Material:getTransform; Material:setTransform;

src/api/types/material.c

@@ -62,6 +62,29 @@ int l_lovrMaterialSetTexture(lua_State* L) {
   return 0;
 }
 
+int l_lovrMaterialGetTransform(lua_State* L) {
+  Material* material = luax_checktype(L, 1, Material);
+  float ox, oy, sx, sy, angle;
+  lovrMaterialGetTransform(material, &ox, &oy,  &sx, &sy, &angle);
+  lua_pushnumber(L, ox);
+  lua_pushnumber(L, oy);
+  lua_pushnumber(L, sx);
+  lua_pushnumber(L, sy);
+  lua_pushnumber(L, angle);
+  return 5;
+}
+
+int l_lovrMaterialSetTransform(lua_State* L) {
+  Material* material = luax_checktype(L, 1, Material);
+  float ox = luaL_optnumber(L, 2, 0.f);
+  float oy = luaL_optnumber(L, 3, 0.f);
+  float sx = luaL_optnumber(L, 4, 1.f);
+  float sy = luaL_optnumber(L, 5, sx);
+  float angle = luaL_optnumber(L, 6, 0.f);
+  lovrMaterialSetTransform(material, ox, oy, sx, sy, angle);
+  return 0;
+}
+
 const luaL_Reg lovrMaterial[] = {
   { "getColor", l_lovrMaterialGetColor },
   { "setColor", l_lovrMaterialSetColor },
@@ -69,5 +92,7 @@ const luaL_Reg lovrMaterial[] = {
   { "setScalar", l_lovrMaterialSetScalar },
   { "getTexture", l_lovrMaterialGetTexture },
   { "setTexture", l_lovrMaterialSetTexture },
+  { "getTransform", l_lovrMaterialGetTransform },
+  { "setTransform", l_lovrMaterialSetTransform },
   { NULL, NULL }
 };

src/graphics/material.c

@@ -1,4 +1,5 @@
 #include "graphics/material.h"
+#include <math.h>
 #include <stdlib.h>
 
 Material* lovrMaterialCreate() {
@@ -13,6 +14,8 @@ Material* lovrMaterialCreate() {
     material->colors[i] = (Color) { 1, 1, 1, 1 };
   }
 
+  lovrMaterialSetTransform(material, 0, 0, 1, 1, 0);
+
   return material;
 }
 
@@ -51,3 +54,25 @@ void lovrMaterialSetTexture(Material* material, MaterialTexture textureType, Tex
     material->textures[textureType] = texture;
   }
 }
+
+void lovrMaterialGetTransform(Material* material, float* ox, float* oy, float* sx, float* sy, float* angle) {
+  *ox = material->transform[6];
+  *oy = material->transform[7];
+  *sx = sqrt(material->transform[0] * material->transform[0] + material->transform[1] * material->transform[1]);
+  *sy = sqrt(material->transform[3] * material->transform[3] + material->transform[4] * material->transform[4]);
+  *angle = atan2(-material->transform[3], material->transform[0]);
+}
+
+void lovrMaterialSetTransform(Material* material, float ox, float oy, float sx, float sy, float angle) {
+  float c = cos(angle);
+  float s = sin(angle);
+  material->transform[0] = c * sx;
+  material->transform[1] = s * sx;
+  material->transform[2] = 0;
+  material->transform[3] = -s * sy;
+  material->transform[4] = c * sy;
+  material->transform[5] = 0;
+  material->transform[6] = ox;
+  material->transform[7] = oy;
+  material->transform[8] = 1;
+}

src/graphics/material.h

@@ -32,6 +32,7 @@ typedef struct {
   float scalars[MAX_MATERIAL_SCALARS];
   Color colors[MAX_MATERIAL_COLORS];
   Texture* textures[MAX_MATERIAL_TEXTURES];
+  float transform[9];
   bool isDefault;
 } Material;
 
@@ -43,3 +44,5 @@ Color lovrMaterialGetColor(Material* material, MaterialColor colorType);
 void lovrMaterialSetColor(Material* material, MaterialColor colorType, Color color);
 Texture* lovrMaterialGetTexture(Material* material, MaterialTexture textureType);
 void lovrMaterialSetTexture(Material* material, MaterialTexture textureType, Texture* texture);
+void lovrMaterialGetTransform(Material* material, float* ox, float* oy, float* sx, float* sy, float* angle);
+void lovrMaterialSetTransform(Material* material, float ox, float oy, float sx, float sy, float angle);

src/graphics/opengl.c

@@ -680,6 +680,8 @@ void lovrGpuDraw(DrawCommand* command) {
     lovrShaderSetTexture(shader, lovrShaderTextureUniforms[i], &texture, 1);
   }
 
+  lovrShaderSetMatrix(shader, "lovrMaterialTransform", material->transform, 9);
+
   // Canvas
   Canvas** canvas = pipeline->canvasCount > 0 ? pipeline->canvas : &command->camera.canvas;
   int canvasCount = pipeline->canvasCount > 0 ? pipeline->canvasCount : (command->camera.canvas != NULL);

src/resources/shaders.c

@@ -43,6 +43,7 @@ const char* lovrShaderVertexPrefix = ""
 "uniform mat4 lovrProjection; \n"
 "uniform mat4 lovrTransform; \n"
 "uniform mat3 lovrNormalMatrix; \n"
+"uniform mat3 lovrMaterialTransform; \n"
 "uniform float lovrPointSize; \n"
 "uniform mat4 lovrPose[MAX_BONES]; \n"
 "#line 0 \n";
@@ -76,7 +77,7 @@ const char* lovrShaderFragmentPrefix = ""
 
 const char* lovrShaderVertexSuffix = ""
 "void main() { \n"
-"  texCoord = lovrTexCoord; \n"
+"  texCoord = (lovrMaterialTransform * vec3(lovrTexCoord, 1.)).xy; \n"
 "  vertexColor = lovrVertexColor; \n"
 "  mat4 pose = \n"
 "    lovrPose[lovrBones[0]] * lovrBoneWeights[0] + \n"