From 2c6257a4460de7b0c75723aebf96cf265e078530 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 24 Feb 2023 19:29:27 +0000
Subject: Support for model colours mixed with textures

---
 gfx/gl/shaders/basicShader.fs    | 3 ++-
 gfx/gl/shaders/basicShader.vs    | 3 +++
 gfx/gl/shaders/landmassShader.vs | 3 +++
 gfx/models/mesh.cpp              | 2 +-
 gfx/models/vertex.hpp            | 5 +++--
 5 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/gfx/gl/shaders/basicShader.fs b/gfx/gl/shaders/basicShader.fs
index 9c4945b..93f0a3f 100644
--- a/gfx/gl/shaders/basicShader.fs
+++ b/gfx/gl/shaders/basicShader.fs
@@ -3,6 +3,7 @@
 in vec3 FragPos;
 in vec2 TexCoords;
 in vec3 Normal;
+in vec4 Colour;
 
 out vec4 gPosition;
 out vec4 gNormal;
@@ -16,5 +17,5 @@ main()
 	float clear = round(texture(texture0, TexCoords).a);
 	gPosition = vec4(FragPos, clear);
 	gNormal = vec4(Normal, clear);
-	gAlbedoSpec = texture(texture0, TexCoords);
+	gAlbedoSpec = mix(texture(texture0, TexCoords), vec4(Colour.rgb, 1), Colour.a);
 }
diff --git a/gfx/gl/shaders/basicShader.vs b/gfx/gl/shaders/basicShader.vs
index bc7ea5d..ff9a401 100644
--- a/gfx/gl/shaders/basicShader.vs
+++ b/gfx/gl/shaders/basicShader.vs
@@ -3,10 +3,12 @@
 in vec3 position;
 in vec2 texCoord;
 in vec3 normal;
+in vec4 colour;
 
 out vec3 FragPos;
 out vec2 TexCoords;
 out vec3 Normal;
+out vec4 Colour;
 
 uniform mat4 viewProjection;
 uniform mat4 model;
@@ -19,6 +21,7 @@ main()
 	FragPos = worldPos.xyz;
 	TexCoords = texCoord;
 	Normal = (model * vec4(normal, 0.0)).xyz;
+	Colour = colour;
 
 	gl_Position = viewProjection * worldPos;
 }
diff --git a/gfx/gl/shaders/landmassShader.vs b/gfx/gl/shaders/landmassShader.vs
index 6bf39b0..30c4ef4 100644
--- a/gfx/gl/shaders/landmassShader.vs
+++ b/gfx/gl/shaders/landmassShader.vs
@@ -3,10 +3,12 @@
 in vec3 position;
 in vec2 texCoord;
 in vec3 normal;
+in vec4 colour;
 
 out vec3 FragPos;
 out vec2 TexCoords;
 out vec3 Normal;
+out vec4 Colour;
 
 uniform mat4 viewProjection;
 
@@ -16,6 +18,7 @@ main()
 	FragPos = position;
 	TexCoords = texCoord;
 	Normal = normal;
+	Colour = colour;
 
 	gl_Position = viewProjection * vec4(position, 1.0);
 }
diff --git a/gfx/models/mesh.cpp b/gfx/models/mesh.cpp
index 85be84c..3db1ad5 100644
--- a/gfx/models/mesh.cpp
+++ b/gfx/models/mesh.cpp
@@ -7,7 +7,7 @@
 Mesh::Mesh(const std::span<const Vertex> vertices, const std::span<const unsigned int> indices, GLenum m) :
 	m_numIndices {static_cast<GLsizei>(indices.size())}, mode {m}
 {
-	VertexArrayObject<Vertex>::configure<&Vertex::pos, &Vertex::texCoord, &Vertex::normal>(
+	VertexArrayObject<Vertex>::configure<&Vertex::pos, &Vertex::texCoord, &Vertex::normal, &Vertex::colour>(
 			m_vertexArrayObject, m_vertexArrayBuffers[0], m_vertexArrayBuffers[1], vertices, indices);
 }
 
diff --git a/gfx/models/vertex.hpp b/gfx/models/vertex.hpp
index 095c82f..325aab1 100644
--- a/gfx/models/vertex.hpp
+++ b/gfx/models/vertex.hpp
@@ -4,12 +4,13 @@
 
 class Vertex {
 public:
-	constexpr Vertex(glm::vec3 pos, glm::vec2 texCoord, glm::vec3 normal) :
-		pos {std::move(pos)}, texCoord {std::move(texCoord)}, normal {std::move(normal)}
+	constexpr Vertex(glm::vec3 pos, glm::vec2 texCoord, glm::vec3 normal, glm::vec4 colour = {}) :
+		pos {std::move(pos)}, texCoord {std::move(texCoord)}, normal {std::move(normal)}, colour {std::move(colour)}
 	{
 	}
 
 	glm::vec3 pos;
 	glm::vec2 texCoord;
 	glm::vec3 normal;
+	glm::vec4 colour;
 };
-- 
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