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

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;