lib/gamnit: intro GamnitProgram::diagnose

[nit.git] / lib / gamnit / depth / more_materials.nit

diff --git a/lib/gamnit/depth/more_materials.nit b/lib/gamnit/depth/more_materials.nit
index 453c7e4..613ff1a 100644 (file)
--- a/lib/gamnit/depth/more_materials.nit
+++ b/lib/gamnit/depth/more_materials.nit
@@ -29,13 +29,13 @@ class SmoothMaterial
                [1.0, 1.0, 1.0, 1.0])
 
        # Ambient color, always visible
-       var ambient_color: Array[Float]
+       var ambient_color: Array[Float] is writable
 
        # Diffuse color when covered by a light source
-       var diffuse_color: Array[Float]
+       var diffuse_color: Array[Float] is writable
 
        # Specular color affecting reflections
-       var specular_color: Array[Float]
+       var specular_color: Array[Float] is writable
 
        redef fun draw(actor, model)
        do
@@ -102,7 +102,8 @@ class TexturedMaterial
                var program = app.versatile_program
                program.use
 
-               var need_tex_coord = false
+               # One of the textures used, if any
+               var sample_used_texture = null
 
                var texture = ambient_texture
                if texture != null then
@@ -110,7 +111,7 @@ class TexturedMaterial
                        glBindTexture(gl_TEXTURE_2D, texture.gl_texture)
                        program.use_map_ambient.uniform true
                        program.map_ambient.uniform 0
-                       need_tex_coord = true
+                       sample_used_texture = texture
                else
                        program.use_map_ambient.uniform false
                end
@@ -121,7 +122,7 @@ class TexturedMaterial
                        glBindTexture(gl_TEXTURE_2D, texture.gl_texture)
                        program.use_map_diffuse.uniform true
                        program.map_diffuse.uniform 1
-                       need_tex_coord = true
+                       sample_used_texture = texture
                else
                        program.use_map_diffuse.uniform false
                end
@@ -132,7 +133,7 @@ class TexturedMaterial
                        glBindTexture(gl_TEXTURE_2D, texture.gl_texture)
                        program.use_map_specular.uniform true
                        program.map_specular.uniform 2
-                       need_tex_coord = true
+                       sample_used_texture = texture
                else
                        program.use_map_specular.uniform false
                end
@@ -140,8 +141,29 @@ class TexturedMaterial
                program.translation.uniform(actor.center.x, actor.center.y, actor.center.z, 0.0)
                program.scale.uniform actor.scale
 
-               program.tex_coord.array_enabled = need_tex_coord
-               program.tex_coord.array(mesh.texture_coords, 2)
+               # If using a texture, set `texture_coords`
+               program.tex_coord.array_enabled = sample_used_texture != null
+               if sample_used_texture != null then
+                       if sample_used_texture isa GamnitRootTexture then
+                               # Coordinates are directly valid
+                               program.tex_coord.array(mesh.texture_coords, 2)
+                       else
+                               # Correlate texture coordinates from the substexture and the mesh.
+                               # This is slow, but should be cached on the GPU.
+                               var xa = sample_used_texture.offset_left
+                               var xd = sample_used_texture.offset_right - xa
+                               var ya = sample_used_texture.offset_top
+                               var yd = sample_used_texture.offset_bottom - ya
+
+                               var tex_coords = new Array[Float].with_capacity(mesh.texture_coords.length)
+                               for i in [0..mesh.texture_coords.length/2[ do
+                                       tex_coords[i*2]   = xa + xd * mesh.texture_coords[i*2]
+                                       tex_coords[i*2+1] = ya + yd * mesh.texture_coords[i*2+1]
+                               end
+
+                               program.tex_coord.array(tex_coords, 2)
+                       end
+               end
 
                program.coord.array_enabled = true
                program.coord.array(mesh.vertices, 3)
@@ -295,7 +317,7 @@ class LambertProgram
                        float lambert = max(dot(light_dir, v_normal), 0.0);
 
                        if (use_map_ambient)
-                               gl_FragColor = ambient_color + texture2D(map_ambient, v_tex_coord);
+                               gl_FragColor = ambient_color * texture2D(map_ambient, v_tex_coord);
                        else
                                gl_FragColor = ambient_color;
 
@@ -303,6 +325,8 @@ class LambertProgram
                                gl_FragColor += lambert * diffuse_color * texture2D(map_diffuse, v_tex_coord);
                        else
                                gl_FragColor += lambert * diffuse_color;
+
+                       if (gl_FragColor.a < 0.01) discard;
                }
                """ @ glsl_fragment_shader