[rlgl] Allow tint colors in GL_LINE (wires) and GL_POINT (points) draw modes on OpenGL 1.1 clean (#5207)

* gate with OPENGL_11 prototype and definition for rlSetPointSize and rlGetPointSize

* gate with OPENGL_11 prototype and definition for rlSetPointSize and rlGetPointSize

* more coverage for fixing expected texcoords, normals, and colors

* fix guard styling

* fix guard issue, and remove fallback unneccessary else clause (default shader ill work)

* opengl3.3 and es2 need the color array allocated in order to allow for updates later (unlike opengl11)

src/rlgl.h

@@ -644,10 +644,8 @@ RLAPI void rlEnableVertexBufferElement(unsigned int id); // Enable vertex buffer
 RLAPI void rlDisableVertexBufferElement(void);          // Disable vertex buffer element (VBO element)
 RLAPI void rlEnableVertexAttribute(unsigned int index); // Enable vertex attribute index
 RLAPI void rlDisableVertexAttribute(unsigned int index); // Disable vertex attribute index
-#if defined(GRAPHICS_API_OPENGL_11)
 RLAPI void rlEnableStatePointer(int vertexAttribType, void *buffer); // Enable attribute state pointer
 RLAPI void rlDisableStatePointer(int vertexAttribType); // Disable attribute state pointer
-#endif
 
 // Textures state
 RLAPI void rlActiveTextureSlot(int slot);               // Select and active a texture slot
@@ -686,6 +684,8 @@ RLAPI void rlDisableScissorTest(void);                  // Disable scissor test
 RLAPI void rlScissor(int x, int y, int width, int height); // Scissor test
 RLAPI void rlEnablePointMode(void);                     // Enable point mode
 RLAPI void rlDisablePointMode(void);                    // Disable point mode
+RLAPI void rlSetPointSize(float size);                  // Set the point drawing size
+RLAPI float rlGetPointSize(void);                       // Get the point drawing size
 RLAPI void rlEnableWireMode(void);                      // Enable wire mode
 RLAPI void rlDisableWireMode(void);                     // Disable wire mode
 RLAPI void rlSetLineWidth(float width);                 // Set the line drawing width
@@ -2016,6 +2016,25 @@ float rlGetLineWidth(void)
     return width;
 }
 
+// Set the point drawing size
+void rlSetPointSize(float size)
+{
+#if defined(GRAPHICS_API_OPENGL_11)
+    glPointSize(size);
+#endif
+}
+
+// Get the point drawing size
+float rlGetPointSize(void)
+{
+    float size = 1;
+#if defined(GRAPHICS_API_OPENGL_11)
+    glGetFloatv(GL_POINT_SIZE, &size);
+#endif
+    return size;
+
+}
+
 // Enable line aliasing
 void rlEnableSmoothLines(void)
 {
@@ -4003,10 +4022,10 @@ void rlDrawVertexArrayElementsInstanced(int offset, int count, const void *buffe
 #endif
 }
 
-#if defined(GRAPHICS_API_OPENGL_11)
 // Enable vertex state pointer
 void rlEnableStatePointer(int vertexAttribType, void *buffer)
 {
+#if defined(GRAPHICS_API_OPENGL_11)
     if (buffer != NULL) glEnableClientState(vertexAttribType);
     switch (vertexAttribType)
     {
@@ -4017,14 +4036,16 @@ void rlEnableStatePointer(int vertexAttribType, void *buffer)
         //case GL_INDEX_ARRAY: if (buffer != NULL) glIndexPointer(GL_SHORT, 0, buffer); break; // Indexed colors
         default: break;
     }
+#endif
 }
 
 // Disable vertex state pointer
 void rlDisableStatePointer(int vertexAttribType)
 {
+#if defined(GRAPHICS_API_OPENGL_11)
     glDisableClientState(vertexAttribType);
-}
 #endif
+}
 
 // Load vertex array object (VAO)
 unsigned int rlLoadVertexArray(void)

src/rmodels.c

@@ -1293,10 +1293,19 @@ void UploadMesh(Mesh *mesh, bool dynamic)
     rlEnableVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_POSITION);
 
     // Enable vertex attributes: texcoords (shader-location = 1)
+
+    if (mesh->texcoords != NULL)
+    {
         mesh->vboId[RL_DEFAULT_SHADER_ATTRIB_LOCATION_TEXCOORD] = rlLoadVertexBuffer(mesh->texcoords, mesh->vertexCount*2*sizeof(float), dynamic);
         rlSetVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TEXCOORD, 2, RL_FLOAT, 0, 0, 0);
         rlEnableVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TEXCOORD);
-
+    }
+    else
+    {
+        float value[2] = { 0.0f, 0.0f };
+        rlSetVertexAttributeDefault(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TEXCOORD, value, SHADER_ATTRIB_VEC2, 2);
+        rlDisableVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TEXCOORD);
+    }
     // WARNING: When setting default vertex attribute values, the values for each generic vertex attribute
     // is part of current state, and it is maintained even if a different program object is used
 
@@ -1431,12 +1440,12 @@ void DrawMesh(Mesh mesh, Material material, Matrix transform)
     if (mesh.animVertices) rlEnableStatePointer(GL_VERTEX_ARRAY, mesh.animVertices);
     else rlEnableStatePointer(GL_VERTEX_ARRAY, mesh.vertices);
 
-    rlEnableStatePointer(GL_TEXTURE_COORD_ARRAY, mesh.texcoords);
+    if (mesh.texcoords) rlEnableStatePointer(GL_TEXTURE_COORD_ARRAY, mesh.texcoords);
 
     if (mesh.animNormals) rlEnableStatePointer(GL_NORMAL_ARRAY, mesh.animNormals);
-    else rlEnableStatePointer(GL_NORMAL_ARRAY, mesh.normals);
+    else if (mesh.normals) rlEnableStatePointer(GL_NORMAL_ARRAY, mesh.normals);
 
-    rlEnableStatePointer(GL_COLOR_ARRAY, mesh.colors);
+    if (mesh.colors) rlEnableStatePointer(GL_COLOR_ARRAY, mesh.colors);
 
     rlPushMatrix();
         rlMultMatrixf(MatrixToFloat(transform));
@@ -3836,6 +3845,7 @@ void DrawModelWiresEx(Model model, Vector3 position, Vector3 rotationAxis, float
 
 // Draw a model points
 // WARNING: OpenGL ES 2.0 does not support point mode drawing
+// TODO: gate these properly for non es 2.0 versions only
 void DrawModelPoints(Model model, Vector3 position, float scale, Color tint)
 {
     rlEnablePointMode();
@@ -4420,7 +4430,11 @@ static Model LoadOBJ(const char *fileName)
         model.meshes[i].vertices = (float *)MemAlloc(sizeof(float)*vertexCount*3);
         model.meshes[i].normals = (float *)MemAlloc(sizeof(float)*vertexCount*3);
         model.meshes[i].texcoords = (float *)MemAlloc(sizeof(float)*vertexCount*2);
+    #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
         model.meshes[i].colors = (unsigned char *)MemAlloc(sizeof(unsigned char)*vertexCount*4);
+    #else
+        model.meshes[i].colors = NULL;
+    #endif
     }
 
     MemFree(localMeshVertexCounts);
@@ -4474,7 +4488,17 @@ static Model LoadOBJ(const char *fileName)
 
             for (int i = 0; i < 3; i++) model.meshes[meshIndex].vertices[localMeshVertexCount*3 + i] = objAttributes.vertices[vertIndex*3 + i];
 
+            if (objAttributes.texcoords != NULL && texcordIndex != TINYOBJ_INVALID_INDEX && texcordIndex >= 0)
+            {
                 for (int i = 0; i < 2; i++) model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + i] = objAttributes.texcoords[texcordIndex*2 + i];
+                model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1] = 1.0f - model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1];
+            }
+            else
+            {
+                model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 0] = 0.0f;
+                model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1] = 0.0f;
+            }
+
             if (objAttributes.normals != NULL && normalIndex != TINYOBJ_INVALID_INDEX && normalIndex >= 0)
             {
                 for (int i = 0; i < 3; i++) model.meshes[meshIndex].normals[localMeshVertexCount*3 + i] = objAttributes.normals[normalIndex*3 + i];
@@ -4485,11 +4509,9 @@ static Model LoadOBJ(const char *fileName)
                 model.meshes[meshIndex].normals[localMeshVertexCount*3 + 1] = 1.0f;
                 model.meshes[meshIndex].normals[localMeshVertexCount*3 + 2] = 0.0f;
             }
-
+        #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
-            model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1] = 1.0f - model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1];
-
             for (int i = 0; i < 4; i++) model.meshes[meshIndex].colors[localMeshVertexCount*4 + i] = 255;
-
+        #endif
             faceVertIndex++;
             localMeshVertexCount++;
         }