PyGPU: call 'GPU_shader_bind' in 'GPUShader.uniform_' methods

This simplifies python code.

When we call a method like shader.uniform_float("color", (1,1,1,1)),
we expect the shader's uniform to be updated regardless of whether the
shader is bound or not.

And `batch.draw()` already calls `GPU_shader_bind` inside.

Differential Revision: https://developer.blender.org/D15929

doc/python_api/examples/gpu.1.py

@@ -134,7 +134,6 @@ batch = batch_for_shader(shader, 'LINES', {"pos": coords})
 
 
 def draw():
-    shader.bind()
     shader.uniform_float("color", (1, 1, 0, 1))
     batch.draw(shader)
 

doc/python_api/examples/gpu.10.py

@@ -58,7 +58,6 @@ batch = batch_for_shader(
 
 
 def draw():
-    shader.bind()
     matrix = bpy.context.region_data.perspective_matrix
     shader.uniform_float("u_ViewProjectionMatrix", matrix)
     shader.uniform_float("u_Scale", 10)

doc/python_api/examples/gpu.2.py

@@ -41,7 +41,6 @@ batch = batch_for_shader(shader, 'TRIS', {"position": coords})
 
 
 def draw():
-    shader.bind()
     matrix = bpy.context.region_data.perspective_matrix
     shader.uniform_float("viewProjectionMatrix", matrix)
     shader.uniform_float("brightness", 0.5)

doc/python_api/examples/gpu.3.py

@@ -22,7 +22,6 @@ batch = batch_for_shader(shader, 'LINES', {"pos": coords}, indices=indices)
 
 
 def draw():
-    shader.bind()
     shader.uniform_float("color", (1, 0, 0, 1))
     batch.draw(shader)
 

doc/python_api/examples/gpu.5.py

@@ -18,7 +18,6 @@ batch = batch_for_shader(shader, 'TRIS', {"pos": vertices}, indices=indices)
 
 
 def draw():
-    shader.bind()
     shader.uniform_float("color", (0, 0.5, 0.5, 1.0))
     batch.draw(shader)
 

doc/python_api/examples/gpu.6.py

@@ -56,7 +56,6 @@ batch = batch_for_shader(
 
 
 def draw():
-    shader.bind()
     shader.uniform_sampler("image", texture)
     batch.draw(shader)
 

doc/python_api/examples/gpu.7.py

@@ -76,7 +76,6 @@ batch = batch_for_shader(
 
 
 def draw():
-    shader.bind()
     shader.uniform_float("modelMatrix", Matrix.Translation((1, 2, 3)) @ Matrix.Scale(3, 4))
     shader.uniform_float("viewProjectionMatrix", bpy.context.region_data.perspective_matrix)
     shader.uniform_sampler("image", offscreen.texture_color)