add modeltree:set_texture

src/graphics/render/ModelBatch.hpp

@@ -1,9 +1,12 @@
 #ifndef GRAPHICS_RENDER_MODEL_BATCH_HPP_
 #define GRAPHICS_RENDER_MODEL_BATCH_HPP_
 
+#include "../../maths/UVRegion.hpp"
+
 #include <memory>
 #include <vector>
 #include <glm/glm.hpp>
+#include <unordered_map>
 
 class Mesh;
 class Texture;
@@ -15,6 +18,8 @@ namespace model {
     struct Model;
 }
 
+using texture_names_map = std::unordered_map<std::string, std::string>;
+
 class ModelBatch {
     std::unique_ptr<float[]> const buffer;
     size_t const capacity;
@@ -30,6 +35,7 @@ class ModelBatch {
     Assets* assets;
     Chunks* chunks;
     Texture* texture = nullptr;
+    UVRegion region {0.0f, 0.0f, 1.0f, 1.0f};
 
     static inline glm::vec3 SUN_VECTOR {0.411934f, 0.863868f, -0.279161f};
 
@@ -40,8 +46,8 @@ class ModelBatch {
         buffer[index++] = pos.x;
         buffer[index++] = pos.y;
         buffer[index++] = pos.z;
-        buffer[index++] = uv.x;
-        buffer[index++] = uv.y;
+        buffer[index++] = uv.x * region.getWidth() + region.u1;
+        buffer[index++] = uv.y * region.getHeight() + region.v1;
 
         union {
             float floating;
@@ -72,8 +78,11 @@ class ModelBatch {
         vertex(pos-right+up, {0,1}, color);
     }
 
-    void draw(const model::Mesh& mesh, const glm::mat4& matrix, const glm::mat3& rotation);
+    void draw(const model::Mesh& mesh, const glm::mat4& matrix, 
+              const glm::mat3& rotation, const texture_names_map* varTextures);
     void box(glm::vec3 pos, glm::vec3 size, glm::vec4 lights);
+    void setTexture(const std::string& name,
+                    const texture_names_map* varTextures);
     void setTexture(Texture* texture);
     void flush();
 
@@ -81,6 +90,7 @@ class ModelBatch {
         glm::mat4 matrix;
         glm::mat3 rotation;
         const model::Mesh* mesh;
+        const texture_names_map* varTextures;
     };
     std::vector<DrawEntry> entries;
 public:
@@ -93,7 +103,8 @@ public:
 
     void pushMatrix(glm::mat4 matrix);
     void popMatrix();
-    void draw(const model::Model* model);
+    void draw(const model::Model* model,
+              const texture_names_map* varTextures);
 
     void render();
 };