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)

release/scripts/modules/bpy_types.py

@@ -742,7 +742,6 @@ class Gizmo(StructRNA):
             matrix = self.matrix_world
 
         batch, shader = shape
-        shader.bind()
 
         if select_id is not None:
             gpu.select.load_id(select_id)

release/scripts/modules/gpu_extras/presets.py

@@ -78,7 +78,6 @@ def draw_texture_2d(texture, position, width, height):
         gpu.matrix.scale((width, height))
 
         shader = gpu.shader.from_builtin('IMAGE')
-        shader.bind()
 
         if isinstance(texture, int):
             # Call the legacy bgl to not break the existing API

release/scripts/templates_py/operator_modal_draw.py

@@ -19,7 +19,6 @@ def draw_callback_px(self, context):
     gpu.state.blend_set('ALPHA')
     gpu.state.line_width_set(2.0)
     batch = batch_for_shader(shader, 'LINE_STRIP', {"pos": self.mouse_path})
-    shader.bind()
     shader.uniform_float("color", (0.0, 0.0, 0.0, 0.5))
     batch.draw(shader)
 

source/blender/python/gpu/gpu_py_shader.c

@@ -270,6 +270,7 @@ static PyObject *pygpu_shader_uniform_vector_float(BPyGPUShader *self, PyObject
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_shader_uniform_vector(self->shader, location, length, count, pybuffer.buf);
 
   PyBuffer_Release(&pybuffer);
@@ -292,6 +293,7 @@ static PyObject *pygpu_shader_uniform_vector_int(BPyGPUShader *self, PyObject *a
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_shader_uniform_vector_int(self->shader, location, length, count, pybuffer.buf);
 
   PyBuffer_Release(&pybuffer);
@@ -359,6 +361,7 @@ static PyObject *pygpu_shader_uniform_bool(BPyGPUShader *self, PyObject *args)
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_shader_uniform_vector_int(self->shader, location, length, 1, values);
 
   Py_RETURN_NONE;
@@ -428,6 +431,7 @@ static PyObject *pygpu_shader_uniform_float(BPyGPUShader *self, PyObject *args)
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_shader_uniform_vector(self->shader, location, length, 1, values);
 
   Py_RETURN_NONE;
@@ -499,6 +503,7 @@ static PyObject *pygpu_shader_uniform_int(BPyGPUShader *self, PyObject *args)
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_shader_uniform_vector_int(self->shader, location, length, 1, values);
 
   Py_RETURN_NONE;
@@ -522,6 +527,7 @@ static PyObject *pygpu_shader_uniform_sampler(BPyGPUShader *self, PyObject *args
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   int slot = GPU_shader_get_texture_binding(self->shader, name);
   GPU_texture_bind(py_texture->tex, slot);
   GPU_shader_uniform_1i(self->shader, name, slot);
@@ -556,6 +562,7 @@ static PyObject *pygpu_shader_uniform_block(BPyGPUShader *self, PyObject *args)
     return NULL;
   }
 
+  GPU_shader_bind(self->shader);
   GPU_uniformbuf_bind(py_ubo->ubo, binding);
 
   Py_RETURN_NONE;