From 0cea9c894eb514c70ff7c8edd0ccfa59c1f07a1a Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 18 Nov 2022 21:41:15 +0000
Subject: Save size of output in SceneRender and set viewport accordingly

---
 ui/gameMainWindow.cpp |  2 +-
 ui/sceneRenderer.cpp  | 10 ++++++----
 ui/sceneRenderer.h    |  1 +
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/ui/gameMainWindow.cpp b/ui/gameMainWindow.cpp
index e49f4a9..c31265a 100644
--- a/ui/gameMainWindow.cpp
+++ b/ui/gameMainWindow.cpp
@@ -29,7 +29,7 @@ public:
 };
 
 GameMainWindow::GameMainWindow(size_t w, size_t h) :
-	Window {w, h, "I Like Trains", SDL_WINDOW_OPENGL}, SceneRenderer {size, 0}
+	Window {w, h, "I Like Trains", SDL_WINDOW_OPENGL}, SceneRenderer {Window::size, 0}
 {
 	uiComponents.create<ManualCameraController>(glm::vec2 {-1150, -1150});
 	auto gms = uiComponents.create<GameMainSelector>(&camera, glm::vec2 {w, h});
diff --git a/ui/sceneRenderer.cpp b/ui/sceneRenderer.cpp
index 6986fb6..6a68ac6 100644
--- a/ui/sceneRenderer.cpp
+++ b/ui/sceneRenderer.cpp
@@ -11,8 +11,8 @@ static constexpr std::array<glm::vec4, 4> displayVAOdata {{
 		{1.0f, 1.0f, 1.0f, 1.0f},
 		{1.0f, -1.0f, 1.0f, 0.0f},
 }};
-SceneRenderer::SceneRenderer(glm::ivec2 size, GLuint o) :
-	camera {{-1250.0F, -1250.0F, 35.0F}, quarter_pi, ratio(size), 0.1F, 10000.0F}, output {o},
+SceneRenderer::SceneRenderer(glm::ivec2 s, GLuint o) :
+	camera {{-1250.0F, -1250.0F, 35.0F}, quarter_pi, ratio(s), 0.1F, 10000.0F}, size {s}, output {o},
 	lighting {lightingShader_vs, lightingShader_fs}
 {
 	glBindVertexArray(displayVAO);
@@ -24,7 +24,7 @@ SceneRenderer::SceneRenderer(glm::ivec2 size, GLuint o) :
 
 	glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
 	const auto configuregdata
-			= [size](const GLuint data, const GLint format, const GLenum type, const GLenum attachment) {
+			= [this](const GLuint data, const GLint format, const GLenum type, const GLenum attachment) {
 				  glBindTexture(GL_TEXTURE_2D, data);
 				  glTexImage2D(GL_TEXTURE_2D, 0, format, size.x, size.y, 0, GL_RGBA, type, NULL);
 				  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ -53,6 +53,8 @@ void
 SceneRenderer::render(std::function<void(const SceneShader &)> content) const
 {
 	shader.setView(camera.GetViewProjection());
+	glViewport(0, 0, size.x, size.y);
+
 	// Geometry pass
 	glEnable(GL_BLEND);
 	glEnable(GL_CULL_FACE);
@@ -62,9 +64,9 @@ SceneRenderer::render(std::function<void(const SceneShader &)> content) const
 	glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	content(shader);
-	glBindFramebuffer(GL_FRAMEBUFFER, output);
 
 	// Lighting pass
+	glBindFramebuffer(GL_FRAMEBUFFER, output);
 	glDisable(GL_BLEND);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glActiveTexture(GL_TEXTURE0);
diff --git a/ui/sceneRenderer.h b/ui/sceneRenderer.h
index 50feaa2..c06fa83 100644
--- a/ui/sceneRenderer.h
+++ b/ui/sceneRenderer.h
@@ -16,6 +16,7 @@ public:
 	Camera camera;
 
 private:
+	glm::ivec2 size;
 	GLuint output;
 	glFrameBuffer gBuffer;
 	glTexture gPosition, gNormal, gAlbedoSpec;
-- 
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