lib/glesv2: intro `blend_func` and `depth_func`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/glesv2/glesv2.nit b/lib/glesv2/glesv2.nit
index 3e6ad1b..f7a2e64 100644 (file)
--- a/lib/glesv2/glesv2.nit
+++ b/lib/glesv2/glesv2.nit
@@ -492,6 +492,22 @@ class GLES
        # Specify the width of rasterized lines
        fun line_width(width: Float) `{ glLineWidth(width); `}
 
+       # Set the pixel arithmetic for the blending operations
+       #
+       # Defaultvalues before assignation:
+       # * `src_factor`: `GLBlendFactor::one`
+       # * `dst_factor`: `GLBlendFactor::zero`
+       fun blend_func(src_factor, dst_factor: GLBlendFactor) `{
+               glBlendFunc(src_factor, dst_factor);
+       `}
+
+       # Specify the value used for depth buffer comparisons
+       #
+       # Default value is `GLDepthFunc::less`
+       #
+       # Foreign: glDepthFunc
+       fun depth_func(func: GLDepthFunc) `{ glDepthFunc(func); `}
+
        # Set the texture minifying function
        #
        # Foreign: glTexParameter with GL_TEXTURE_MIN_FILTER
@@ -562,6 +578,47 @@ extern class GLDataType
        fun is_sampler_cube: Bool `{ return recv == GL_SAMPLER_CUBE; `}
 end
 
+# Pixel arithmetic for blending operations
+#
+# Used by `GLES::blend_func`
+extern class GLBlendFactor
+       super GLEnum
+
+       new zero `{ return GL_ZERO; `}
+       new one `{ return GL_ONE; `}
+       new src_color `{ return GL_SRC_COLOR; `}
+       new one_minus_src_color `{ return GL_ONE_MINUS_SRC_COLOR; `}
+       new dst_color `{ return GL_DST_COLOR; `}
+       new one_minus_dst_color `{ return GL_ONE_MINUS_DST_COLOR; `}
+       new src_alpha `{ return GL_SRC_ALPHA; `}
+       new one_minus_src_alpha `{ return GL_ONE_MINUS_SRC_ALPHA; `}
+       new dst_alpha `{ return GL_DST_ALPHA; `}
+       new one_minus_dst_alpha `{ return GL_ONE_MINUS_DST_ALPHA; `}
+       new constant_color `{ return GL_CONSTANT_COLOR; `}
+       new one_minus_constant_color `{ return GL_ONE_MINUS_CONSTANT_COLOR; `}
+       new constant_alpha `{ return GL_CONSTANT_ALPHA; `}
+       new one_minus_constant_alpha `{ return GL_ONE_MINUS_CONSTANT_ALPHA; `}
+
+       # Used for destination only
+       new src_alpha_saturate `{ return GL_SRC_ALPHA_SATURATE; `}
+end
+
+# Condition under which a pixel will be drawn
+#
+# Used by `GLES::depth_func`
+extern class GLDepthFunc
+       super GLEnum
+
+        new never `{ return GL_NEVER; `}
+        new less `{ return GL_LESS; `}
+        new equal `{ return GL_EQUAL; `}
+        new lequal `{ return GL_LEQUAL; `}
+        new greater `{ return GL_GREATER; `}
+        new not_equal `{ return GL_NOTEQUAL; `}
+        new gequal `{ return GL_GEQUAL; `}
+        new always `{ return GL_ALWAYS; `}
+end
+
 # Set of buffers as a bitwise OR mask, used by `GLES::clear`
 #
 # ~~~