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"""
Advanced Graphics Pipeline for Virtual GPU
Integrated with Helium VGPU Pipeline
Stages: Rasterization, Clipping, Blending, Depth/Stencil Testing
"""
import numpy as np
from helium.core.pipeline import VGPUPipeline
from helium.core.memory import MemoryPool
class VGPURasterizer:
def __init__(self, vgpu_pipeline, memory_pool):
self.pipeline = vgpu_pipeline
self.memory_pool = memory_pool
self.stream_id = self.pipeline.create_stream()
def rasterize(self, vertices, indices, viewport, width, height):
# Allocate vertex and index buffers in VGPU memory
vertex_addr = self.memory_pool.allocate_tensor(
shape=(len(vertices), 3),
dtype=np.float32,
stream_id=self.stream_id
)
index_addr = self.memory_pool.allocate_tensor(
shape=(len(indices),),
dtype=np.int32,
stream_id=self.stream_id
)
# Use VGPU for triangle setup and rasterization
fragments = self.pipeline.execute_kernel(
"rasterize_triangles",
inputs={
"vertices": vertex_addr,
"indices": index_addr,
"viewport": viewport,
"dimensions": (width, height)
},
stream_id=self.stream_id
)
fragments = []
for y in range(min_y, max_y+1):
for x in range(min_x, max_x+1):
bc = self.barycentric(tri, (x, y))
if all(b >= 0 for b in bc):
z = sum(bc[i]*tri[i][2] for i in range(3))
fragments.append((x, y, z, bc, tri_idx))
return fragments
def barycentric(self, tri, p):
# Compute barycentric coordinates for point p in triangle tri
a, b, c = tri
denom = ((b[1] - c[1])*(a[0] - c[0]) + (c[0] - b[0])*(a[1] - c[1]))
if denom == 0:
return (-1, -1, -1)
w0 = ((b[1] - c[1])*(p[0] - c[0]) + (c[0] - b[0])*(p[1] - c[1])) / denom
w1 = ((c[1] - a[1])*(p[0] - c[0]) + (a[0] - c[0])*(p[1] - c[1])) / denom
w2 = 1 - w0 - w1
return (w0, w1, w2)
def in_viewport(self, v, viewport):
x, y, _ = v
x0, y0, x1, y1 = viewport
return x0 <= x <= x1 and y0 <= y <= y1
class Clipper:
def clip(self, triangles, clip_rect):
# For demo: trivial reject if all verts outside
clipped = []
for tri in triangles:
if any(self.in_clip(v, clip_rect) for v in tri):
clipped.append(tri)
return clipped
def in_clip(self, v, clip_rect):
x, y, _ = v
x0, y0, x1, y1 = clip_rect
return x0 <= x <= x1 and y0 <= y <= y1
class Blender:
def blend(self, src_color, dst_color, mode='alpha', alpha=1.0):
if mode == 'alpha':
return alpha * src_color + (1 - alpha) * dst_color
elif mode == 'add':
return np.clip(src_color + dst_color, 0, 1)
elif mode == 'multiply':
return src_color * dst_color
else:
return src_color
class DepthStencil:
def __init__(self, width, height):
self.depth = np.full((height, width), np.inf, dtype=np.float32)
self.stencil = np.zeros((height, width), dtype=np.uint8)
def test(self, x, y, z, stencil_ref=1):
# Depth test: less
if z < self.depth[y, x]:
self.depth[y, x] = z
self.stencil[y, x] = stencil_ref
return True
return False
def clear(self, depth_val=np.inf, stencil_val=0):
self.depth.fill(depth_val)
self.stencil.fill(stencil_val)
from .texture_buffer_manager import Texture, Buffer, Framebuffer
class GraphicsPipeline:
def __init__(self, width, height, num_framebuffers=1, channels=4):
self.rasterizer = Rasterizer()
self.clipper = Clipper()
self.blender = Blender()
self.depth_stencil = DepthStencil(width, height)
self.framebuffer = Framebuffer(width, height, num_targets=num_framebuffers, channels=channels)
self.textures = {}
self.buffers = {}
self.active_texture = None
self.active_vertex_buffer = None
self.active_index_buffer = None
def upload_texture(self, name, img):
h, w, c = img.shape
tex = Texture(w, h, c, img.dtype)
tex.upload(img)
self.textures[name] = tex
def bind_texture(self, name):
self.active_texture = self.textures[name]
def sample_texture(self, u, v):
if self.active_texture is not None:
return self.active_texture.sample(u, v)
return None
def upload_vertex_buffer(self, name, data):
self.buffers[name] = Buffer(data)
def bind_vertex_buffer(self, name):
self.active_vertex_buffer = self.buffers[name]
def upload_index_buffer(self, name, data):
self.buffers[name] = Buffer(data)
def bind_index_buffer(self, name):
self.active_index_buffer = self.buffers[name]
def bind_framebuffer(self, idx=0):
self.framebuffer.bind(idx)
def clear_framebuffer(self, color=0):
self.framebuffer.clear(color)
def run(self, viewport, clip_rect, blend_mode='alpha', alpha=1.0, shader_program=None):
# Use bound vertex/index buffers
vertices = self.active_vertex_buffer.get()
indices = self.active_index_buffer.get()
width, height = self.framebuffer.width, self.framebuffer.height
# 1. Rasterization
fragments = self.rasterizer.rasterize(vertices, indices, viewport, width, height)
# 2. Clipping (fragments outside clip_rect)
x0, y0, x1, y1 = clip_rect
fragments = [f for f in fragments if x0 <= f[0] <= x1 and y0 <= f[1] <= y1]
# 3. Depth/Stencil Test and Fragment Processing
for frag in fragments:
x, y, z, bary, tri_idx = frag
if not (0 <= x < width and 0 <= y < height):
continue
if not self.depth_stencil.test(x, y, z):
continue
# 4. Fragment shading (with texture sampling if needed)
if shader_program is not None:
color = shader_program.run_fragment(bary, tri_idx, vertices, self.active_texture)
else:
color = np.ones(4) # Default white
# 5. Blending
prev = self.framebuffer.read(x, y)
out = self.blender.blend(color, prev, mode=blend_mode, alpha=alpha)
self.framebuffer.write(x, y, out)
return self.framebuffer.targets
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