From 5b415937c6c7097373bfd754b5699a9946c2cd16 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 23 Nov 2022 17:53:32 +0000
Subject: Support setting a viewPort uniform for those shaders which need it

---
 gfx/gl/sceneShader.cpp | 17 +++++++++++++++++
 gfx/gl/sceneShader.h   |  6 +++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/sceneShader.cpp b/gfx/gl/sceneShader.cpp
index b20b1db..0b0c530 100644
--- a/gfx/gl/sceneShader.cpp
+++ b/gfx/gl/sceneShader.cpp
@@ -24,6 +24,14 @@ SceneShader::setViewProjection(const glm::mat4 & viewProjection) const
 	}
 }
 
+void
+SceneShader::setViewPort(const glm::ivec4 & viewPort) const
+{
+	for (const auto & prog : std::array<const SceneProgram *, 4> {&basic, &water, &landmass, &absolute}) {
+		prog->setViewPort(viewPort);
+	}
+}
+
 void
 SceneShader::SceneProgram::setViewProjection(const glm::mat4 & viewProjection) const
 {
@@ -31,6 +39,15 @@ SceneShader::SceneProgram::setViewProjection(const glm::mat4 & viewProjection) c
 	glUniformMatrix4fv(viewProjectionLoc, 1, GL_FALSE, glm::value_ptr(viewProjection));
 }
 
+void
+SceneShader::SceneProgram::setViewPort(const glm::ivec4 & viewPort) const
+{
+	if (viewPortLoc >= 0) {
+		glUseProgram(*this);
+		glUniform4iv(viewPortLoc, 1, glm::value_ptr(viewPort));
+	}
+}
+
 SceneShader::BasicProgram::BasicProgram() : SceneProgram {basicShader_vs, basicShader_fs}, modelLoc {*this, "model"} { }
 
 void
diff --git a/gfx/gl/sceneShader.h b/gfx/gl/sceneShader.h
index 8094e0a..99431f1 100644
--- a/gfx/gl/sceneShader.h
+++ b/gfx/gl/sceneShader.h
@@ -8,14 +8,17 @@ class SceneShader {
 	class SceneProgram : public Program {
 	public:
 		template<typename... S>
-		inline SceneProgram(const S &... srcs) : Program {srcs...}, viewProjectionLoc {*this, "viewProjection"}
+		inline SceneProgram(const S &... srcs) :
+			Program {srcs...}, viewProjectionLoc {*this, "viewProjection"}, viewPortLoc {*this, "viewPort"}
 		{
 		}
 
 		void setViewProjection(const glm::mat4 &) const;
+		void setViewPort(const glm::ivec4 &) const;
 
 	private:
 		RequiredUniformLocation viewProjectionLoc;
+		UniformLocation viewPortLoc;
 	};
 
 	class BasicProgram : public SceneProgram {
@@ -52,4 +55,5 @@ public:
 	AbsolutePosProgram landmass, absolute;
 
 	void setViewProjection(const glm::mat4 & viewProjection) const;
+	void setViewPort(const glm::ivec4 & viewPort) const;
 };
-- 
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