Sha256: 0ae764823caab39427cbf2b8d736dbfd2e106fff5e73704aad798ff2bffbe725
Contents?: true
Size: 1.63 KB
Versions: 10
Compression:
Stored size: 1.63 KB
Contents
include_package 'java.nio'
java_import 'processing.opengl.PGL'
attr_reader :sh, :vert_loc, :color_loc, :vert_data, :color_data
def setup
size(640, 360, P3D)
# Loads a shader to render geometry w/out
# textures and lights.
@sh = loadShader("frag.glsl", "vert.glsl")
@vert_data = allocate_direct_float_buffer(12)
@color_data = allocate_direct_float_buffer(12)
end
def draw
background(0)
# The geometric transformations will be automatically passed
# to the shader.
rotate(frame_count * 0.01, width, height, 0)
update_geometry
pgl = beginPGL
sh.bind
@vert_loc = pgl.getAttribLocation(sh.glProgram, "vertex")
@color_loc = pgl.getAttribLocation(sh.glProgram, "color")
pgl.enableVertexAttribArray(vert_loc)
pgl.enableVertexAttribArray(color_loc)
pgl.vertexAttribPointer(vert_loc, 4, PGL.FLOAT, false, 0, vert_data)
pgl.vertexAttribPointer(color_loc, 4, PGL.FLOAT, false, 0, color_data)
pgl.drawArrays(PGL.TRIANGLES, 0, 3)
pgl.disableVertexAttribArray(vert_loc)
pgl.disableVertexAttribArray(color_loc)
sh.unbind
endPGL
end
def update_geometry
# Vertex 1
vertices = [0, 0, 0, 1]
colors = [1, 0, 0, 1]
# Corner 2
vertices += [width/2, height, 0, 1]
colors += [0, 1, 0, 1]
# Corner 3
vertices += [width, 0, 0, 1]
colors += [0, 0, 1, 1]
vert_data.rewind
vert_data.put(vertices.to_java :float)
vert_data.position(0)
color_data.rewind
color_data.put(colors.to_java :float)
color_data.position(0)
end
def allocate_direct_float_buffer(n)
ByteBuffer.allocateDirect(n * java.lang.Float::SIZE/8).order(ByteOrder.nativeOrder).asFloatBuffer
end
Version data entries
10 entries across 10 versions & 1 rubygems