Add custom transorm matrix

programs/hqOffline.c

@@ -14,6 +14,8 @@
 #include <stdio.h>
 #include <math.h>
 
+#include "grassTexture.h"
+
 uint8_t frameBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y * 3];
 
 int frame = 0;
@@ -64,6 +66,21 @@ S3L_Vec4 toLightDirection;
 
 S3L_Vec4 n0, n1, n2, v0, v1, v2;
 
+void sampleTexture(uint8_t *texture, int w, int h, float x, float y, char color[3])
+{
+  x = fmod(x,1.0);
+  y = fmod(y,1.0);
+
+  int intX = x * w;
+  int intY = y * h;
+
+  int index = S3L_clamp((intY * w + intX) * 3,0,w * h - 1);
+
+  color[0] = texture[index];
+  color[1] = texture[index + 1];
+  color[2] = texture[index + 2];
+}
+
 void drawPixel(S3L_PixelInfo *p)
 {
   S3L_Unit *normals = p->modelIndex == 0 ? terrainNormals : waterNormals;
@@ -199,9 +216,16 @@ color[2] = fresnel2 * 255 + fresnel * 100;
   }
   else
   {
-    color[0] = S3L_clamp(255 * light,0,255);
+
-    color[1] = S3L_clamp(100 * light,0,255);
+char textureColor[3];
-    color[2] = S3L_clamp(50 * light,0,255);
+
+sampleTexture(grassTexture,GRASS_TEXTURE_WIDTH,GRASS_TEXTURE_HEIGHT,
+position.x / ((float) S3L_FRACTIONS_PER_UNIT),
+position.z / ((float) S3L_FRACTIONS_PER_UNIT),textureColor);
+
+    color[0] = S3L_clamp(textureColor[0] * light,0,255);
+    color[1] = S3L_clamp(textureColor[1] * light,0,255);
+    color[2] = S3L_clamp(textureColor[2] * light,0,255);
   }
 
 /*

programs/modelViewer.c

@@ -432,6 +432,12 @@ int main()
 
   S3L_initScene(&model,1,&scene);
 
+  S3L_initModel3D(houseVertices,HOUSE_VERTEX_COUNT,houseTriangleIndices,HOUSE_TRIANGLE_COUNT,&houseModel);
+  S3L_initModel3D(chestVertices,CHEST_VERTEX_COUNT,chestTriangleIndices,CHEST_TRIANGLE_COUNT,&chestModel);
+  S3L_initModel3D(plantVertices,PLANT_VERTEX_COUNT,plantTriangleIndices,PLANT_TRIANGLE_COUNT,&plantModel);
+  S3L_initModel3D(cat1Vertices,CAT1_VERTEX_COUNT,cat1TriangleIndices,CAT1_TRIANGLE_COUNT,&cat1Model);
+  S3L_initModel3D(cat2Vertices,CAT2_VERTEX_COUNT,cat1TriangleIndices,CAT1_TRIANGLE_COUNT,&cat2Model);
+
   scene.camera.transform.translation.z = -S3L_FRACTIONS_PER_UNIT * 8;
 
   catModel = cat1Model;

small3dlib.h

@@ -431,6 +431,10 @@ typedef struct
   const S3L_Index *triangles;
   S3L_Index triangleCount;
   S3L_Transform3D transform;
+  S3L_Mat4 *customTransformMatrix; /**< This can be used to override the
+                                     transform (if != 0) with a custom
+                                     transform matrix, which is more
+                                     general. */
   S3L_DrawConfig config;
 } S3L_Model3D;                ///< Represents a 3D model.
 
@@ -1458,7 +1462,8 @@ void S3L_initModel3D(
   model->vertexCount = vertexCount;
   model->triangles = triangles;
   model->triangleCount = triangleCount;
-  
+  model->customTransformMatrix = 0;  
+
   S3L_initTransoform3D(&(model->transform));
   S3L_initDrawConfig(&(model->config));
 }
@@ -2355,7 +2360,17 @@ void S3L_drawScene(S3L_Scene scene)
     previousModel = modelIndex;
 #endif
 
-    S3L_makeWorldMatrix(scene.models[modelIndex].transform,&matFinal);
+    if (scene.models[modelIndex].customTransformMatrix == 0)
+      S3L_makeWorldMatrix(scene.models[modelIndex].transform,&matFinal);
+    else
+    {
+      S3L_Mat4 *m = scene.models[modelIndex].customTransformMatrix;
+
+      for (int8_t j = 0; j < 4; ++j)
+        for (int8_t i = 0; i < 4; ++i)
+           matFinal[i][j] = (*m)[i][j];
+    }
+
     S3L_mat4Xmat4(&matFinal,&matCamera);
 
     S3L_Index triangleCount = scene.models[modelIndex].triangleCount;