShader.cpp
new file mode 100644
index 0000000..2fbb0d4
--- /dev/null
+++ b/gfx/gl/uiShader.cpp
@@ -0,0 +1,14 @@
+#include "uiShader.h"
+#include <gfx/gl/shaders/fs-uiShader.h>
+#include <gfx/gl/shaders/vs-uiShader.h>
+#include <glm/gtc/type_ptr.hpp>
+#include <glm/gtx/transform.hpp>
+
+UIShader::UIShader(size_t width, size_t height) : program {uiShader_vs.compile(), uiShader_fs.compile()}
+{
+	if (auto loc = glGetUniformLocation(program.m_program, "uiProjection"); loc >= 0) {
+		glUseProgram(program.m_program);
+		const auto uiProjection = glm::ortho<float>(0, static_cast<float>(width), 0, static_cast<float>(height));
+		glUniformMatrix4fv(loc, 1, GL_FALSE, glm::value_ptr(uiProjection));
+	}
+}
-- 
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